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Semi-coherent and coherent nanoprecipitation induced superior strength-ductility combination in additively manufactured CoCrMoW alloy

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Journal of materials science & Technology 2026年 242卷 1-14页

作者： Canjuan Xiao Weijin Cai Ruidi Li Song Ni Wenting Jiang Zhangwei Wang Khurram Yaqoob Zibin Chen Yi Huang Min Song State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China College of Materials and Advanced Manufacturing Hunan University of Technology Zhuzhou 412007 China School of Chemical and Materials Engineering National University of Sciences and Technology H-12 Islamabad Pakistan Research Institute for Advanced Manufacturing Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong 999077 China Department of Design and Engineering Faculty of Science and Technology Bournemouth University Poole Dorset BH12 5BB UK Materials Research Group Department of Mechanical Engineering University of Southampton Southampton SO17 1BJ UK

The interface coherence between precipitates and the matrix—whether coherent, semi-coherent, or incoherent—significantly impacts both the strength and ductility of metallic materials. An optimal balance between these properties can be achieved through manipulation of the precipitate/matrix interface. In this study, 1 wt.% and 2 wt.% TiN nanoparticles were introduced into a laser powder bed fusion (LPBF) fabricated CoCrMoW alloy as a reinforcing phase. Compared to the unreinforced alloy, the alloy with 1 wt.% TiN exhibited substantial improvements in yield strength, ultimate tensile strength, and fracture elongation, increasing from 876 MPa, 1190 MPa, and 15 % to 1071 MPa, 1421 MPa, and 17 %, respectively. Although the addition of TiN nanoparticles did not significantly affect the average grain size, it inhibited the formation of fine grains at the fusion line and influenced the overall grain size distribution. More importantly, the incorporation of TiN nanoparticles during the LPBF process led to the in-situ formation of semi-coherent precipitates rich in Ti and N, as well as coherent precipitates rich in Ti, N, and O. The semi-coherent precipitates, which exhibit well-defined orientation relationships and periodic misfit dislocations, enhanced strength by blocking stacking faults and ε laths. They also preserved plasticity by promoting self-relaxation through twinning at intersected areas, thus preventing crack nucleation at the interface. Furthermore, the chemical inhomogeneity between the coherent phase and the matrix increased resistance to dislocation cutting of the precipitates, thereby improving the material’s strength without compromising ductility.

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Improvement of corrosion resistance and heat dissipation of Mg-6%Al-4%Ca alloy by the addition of Mn, Mm, and the surface treatment

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第12期73卷 646-650页

作者： Ito, Mizuki Kondo, Natsuki Kirimoto, Yuichi Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama Toyama-shi Japan Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama Toyama Toyama-shi Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama Toyama-shi Japan CHUETSU METAL WORKS CO LTD.. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Toyama Imizu-shi Japan

With the recent digitization, electronic equipment housings are required to be thin-walled and have rigidity, heat dissipation, corrosion resistance, and electromagnetic shielding properties. Magnesium alloys are promising materials that satisfy these requirements. Mg-Al alloys have good castability and high strength, but their thermal conductivity decreases. In general, adding alloying elements to magnesium decreases thermal conductivity the effect of aluminum addition is significant. It was found that adding calcium to Mg-Al alloys to form Mg-Al-Ca (AX) alloys results in higher thermal conductivity than that of Mg-Al alloys. However, AX alloys have poor corrosion resistance and require post-treatment such as surface treatment. In this study, AX64, which has high thermal conductivity among the AX series alloys, was used as the basic composition, and corrosion resistance was improved by adding manganese and misch metal, and an attempt was made to improve corrosion resistance and emissivity through surface treatment. The change in thermal conductivity by heat treatment was also investigated. Experimental results showed that the addition of manganese and misch metal improved corrosion resistance and thermal conductivity. Plasma anodization also improved corrosion resistance and emissivity. Heat treatment of these alloys at 400°C improved the thermal conductivity with longer holding time. © 2023 The Japan Institute of Light Metals.

关键词： Corrosion resistance

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Investigating the impact of metal ion variations in terephthalate metal–organic frameworks on the organic solvent nanofiltration performance of mixed matrix membranes

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Journal of Membrane science 2024年 700卷

作者： Ajebe, Eyasu Gebrie Hu, Chien Chieh Lugito, Graecia Hu, Chun-Po Hung, Wei-Song Lee, Kueir-Rarn Lai, Juin-Yih Graduate Institute of Applied Science and Technology Advanced Membrane Materials Research Center National Taiwan University of Science and Technology Taipei Taiwan Chemical Engineering Study Program Faculty of Industrial Technology Institut Teknologi Bandung West Java Indonesia Nanyang Technological University 1 Cleantech Loop Singapore R&D Center for Membrane Technology Chung Yuan University Chungli Taoyuan Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chungli Taoyuan Taiwan

Nano-fillers integrated into mixed matrix membranes (MMMs) present promising alternatives for organic solvent nanofiltration (OSN). In this work, our objective is to enhance OSN performance by incorporating terephthalate metal-organic frameworks (M-BDC, where M = Zr or Cu) into a P84 matrix to fabricate M-BDC/P84 composite MMMs. This work focuses on the influence of metal cluster variation on particle size, pore size distribution, and specific surface area of M-BDC, while systematically investigating the impact of M-BDC addition on OSN performance and underlying separation mechanisms. The synthesized membranes underwent comprehensive characterization using SEM, XRD, ATR-FTIR, contact angle, zeta potential, and thermogravimetric analysis. Significantly, all MMMs exhibited superior permeance and methyl blue (MB) rejection compared to P84 membranes. This enhancement is attributed to the improved interfacial contact between M-BDC and P84, as well as their effective dispersion within the membrane matrix. Interestingly, comparative analysis between Cu-BDC/P84 and Zr-BDC/P84 MMMs revealed the latter's superior permeance, attributed to its larger pore size and surface area. The resulting MMMs demonstrated outstanding MB rejection (>96.7%) with ethanol permeance of 21.5 and 19.0 LMH/Bar for Zr-BDC/P84 and Cu-BDC/P84 MMMs, respectively. Furthermore, the stable performance of M-BDC-based MMMs during prolonged MB/ethanol operation underscores their potential significance in the field of OSN, providing valuable insights for future membrane design and application. © 2024 Elsevier B.V.

关键词： Organometallics

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Identification of Polypyrrole-Encapsulated BiSCl as a Novel and Viable Conversion/Alloying Anode Material for High-Performance Lithium Storage

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SSRN 2024年

作者： Li, Sen Huang, Zhiyuan Hua, Yingkai Liu, Xingchen Chen, Xi Feng, Qi Feng, Jun Department of Materials Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Department of Industrial Systems Engineering The Hong Kong Polytechnic University 100872 Hong Kong Department of Pharmacology Graduate School of Medicine Kagawa University 1750-1 Takamatsu761-0793 Japan Department of Advanced Materials Science Faculty of Engineering and Design Kagawa University 2217-20 Takamatsu761-0396 Japan Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology Guangdong Shenzhen518055 China Institute for Quantum Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China

Anode materials combining conversion and alloying mechanisms are increasingly valued in advanced rechargeable batteries for their exceptional theoretical capacities and advantageous working voltages. This study showcases BiSCl as a novel conversion/alloying anode material, demonstrating a high specific capacity and enhanced durability through polypyrrole encapsulation. Employing in-situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ex-situ transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM), we offer a detailed analysis of the lithiation mechanism in BiSCl. The anode exhibits a low average working potential of approximately 0.6 V, supporting a theoretical specific capacity of 784 mAh g−1 and a volumetric capacity of 4664 mAh cm−3. The innovative BiSCl-PPy core-shell composite effectively addresses the challenges of volumetric expansion and polysulfide dissolution. This composite delivers a remarkable reversible capacity of 753 mAh g–1 at a current rate of 100 mA g−1, maintaining 96% of its specific capacity over 400 cycles, and sustains 419 mAh g–1 at 500 mA g−1 after 800 cycles, demonstrating more superior performance than that of BiSCl. These findings establish BiSCl as a highly promising conversion/alloying anode material for lithium storage, significantly enhanced in durability by the BiSCl-PPy core-shell composite. © 2024, The Authors. All rights reserved.

关键词： Anodes

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Nitrogen-Doping Induced Local Chemical Heterogeneity and the Enhanced Mechanical Properties In Cocrmow Alloys Manufactured Via Laser Powder Bed Fusion

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SSRN 2024年

作者： Jiang, Wenting Li, Ruidi He, Junyang Ni, Song Wang, Li Chen, Zibin Huang, Yi Li, Caiju Yi, Jianhong Song, Min State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Research Institute for Advanced Manufacturing Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong Department of Design and Engineering Faculty of Science and Technology Bournemouth University Poole DorsetBH12 5BB United Kingdom Materials Research Group Department of Mechanical Engineering University of Southampton SouthamptonSO17 1BJ United Kingdom Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China

CoCrMoW alloys with different nitrogen (N) additions (0, 0.05, 0.1 and 0.2 wt.%) were prepared via laser powder bed fusion (LPBF). The effects of N content on the microstructure and mechanical properties were investigated. The results indicate that the LPBFed CoCrMoW alloy with 0.1 wt.% N addition (0.1N alloy) shows the best combination of mechanical properties with a yield strength of ~ 983 MPa and an elongation of ~ 19%. Both the LPBF process and the N addition impose great effects on suppressing the γ to Ε martensitic transformation, resulting in a decrease in the width and amount of Ε laths/stacking faults. Besides, the N addition promotes the segregation of elements Mo, W, and Si along the cellular sub-grain boundaries (CBs), forming fine and discontinuous precipitates rich in Mo, W and Si along the CBs in the 0.1N alloy, but dense and continuous (Mo,W)5Si3 precipitates along the CBs in the 0.2N alloy. The (Mo,W)5Si3 precipitates with a tetragonal structure were observed and characterized for the first time in the Co-Cr based alloys. The negative mixing enthalpy between the non-metallic elements N, Si and the metallic elements Mo, W, Cr, and the rapid solidification induced segregation of high melting point elements such as Mo and W along CBs during LPBF process, synergistically contribute to the chemical heterogeneity in the alloys. The pure FCC matrix, the slightly increased segregation of Mo, W, Si elements and fine precipitates along the CBs contribute to the good combination of strength and elongation of the 0.1N alloy. However, though pure FCC phase was present in the 0.2N alloy, the dense and continuous (Mo,W)5Si3 precipitates along CBs acted as nucleation sites for cracks, deteriorating the elongation of the alloy. Overall, it is possible to tune the mechanical properties of the LPBFed CoCrMoW alloy by adjusting the local chemical heterogeneity. © 2024, The Authors. All rights reserved.

关键词： Chromium alloys

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Nitrogen-Doping Assisted Local Chemical Heterogeneity and Mechanical Properties In Cocrmow Alloys Manufactured Via Laser Powder Bed Fusion

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SSRN 2024年

CoCrMoW alloys with different nitrogen (N) additions (0, 0.05, 0.1 and 0.2 wt.%) were prepared via laser powder bed fusion (LPBF). The effects of N content on the microstructure and mechanical properties were investigated. The results indicate that the LPBFed CoCrMoW alloy with 0.1 wt.% N addition (0.1N alloy) shows the best combination of mechanical properties with a yield strength of ~ 983 MPa and an elongation of ~ 19%. Both the LPBF process and the N addition impose great effects on suppressing the g to e martensitic transformation, resulting in a decrease in the width and amount of e laths/stacking faults. Besides, the N addition promotes the segregation of elements Mo, W, and Si along the cellular sub-grain boundaries (CBs), forming fine and discontinuous precipitates rich in Mo, W and Si along the CBs in the 0.1N alloy, but dense and continuous (Mo,W)5Si3 precipitates along the CBs in the 0.2N alloy. The (Mo,W)5Si3 precipitates with a tetragonal structure were observed and characterized for the first time in the Co-Cr based alloys. The negative mixing enthalpy between the non-metallic elements N, Si and the metallic elements Mo, W, Cr, and the rapid solidification induced segregation of high melting point elements such as Mo and W along CBs during LPBF process, synergistically contribute to the chemical heterogeneity in the alloys. The pure FCC matrix, the slightly increased segregation of Mo, W, Si elements and fine precipitates along the CBs contribute to the good combination of strength and elongation of the 0.1N alloy. However, though pure FCC phase was present in the 0.2N alloy, the dense and continuous (Mo,W)5Si3 precipitates along CBs acted as nucleation sites for cracks, deteriorating the elongation of the alloy. Overall, it is possible to tune the mechanical properties of the LPBFed CoCrMoW alloy by adjusting the local chemical heterogeneity. © 2024, The Authors. All rights reserved.

关键词： Chromium alloys

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Structural, Optical, and Electrical Properties of Multi-Component P-Type Oxide-Semiconductor Cu-Mn-Sn-O Thin Films

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SSRN 2024年

作者： Nguyen Quoc Trinh, Bui Dinh, The Nam Vietnam National University Hanoi University of Science Faculty of Physics 334 Nguyen Trai Thanh Xuan Hanoi Viet Nam Tokyo Institute of Technology School of Materials and Chemical Technology Department of Materials Science and Engineering 2-12-1 Okayama Meguro Tokyo152-8550 Japan Vietnam National University Hanoi Vietnam Japan University Faculty of Advanced Technology and Engineering Nanotechnology Program Luu Huu Phuoc Nam Tu Liem Hanoi Viet Nam

P-type oxide semiconductors as a conducting channel layer have attracted huge attention owing to wide applications in electronic devices. In this study, multi-component oxide-semiconductor Cu1-2xMnxSnxO thin films with x = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, and 0.33 were successfully prepared on glass substrates, by using a solution process accompanied with a spin-coating technique. One obtained that, a phase transition between the CuO monoclinic structure and the rock salt structure was observed when leveling up the concentration of Mn and Sn, simultaneously to descending the concentration of Cu in the precursors. The crystallite size was found to decrease throughout the samples, with a minimum value of 9.8 nm towards the equimolar ratio. The scanning electron microscope confirmed further the downward tendency as mentioned above, and indicated an improvement in the film surfaces as well. According to the optical absorption measurement, the bandgap energy was determined to be in a range from 2.68 eV to 3.44 eV. Interestingly, the sheet resistance of Cu1-2xMnxSnxO films witnessed a sharp drop from 5.24 kΩ/sq of CuO to 0.034 kΩ/sq at the film with the molar ratio Cu:Mn:Sn being 34:33:33. © 2024, The Authors. All rights reserved.

关键词： Crystallite size

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Experimental Investigation and Validation of Strength-Based Topology and Fiber Path Optimization in Continuous Fiber Reinforced Composites

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SSRN 2024年

作者： Yap, Timothy He, Zhelong Wang, Zhichao Tamijani, Ali Tehrani, Mehran Department of Structural Engineering University of California San Diego La Jolla CA92093 United States Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States State-Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China

Material Extrusion (ME) based Fused Filament Fabrication (FFF) excels with Continuous Carbon Fiber (CCF) reinforced filaments. This Additive Manufacturing (AM) technology allows for intricate parts to be made with topologies where fibers are aligned in directions that optimize strength and stiffness, albeit within certain manufacturing limitations. This study investigates the performance of strength-based optimization methods applied to two benchmark structural domains and loading scenarios. Two methods were used to concurrently design the topology and fiber paths: shape optimization using the level-set method, and topology optimization using both density-based Solid Orthotropic Material with Penalization (SOMP) and level-set methods. CCF filaments were printed to follow the post-processed fiber paths, and a discontinuous fiber reinforced filament was used to fill in the remaining gaps. The parts were then compression molded for full consolidation, followed by testing for their stiffness and strengths (failure loads). Finite Element Analysis (FEA) was used to simulate the stiffness and failures of the tested parts. FEA predicted stiffnesses, locations of failure, and failure loads with reasonable accuracy (less than 10% difference with experiment). A micro-computed tomography (µCT) examination of failed coupons showed that fiber flow (deviation from printed paths) during compression molding was a major source of error. In one case, a progressive damage failure model performed more accurately than a linear static simulation. Finally, comparing designs optimized for stiffness versus strength showed premature failures due to stress concentrations in stiffness-optimized designs. This study underscores the critical need for integrating proper optimization strategy with realistic AM constraints to enhance the performance and reliability of CFF reinforced AM parts. © 2024, The Authors. All rights reserved.

关键词： Finite element method

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Exploring the internal textures and physical properties of digitate sinter in hot springs: Implications for remote sampling on Mars

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Planetary and Space science 2023年 238卷

作者： Nersezova, Ema E. Rowe, Michael C. Campbell, Kathleen A. Ang, Andrew Matthews, Steve Ruff, Steven W. Meghwal, Ashok Adam, Ludmila Galligan, Niamh Loho, Thomas School of Environment Faculty of Science The University of Auckland Auckland1010 New Zealand Te Ao Mārama – Centre for Fundamental Inquiry Faculty of Science The University of Auckland Auckland1010 New Zealand Department of Mechanical Engineering and Product Design Engineering Faculty of Science Engineering and Technology "Surface Engineering for Advanced Materials"- SEAM Swinburne University of Technology H38 P.O. Box 218 HawthornVIC3122 Australia Department of Chemical and Materials Engineering University of Auckland Auckland1010 New Zealand School of Earth and Space Exploration Arizona State University TempeAZ85287 United States

Hydrothermal silica deposits on the surface of Mars with textures analogous to terrestrial hot spring deposits are, arguably, one of the best potential targets in the search for evidence of life beyond Earth. Here we investigate terrestrial hot spring digitate silica structures (modern: El Tatio, Chile;Mars Pool at Rotokawa geothermal area, and Te Kopia thermal stream, New Zealand;1.6–1.8 ka: Opal Mound, Utah, U.S.A.), which are texturally and mineralogically analogous to martian deposits in the Columbia Hills of Gusev crater, in order to elucidate how their physical properties vary with depositional environment, and to help guide future remote sampling endeavors. Micro-computed tomography allows visualization of the internal texture of geological materials through variations in porosity and relative density, and is demonstrated here as a key, non-invasive technique for investigating future returned planetary samples. Bulk porosity, associated with pore sizes greater than >1–2 μm, varies from 4.7 to 21.3% in the four studied terrestrial digitate sinter samples, representing a range of fluid pHs of formation. Moreover, density variations between laminae largely reflect a nano-scale porosity (6 GPa (Opal Mound). Regions of nano-porous silica in all samples reduces the hardness in these areas to © 2023 The Authors

关键词： Textures

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Multi-Material Topology Optimization of Structures Using an Ordered Ersatz Material Model

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Computer Modeling in engineering & sciences 2021年第8期128卷 523-540页

作者： Baoshou Liu Xiaolei Yan Yangfan Li Shiwei Zhou Xiaodong Huang Fujian Key Laboratory of Automotive Electronics and Electric Drive Fujian University of TechnologyFuzhou350118China Key Laboratory of Advanced Technology for Vehicle Body Design&Manufacture Hunan UniversityChangsha410082China Faculty of Science Engineering and TechnologySwinburne University of TechnologyMelbourneVIC 3122Australia Centre for Innovative Structures and Materials School of EngineeringRMIT UniversityMelbourneVIC 3001Australia

This paper proposes a new element-based multi-material topology optimization algorithm using a single variable for minimizing compliance subject to a mass constraint.A single variable based on the normalized elemental density is used to overcome the occurrence of meaningless design variables and save computational *** from the traditional material penalization scheme,the algorithm is established on the ordered ersatz material model,which linearly interpolates Young’s modulus for relaxed design *** achieve a multi-material design,the multiple floating projection constraints are adopted to gradually push elemental design variables to multiple discrete *** the convergent element-based solution,the multiple level-set functions are constructed to tentatively extract the smooth interface between two adjacent *** 2D and 3D numerical examples are presented to demonstrate the effectiveness of the proposed algorithm and the possible advantage of the multi-material designs over the traditional solid-void designs.

关键词： Multi-material topology optimization ordered ersatz material model mass constraint single variable

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