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Origin of strong solid solution strengthening in the CrCoNi-W medium entropy alloy

Journal of Materials Science & technology 2021年第14期73卷 101-107页

作者： Yujie Chen Yan Fang Xiaoqian Fu Yiping Lu Sijing Chen Hongbin Bei Qian Yu Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Superalloy Science and Technology School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Solid solution strengthening is one of the most conventional strategies for optimizing alloys strength,while the corresponding mechanisms can be more complicated than we traditionally thought specifically as heterogeneity of microstructure is *** this work,by comparing the change of chemical distribution,dislocation behaviors and mechanical properties after doping equivalent amount of tungsten(W)atoms in CrCoNi alloy and pure Ni,respectively,it is found that the alloying element W in CrCoNi alloy resulted in much stronger strengthening effect due to the significant increase of heterogeneity in chemical distribution after doping trace amount of *** large atomic scale concentration fluctuation of all elements in CrCoNi-3W causes dislocation motion via strong nanoscale segment detrapping and severe dislocation pile up which is not the case in *** results revealed the high sensitivity of elements distribution in multi-principle element alloys to composition and the significant consequent influence in tuning the mechanical properties,giving insight for complex alloy design.

关键词： Medium entropy alloy Chemical distribution heterogeneity Alloying effect Solid solution strengthening mechanism In situ observation

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Micro Hierarchical Structure and Mechanical Property of Sparrow Hawk (Accipiter nisus) Feather Shaf

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Computer Modeling in Engineering & Sciences 2021年第5期127卷 705-720页

作者： Yichen Lu Zongning Chen Enyu Guo Xiangqing Kong Huijun Kang Yanjin Xu Rengeng Li Guohua Fan Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China School of Civil Engineering Liaoning University of TechnologyJinzhou121001China AVIC Manufacturing Technology Institute Beijing100024China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing211816China

In this study,the real 3D model of the feather shaft that is composed of medulla and cortex is characterized by X-ray computer tomography,and the structural features are quantitatively *** and tensile tests are conducted to evaluate the mechanical performance of the feather shaft and cortex at different *** analysis of the 3D model shows that the medulla accounts for∼70%of the shaft volume and exhibits a closed-cell foam-like structure,with a porosity of 59%.The cells in the medulla show dodecahedron and decahedron morphology and have an equivalent diameter of∼30μ*** axial compression,the presence of medulla enhances the shaft ***,the combined effect of the medulla and cortex increases the buckling strength of the middle and distal shaft by 77%and 141%,respectively,compared to the calculated value of the shaft using linear mixed *** tensile properties of the cortex along the shaft axis are anisotropic because of the different fiber *** the fiber orientation gradually becomes uniform in the axial direction,the Young’s modulus and tensile strength of the cortex on the dorsal gradually increase from calamus to the distal shaft,and the fracture mode changes from tortuous fracture to V-shaped *** cortex on the lateral shows the opposite trend,that is the distal shaft becomes weaker due to fiber tangles.

关键词： Biomechanics feather shaft structure mechanical properties tomography

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The Effects of Different Strengthening Treatments on Wear Performance of Zl109 Aluminum Alloy at High Temperature

SSRN

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SSRN 2024年

作者： Sun, Weitao Wu, Ning Shao, Xuqi Wang, Bin Zhang, Jian College of Mechatronics Engineering Shandong University of Aeronautics Binzhou256600 China Key Laboratory of Solidification Control and Digital Preparation Technology Dalian University of Technology Dalian116085 China Binzhou Ecological Environment Service Center Binzhou256600 China

The wear resistance of ZL109 aluminum alloy as engines piston materials usually decreases with elevated temperature. Improving mechanical properties is widely appreciated, but the deteriorative trend at high temperature is inevitable. In terms of the performance between different strengthening treatments and corresponding deteriorative mechanisms, limited information is available. Herein, three strengthening methods (structural refinement, strain hardening, and precipitation strengthening) were employed to obtain similar hardness level in this study;and the main emphases were focused on their wear behavior at high temperature. The experimental results showed that wear mechanisms could transform from abrasion to adhesion with temperature, and slight oxidative wear as well. Among them, the precipitation strengthening method performed best due to the relative higher deformation resistance during sliding. It was attributed to the precipitation phase which could maintain higher dislocation density by pinning. © 2024, The Authors. All rights reserved.

关键词： Wear resistance

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Modification of detrimental π-Fe phase in Al-7Si-0.6Mg alloy

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Journal of Materials Science & technology 2026年 240卷 313-322页

作者： Jietao Feng Canfeng Fang Rong Wang Yuanjiang Tu Xiao Feng Wu Gao Min Liu Yingmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Hubei Sanjiang Aerospace Wanfeng Technology Development Co. Ltd Xiaogan 432100 China Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Ministry of Education) School of Materials Science and Engineering Dalian University of Technology Dalian 116023 China

The regulation of the detrimental π-Fe phase has been the primary concern in Al-7Si-Mg cast alloys. In this work, a two-stage solution treatment is conducted for the complete dissolution of the Mg 2 Si phase in the low-temperature stage and for manipulating the decomposition of the π-Fe phase in the high-temperature stage. This approach allows for a systematic investigation into the effect of solution temperature on the decomposition behavior of the π-Fe (Al 8 Mg 3 FeSi 6 ) phase while avoiding incipient melting. The coarse π-Fe particles form an interconnected and branched structure in the as-cast microstructure, wrapping the α -Al dendritic arms and isolating the α -Al grains. The π-Fe structure underwent subtle change during the solution treatment at 540 °C. At the elevated solution temperature of 560 °C, the π-Fe phase decomposed into a fine β -Fe phase, accompanied by particle fragmentation and shape change into the granular form. The modification of the π-Fe phase has achieved a simultaneous enhancement in the strength and ductility of the alloy.

关键词： Aluminum alloy π-Fe phase Solution treatment Modification Mechanical properties

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Ultrahigh electrical conductivities and low lattice thermal conductivities of La,Dy,and Nb Co-doped SrTiO3 thermoelectric materials with complex structures

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Journal of Materials Science & technology 2020年第17期52卷 172-179页

作者： Daquan Liu Yanxia Wang Xue Jiang Huijun Kang Xiong Yang Xiaoying Zhang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Key Laboratory of Material Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian116024China

Microstructural modifications and appropriate element doping are necessary to simultaneously enhance the electrical conductivities and reduce the lattice thermal conductivities of thermoelectric ***,we propose a strategy of multielement doping combined with a burial sintering process to promote thermoelectric ***-element doped Sr0.9La0.05Dy0.05Ti1-xNbxO3(x=0,0.05,0.10,0.15,and 0.20)powders were synthesized by high-energy ball milling,and corresponding bulk samples were prepared by carbon burial *** the bulk samples,we obtained the desired microstructures composed of shell-vesicular architectures with dense dislocations and second phase *** materials had ultrahigh electrical conductivities(~5300 S cm^-1 at 300 K),low lattice thermal conductivities(~1.6 Wm^-1 K^-1 from 700 to 1100 K when x=0.2)and low total thermal conductivities(minimum value of 2.95 Wm^-1 K^-1 when x=0.05 at 1100 K).The maximum zT values were 0.28 when x=0.05 and 0.27 when x=0.2 at 1100 *** strategy provides a possible direction for improving the thermoelectric properties of SrTiO3 based materials.

关键词： Strontium titanate Mechanical alloying Thermoelectric material Dense dislocation Sintering process

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Effect of Ti content on microstructure and properties of TixZrVNb refractory high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1318-1325页

作者： Tian-dang Huang Shi-yu Wu Hui Jiang Yi-ping Lu Tong-min Wang Ting-ju Li Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China

This study aimed to investigate the microstructure and mechanical properties of TixZrVNb(x=1,1.5,2)refractory high-entropy alloys at room and elevated *** TiZrVNb alloy consisted of the body-centered cubic(bcc)matrix with a small amount of V2Zr *** Ti1.5ZrVNb and Ti2ZrVNb alloys exhibited a single-phase bcc *** room temperature,the tensile ductility of the as-cast alloys increased from 3.5%to 12.3%with the increase in the Ti *** TixZrVNb alloys exhibited high yield strength at 600°C,and the ultimate yield strength was more than 900 *** occurred at 800°C,but the ultimate yield strength could still exceed 200 ***,the TixZrVNb alloys displayed low densities but high specific yield strengths(SYSs).The lowest density of TixZrVNb alloys was only 6.12 g/cm^3,but the SYS could reach about 180 MPa·cm^3·g^−1,which is better than those of most reported high-entropy alloys(HEAs).

关键词： high-entropy alloys mechanical properties low density elevated temperature

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preparation of heavy-section ductile iron with improved mechanical properties through quenching and tempering

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International Journal of Materials Research 2021年第5期111卷 385-391页

作者： Tong, Lifeng Zou, Qingchuan Jie, Jinchuan Li, Tingju Wang, Zhixin Key Laboratory of Solidification Control and Digital Preparation Technology School of Material Science and Engineering Dalian University of Technology Dalian China

In order to prepare heavy-section ductile iron with high strength and excellent elongation, a series of quenching-tempering experiments was conducted. A relationship between quenching-tempering time and temperature and the contents of martensite and pearlite was established by adjusting different quenching mediums and process parameters, and different microstructures in the iron matrix led to different mechanical properties. The content of martensite in the iron matrix reached over 94% after quenching at 880°C or a higher temperature. Further, the pearlite content could reach over 91% after tempering at 570°C or a higher temperature, thus resulting in improved mechanical properties. The investigated ductile iron yielded mechanical properties of a tensile strength of 970 MPa and an elongation of 6% after quenching in water at 880°C and tempering at 570°C. This will provide more possibilities for the application of heavy-section ductile iron parts. © 2020 Carl Hanser Verlag, München.

关键词： Pearlite

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Are Janus MoSSe/Ti3C2-Mxene Heterostructures Excellent Anode Materials for Na-Ion Batteries? A Computational Insight Combined Experiment

SSRN

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SSRN 2022年

作者： Zhang, Wenshu Jin, Xin Qu, Jianping Liu, Siyang Hu, Fangyuan Wang, Xudong Huang, Hao Yao, Man School of Materials Science and Engineering Dalian University of Technology Dalian116024 China Key Laboratory of Solidification Control and Digital Preparation Technology Dalian University of Technology Liaoning Province Dalian116024 China

The heterostructures composed of transition-metal dichalcogenides and MXene show excellent performance as Na-ion batteries anodes. Herein, the electrochemical performance of MoSe 2 /MXene is verified to be better than that of MoS 2 /MXene through experiments. Thereafter, first-principles calculations on electronic properties and electrochemical performances of MoSSe/MXene, MoSeS/MXene, MoSe 2 /MXene and MoS 2 /MXene are all performed to investigate Janus heterostructures’ feasibility as anodes. Diffusion barrier of MoSSe/MXene is slightly higher than that of MoSe 2 /MXene. Moreover, calculations of electronic properties reveal that the conductivity of the heterostructures is mainly provided by MXenes. Especially when the Se is connected with MXene, the conductivities of corresponding heterostructures are better as shown by MoSSe/MXene, followed by MoSe 2 /MXene. Then from crystal orbital Hamilton population, the strength of O-Na is proportional to that of S/Se-Na. Finally, MoSSe/Ti 3 C 2 -MXene possesses lower open circuit voltage (1.538 V) and higher theoretical capacity (593.3 mAh/g) than MoSe 2 /Ti 3 C 2 -MXene according to calculation results, which is more suitable for Na-ion batteries anodes. While overall performance tests show that MoSeS/MXene does not perform well. This work provides evidence to realize potential of Janus heterostructures as anodes for Na-ion batteries. © 2022, The Authors. All rights reserved.

关键词： Density functional theory

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Magnetic transformation of Mn from anti-ferromagnetism to ferromagnetism in FeCoNiZMn_(x)(Z=Si,Al,Sn,Ge)high entropy alloys

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Journal of Materials Science & technology 2021年第9期68卷 124-131页

作者： Bin Zhang Yuping Duan Haifeng Zhang Shuo Huang Guojia Ma Tongmin Wang Xinglong Dong Nan Jia Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116085China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern University.ShenyangJ10819China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholmSE-10044Sweden Beijing Aeronautical Manufacturing Technology Research Institute Beijing100024.China Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyLiaoning116024China

We design high entropy alloys(HEAs) with different induction elements(Si/Al/Sn).In order to keep the crystal structure invariant and to investigate how the increment in saturation magnetization(Ms)is caused only by the change of electron spin state,each set of HEAs contains a different amount of *** effects among induction elements that induce the magnetic transformation of Mn from anti-ferromagnetism to ferromagnetism are *** of added Mn reduces when a particular induction element(Si_(0.4)/Al_(0.4)/Sn_(0.4)) exists,while a larger increment of Ms appears when two induction elements coexist,Si_(0.4)Al_(0.4)(25.79 emu/g) and Sn_(0.4)Al_(0.4)(15.43 emu/g).This is reflected in the microcosmic magnetic structure for the emergence of closed domains due to large demagnetization energy,which is confirmed by the Lorentz transmission electron microscope(LTEM) *** calculated magnetic moments and the exchange integral constants from density functional theory based on the Exact Muffin-Tin Orbits fo rmalism reveal that the magnetic state and the strength of fe rromagnetic and anti-ferromagnetic coupling determine the variation of Ms in different chemical *** difference in energy levels of coexisting multiple induction elements also leads to a larger increment of Ms,Si_(0.4)Al_(0.4)Sn_(0.4)(29.78 emu/g),and Si_(0.4)Al_(0.4)Ge_(0.4)Sn_(0.4)(31.00 emu/g).

关键词： High entropy alloy Magnetic transformation Density functional theory Magnetic moment Exchange integral constants

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Addition Al and/or Ti Induced Modifi cations of Microstructures, Mechanical Properties, and Corrosion Properties in CoCrFeNi High-Entropy Alloy Coatings

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1087-1102页

作者： Guoliang Ma Yong Zhao Hongzhi Cui Xiaojie Song Mingliang Wang Kwangmin Lee Xiaohua Gao Qiang Song Canming Wang School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Materials Science and Engineering Chonnam National UniversityGwangju 61186Korea

The purpose of this work is to study the influences of Al and/or Ti addition on the microstructures, mechanical properties and corrosion properties of CoCrFeNi-(Al, Ti) high entropy alloy(HEA) coatings. Three coatings, AlCoCrFeNi(Ⅰ), CoCrFeNiTi_(0.5)(Ⅱ) and AlCoCrFeNiTi_(0.5)(Ⅲ), were fabricated by laser cladding successfully. The AlCoCrFeNi(Ⅰ) coating exhibited a simple body-centered cubic(BCC) solid-solution structure, whereas the CoCrFeNiTi_(0.5)(Ⅱ) alloy exhibited a face-centered cubic(FCC) solid-solution and a small amount of Laves phase. The BCC phases in AlCoCrFeNiTi _(0.5)(Ⅲ) coating were characterized as Fe–Cr rich disordered BCC phases(A2) and Al-Ni–Ti-rich ordered BCC phases(L2_1) separately. The AlCoCrFeNiTi_(0.5)(Ⅲ) coating with dual-phase BCC structure showed the optimal performance of both mechanical and corrosion properties, which was superior to BCC-based AlCoCrFeNi(Ⅰ) and FCC-based CoCrFeNiTi_(0.5)(Ⅱ) coatings. Nanoindentation tests and quantitative investigations on the strengthening mechanisms of AlCoCrFeNiTi_(0.5)(Ⅲ) coating were conducted, suggesting that the precipitation strengthening is the dominant strengthening mechanism. In short, the addition of moderate amount of Al and Ti in CoCrFeNi HEA shows potential for the development of a high strength and corrosion-resistant coating.

关键词： High entropy alloy Laser cladding Corrosion properties Mechanical properties

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