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Journal of Central South University 2024年第2期31卷 369-383页

作者：张安鑫李峰牛文涛高融合孙璐 School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification&Green Forming Technology Harbin 150040China

Mg/Al复合板兼并了镁合金的轻质性及铝合金的可塑性、耐腐蚀等性能,显著增强了其综合性能,但制造周期长、工艺要求高等不足制约了异质复合板成形技术的快速发展。为此,本文提出一种衬板辅助叠轧成形新方法。研究结果表明:3ARB时Mg/Al复... 详细信息

Mg/Al复合板兼并了镁合金的轻质性及铝合金的可塑性、耐腐蚀等性能,显著增强了其综合性能,但制造周期长、工艺要求高等不足制约了异质复合板成形技术的快速发展。为此,本文提出一种衬板辅助叠轧成形新方法。研究结果表明:3ARB时Mg/Al复合板抗拉强度可达235 MPa,伸长率为14.7%,镁板中出现明显的韧窝,呈韧性断裂特征,综合性能为最佳。由于此时Mg板基面滑移与非基面滑移同时开动,促进了动态再结晶的生成,此时Mg板再结晶比例为77.21%。随着累积叠轧的进行,大角度晶界增加和晶粒细化明显,原始晶粒已经基本破碎细化成等轴晶,Mg、Al基体硬度波动逐渐减小,复合板内部结构逐渐趋于稳定。本研究可为高性能异质复合板成形制造提供了一种新思路。

关键词：衬板叠轧 Mg/Al复合板再结晶晶粒细化强塑性

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Enhancing Mechanical Performance and Cavitation Erosion-Corrosion Resistance in fcc Multi-Principal Element Alloy Through L12 Precipitates 75

Enhancing Mechanical Performance and Cavitation Erosion-Corr...

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75th World Foundry Congress, WFC 2024

作者： Niu, Jiacheng Fu, Zhiqiang Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510640 China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology Guangzhou510640 China

The effects of L12 nano-precipitates on the mechanical properties and resistance to cavitation erosion-corrosion (CE-C) of multi-principal element alloy (MPEA) with a fcc structure were investigated. Heat treatment involving homogenization and aging introduces abundant spherical L12 precipitates into the fcc MPEA matrix. This not only significantly enhances the alloy’s strength but also reduces volume loss in deionized water and NaCl solution, thereby improving its CE-C resistance. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Cavitation

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Self-templating synthesis and structural regulation of nanoporous rhodium-nickel alloy nanowires efficiently catalyzing hydrogen evolution reaction in both acidic and alkaline electrolytes

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Nano Research 2023年第2期16卷 2026-2034页

作者： Zhihua Zhai Yan Wang Conghui Si Pan Liu Wanfeng Yang Guanhua Cheng Zhonghua Zhang Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China School of Materials Science and Engineering University of JinanJinan 250022China Shandong Provincial Key Laboratory of Processing and Testing Technology of Glass&Functional Ceramics School of Materials Science and EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Highly active and stable electrocatalysts to produce hydrogen through water splitting are crucial for clean energy systems but are still ***,a novel self-templating strategy was proposed to synthesize one-dimensional nanoporous RhNi alloy nanowires through combining metallurgical eutectic solidification and microalloying with chemical ***-situ X-ray diffraction and ex-situ characterizations reveal that the Al matrix served as a template to guide the growth of the Al3(Ni,Rh)nanowires during eutectic solidification of Al-Ni-Rh precursor and was completely removed in the dealloying ***,the nanowire morphology could be well retained and the dealloying of Al_(3)(Ni,Rh)led to the formation of nanoporous RhNi alloy *** length scale of the RhNi nanowires could be facilely regulated by changing the solidification *** importantly,the RhNi catalysts show excellent electrocatalytic activity and stability towards hydrogen evolution reaction in both acidic and alkaline media,which has been rationalized by density functional theory calculations.

关键词： nanoporous alloys nanowires hydrogen evolution reaction density functional theory dealloying

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晶粒尺寸对Inconel 718薄板塑性微变形行为的影响:实验与建模

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Journal of Central South University 2024年第5期31卷 1412-1425页

作者：纪开盛刘艳雄张怡俊宋燕利尹飞魏文婷 Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center for Green Precision Material Forming Wuhan University of TechnologyWuhan 430070China Hubei Key Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China

随着航空航天工业的迅速发展,对微型化Inconel 718薄板构件的需求越来越大。然而,晶粒尺寸显著影响金属薄板的塑性变形行为,在很大程度上限制了Inconel 718薄板构件的生产和应用。本文对不同晶粒尺寸的Inconel 718薄板进行了一系列单轴... 详细信息

随着航空航天工业的迅速发展,对微型化Inconel 718薄板构件的需求越来越大。然而,晶粒尺寸显著影响金属薄板的塑性变形行为,在很大程度上限制了Inconel 718薄板构件的生产和应用。本文对不同晶粒尺寸的Inconel 718薄板进行了一系列单轴拉伸试验和扫描电镜实验,研究了晶粒尺寸对其塑性变形行为的影响。通过EBSD技术表征了晶粒尺寸、晶粒取向和晶粒平均取向偏差,阐明了晶粒尺寸效应的变形机制。研究结果表明,随着晶粒尺寸的增大,在拉伸应力作用下,晶粒旋转和协调变形机制减弱,取向转变为<232>的晶粒数量逐渐减少,从而导致屈服强度和最大抗拉强度显著降低;此外,随着晶粒尺寸的增大,晶粒内部的塑性变形明显减弱,晶界滑动逐渐成为拉伸过程中主要的变形机制,导致断裂应变减小,韧性断裂特征减弱。本文综合考虑晶粒尺寸和应变量影响,建立了能够应用于Inconel 718薄板的微成形研究的混合材料本构模型。

关键词： Inconel 718薄板晶粒尺寸力学性能断裂机理混合材料本构模型

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Heat treatment effects on the metastable microstructure,mechanical property and corrosion behavior of Al-added CoCrFeMnNi alloys fabricated by laser powder bed fusion

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Journal of Materials Science & technology 2023年第7期138卷 171-182页

作者： Decheng Kong Li Wang Guoliang Zhu Yiqi Zhou Xiaoqing Ni Jia Song Liang Zhang Wenheng Wu Wei Wu Cheng Man Da Shu Baode Sun Chaofang Dong Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

With the development of aerospace and transportation,high-strength structural materials manufactured by additive manufacturing techniques get more attention,which allows the production of counterparts with complex *** work investigates Al-added CoCrFeMnNi high-entropy alloys(Al-HEAs)pre-pared by laser powder bed fusion(PBF-LB),adding 4.4 wt.%Al reducing approximately 7%*** contribution of post-heat-treatment to microstructure,mechanical properties,and corrosion behaviors are *** cracking along with grain boundaries in the as-built PBF-LB Al-HEAs is determined,which comes from the residual liquid film as a larger solidification temperature range by adding *** PBF-LB Al-HEAs mainly consist of a face-centered cubic(FCC)matrix with Al/Ni/Mn decorated dislocation cells therein and a minor body-centered cubic(BCC)*** 850℃ annealing treatment,massive BCC phases(ordered NiAl and disordered Cr-rich precipitates)generate at the dislocation cell/grain bound-aries and the dislocation cells are still ***,the volume fraction of BCC phases and the dislocation cells vanish after 1150℃ solution *** a result,Al-HEA850 shows an over 1000 MPa yield strength with nearly no ductility(<3%);the Al-HEA1150 exhibits considerable strength-ductility ***,the Al-HEA850 demonstrates the worst pitting corrosion resistance due to the preferential dissolution of the NiAl precipitates in chloride-containing *** comparatively de-liberating the evolution of strength-ductility and localized corrosion,we built a framework about the effects of the heat treatment on the mechanical property and degradation behavior in additively manu-factured Al-added high-strength HEAs.

关键词： High entropy alloy Laser powder bed fusion Heat treatment Dislocation cell Mechanical property Corrosion behavior

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Microstructure and mechanical properties of Mg-3Sn-1Ca reinforced with AlN nano-particles

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Journal of Magnesium and Alloys 2023年第1期11卷 259-269页

作者： Shaozhu Wang Yuanding Huang Lixiang Yang Ying Zeng Yaozeng Hu Xiao Zhang Qiang Sun Shaojun Shi Guangyao Meng Norbert Hort School of Mechanical&Automotive Engineering Qingdao University of TechnologyTsingtao 266520PR China MagIC-Magnesium Innovation Center Helmholtz-Zentrum GeesthachtMax-Planck-Strasse 1Geesthacht 21502Germany Linyi Institute of Industrial Technology Linyi 276000PR China Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240PR China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031PR China Shandong Yinguang Yuyuan Light Metal Precise Forming Co. LtdShandong 273400PR China

Microstructural evolution and strengthening mechanisms of Mg-3Sn-1Ca based alloys with additions of different amounts of Al N nanoparticles were *** was found that with increasing the amount of AlN nano-particles the grain size decreases *** existence of AlN nano-particles could refine the primary crystal phases CaMgSn,which provided more heterogeneous nucleation sites for the formation of ***,such nano-particles could also restrict the grain growth during *** adding AlN nano-particles,both the tensile properties at room temperature and high temperature 250℃and the hardness are largely *** improvement of strength is attributed to grain refinement and second phase refinement.

关键词： Mg-Sn-Ca alloy AlN nano-particles Microstructure Strengthening mechanisms Grain refinement

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Study on the effect of tempering on the impact abrasive wear performance of 45Si2MnCr2Mo ultra-high strength steel 10

Study on the effect of tempering on the impact abrasive wear...

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2023 10th International Conference on advanced Manufacturing technology and Materials Engineering, AMTME 2023

作者： Yang, Ming Chen, Xiaohua Wang, Zidong Pan, Peng Beijing National Innovation of Lightweight Ltd Beijing Beijing100083 China State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and Technology Beijing100083 China School of Materials Science and Engineering University of Science and Technology Beijing100083 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

In this paper, three-body impact abrasive wear tests of 45Si2MnCr2Mo ultra-high strength steel (UHSS) at different tempering temperatures were carried out by using the MLD-10 impact abrasive wear machine. The effects of different tempering temperatures on the wear weight loss and the depth of the hardened layer of UHSS were investigated. The results show that the weight reduction rate of the steels tempered at 150 and 220 °C decreases at first and then increases with time, but the steels tempered at 290 and 360 °C gradually increase with time. The surface and subsurface areas of UHSS are strengthened by work hardening after wear. The wear performance of UHSS should consider the change of weight reduction rate with time rather than just considering short-term weight loss. UHSS tempered at 150 °C has the best comprehensive surface hardness, hardening percentage, and effective hardened layer depth, and the wear process is more uniform. © Published under licence by IOP Publishing Ltd.

关键词： High strength steel

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Second Nearest-Neighbor Modified Embedded Atom Method Interatomic Potential for Cu-Ni-Sn Ternary System

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Computers, Materials & Continua 2025年第4期83卷 65-77页

作者： Jialiang Dong Xuemao Dong Zhongxue Feng Caiju Li Jianhong Yi Jun Tan School of Materials Science and Engineering Guizhou Minzu UniversityGuiyang550025China Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-Net-Shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou510640China Faculty of Electronic and Information Engineering Anshun UniversityAnshun561000China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China College of Materials Science and Engineering Chongqing UniversityChongqing400044China

To explore atomic-level phenomena in the Cu-Ni-Sn alloy,a second nearest-neighbor modified embedded-atom method(2NN MEAM)potential has been developed for the Cu-Ni-Sn system,building upon the work of other *** potential demonstrates remarkable accuracy in predicting the lattice constant,with a relative error of less than 0.5%when compared to density functional theory(DFT)results,and it achieves a 10%relative error in the enthalpy of formation compared to experimental data,marking substantial advancements over prior *** bulk modulus is predicted with a relative error of 8%compared to ***,the potential effectively simulates the processes of melting and solidification of Cu-15Ni-8Sn,with a simulated melting point that closely aligns with the experimental value,within a 7.5%*** serves as a foundation for establishing a 2NN MEAM potential for a flawless Cu-Ni-Sn system and its microalloying systems.

关键词： 2NN MEAM Cu-Ni-Sn interatomic potential atomistic simulation

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Strength-ductility balance of AZ31 magnesium alloy via accumulated extrusion bonding combined with two-stage artificial cooling Author links open overlay panel

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Journal of Magnesium and Alloys 2023年第5期11卷 1549-1555页

作者： Tingzhuang Han Guangsheng Huang Heng Li Lifei Wang Hua Zhang Fusheng Pan State Key Laboratory of Solidification Processing School of Materials Science&EngineeringNorthwestern Polytechnical UniversityXi'an 710072PR China Shaanxi Key Lab oratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi'an 710072PR China State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044PR China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024PR China Institute for Advanced Studies in Precision Materials Yantai UniversityYantai 264005PR China

AZ31 Mg alloy with heterogeneous bimodal grain structure(smaller grain size of 5-20µm and coarser grain size of 100-200µm)was subjected to accumulated extrusion bonding(AEB)at 250℃combined with two-stage artificial cooling in this work,*** water cooling and artificial *** microstructure developed consecutively as a result of discontinuous dynamic recrystallization(DDRX)for the AEBed samples.{10-12}tensile twinning also played an important role for the AEB with local water cooling at the initial extrusion stage in the *** water cooling could further reduce the DRXed grain size to~2.1µm comparing that without water *** the grain growth rate was reduced by artificial cooling out of extrusion *** the combination of two-stage cooling,the fine DRXed grains at sizing band were almost retained with average grain size of~2.3µm after the sheet out of extrusion die,and the unDRXed grains with high residual dislocation density accumulation were also *** tensile tests results indicated that a good strength-ductility balance with a high ultimate tensile strength(319 MPa vs.412 MPa)and fracture elongation(19.9%vs.30.3%)were *** strength enhancement was mainly owing to the grain refinement and local residual plastic strain reserved by the artificial *** excellent ductility originated from fine DRXed microstructure and ED-tilt double peak texture.

关键词： Magnesium alloy Accumulated extrusion bonding Local water cooling Artificial cooling Microstructure Mechanical properties

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Simulation and experimental research on extra-squeeze forming method during gradient sand molding

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China Foundry 2022年第4期19卷 288-298页

作者： Er-biao Jiang Zhong-de Shan Guang Cheng Shao-zong Wang Zhao-xian Gu Xin-lei Wang State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Co.Ltd.Beijing 100044China Nanjing University of Aeronautics and Astronautics Nanjing 210016China Beijing Union University Beijing 100101China

The flexible extrusion forming process (FEFP) is a sand mold patternless manufacturing technology that enables digital near-net shaping of complex sand molds. But, it is difficult to achieve the gradient sand molds with high surface strength and strong interior permeability by FEFP. To solve this problem, an extra-squeeze forming method based on FEFP for gradient sand mold was developed. To further reveal the extra-squeeze forming mechanism, based on the Johnson-Kendall-Roberts (JKR) theory and “gluing” notions, the single and double-sided squeeze models of gradient sand molds were established using the EDEM software. The squeezing processes of sand molds with different cavity depths of 60, 100, 140, 180, and 220 mm were systemically studied under single and double-sided squeeze conditions. The variation in the void fraction of sand mold as also investigated at a variety of extra-squeeze distances of 2, 3, 4, 5, and 6 mm, respectively. Simulation and test results show that a deeper cavity depth weakens the extrusion force transmission, which leads to a decrease in strength. The sand mold permeability and void fraction are identified to be positively correlated, while the tensile strength and void fraction appear to be negatively correlated. The void fraction of sand molds decreases with a longer extra-squeeze distance. A 6 mm extra-squeeze distance for the sand mold with 220 mm cavity depth results in a 26.8% increase in tensile strength with only a 5.7% reduction in the permeability. Hence, the extra- squeeze forming method can improve the quality of the sand mold by producing a gradient sand mold with high surface strength and strong interior permeability.

关键词： patternless casting gradient squeeze sand mold performance discrete element simulation void fraction

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