As-cast Ti_(x)(AlVCr)_(100−x)light-weight medium entropy alloys with high strength and uniform compressive plasticity  

高强度、均匀压缩塑性铸态Ti_(x)(AlVCr)_(100−x)轻质中熵合金

作　　者：Ming-jie KAI Yu-jie MA Xiao-tian WANG Liang CHENG Jian-bo HU Yao-yao HU Tai-ran XU Gui-jiang LI Xiang-kang MENG Zhen-hua CAO 开明杰;马玉洁;汪晓天;程靓;胡建波;胡瑶瑶;徐泰然;李贵江;孟祥康;操振华(南京工业大学材料科学与工程学院,南京210009;江苏航运职业学院智能制造与信息学院,南通226010;中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室,绵阳621900;南京大学现代工程与应用科学学院固体微结构国家重点实验室,南京210093)

机构地区：[1]College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China [2]School of Intelligent Manufacturing and Information,Jiangsu Shipping College,Nantong 226010,China [3]Laboratory for Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China [4]National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第1期194-206,共13页中国有色金属学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.52071176,12072331,51771090,51671103);the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions,China.

摘　　要：The effect of Ti content on the microstructure and mechanical properties of as-cast light-weight Ti_(x)(AlVCr)_(100−x)medium entropy alloys was studied by compressive tests,X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The results suggest that yield strength increases and then decreases with the increment of Ti content.The Ti_(60)(AlVCr)_(40)alloy has the best combination of high strength of 1204 MPa and uniform plastic strain of 70%,possessing a high specific yield strength of 255 MPa·cm^(3)/g.The enhancement of strength is mainly attributed to the synergic effects of solid-solution and coherent nano-precipitation strengthening,while dislocation motion such as dislocation pinning,entanglement and dislocation cells significantly increases the strain-hardening capacity.采用单轴压缩测试、X射线衍射、扫描电子显微镜和透射电子显微镜等研究了Ti含量对铸态轻质Ti_(x)(AlVCr)_(100−x)中熵合金显微组织与力学性能的影响。结果表明,随着Ti含量的增加,屈服强度先增加后减少。其中,Ti_(60)(AlVCr)_(40)合金的压缩强度和均匀塑性应变分别达到1204 MPa和70%,并具有255 MPa·cm^(3)/g的高比屈服强度,表现出最优的综合力学性能。强化效应主要归因于固溶强化和共格纳米析出强化的协同作用,位错运动如位错钉扎、缠结及位错胞的形成能显著提高中熵合金的应变硬化能力。

关 键 词：TiAlVCr medium entropy alloy solid solution strengthening b2 precipitate strain hardening behavior 

分 类 号：TG139[一般工业技术—材料科学与工程]