Al_(0.1)CoCrFeNi高熵合金的力学性能和变形机理  

Mechanical properties and deformation mechanisms of Al_(0.1)CoCrFeNi high-entropy alloys

作　　者：陈刚 王璐 杨静[2] 李强 吕品 马胜国[1,2,3] CHEN Gang;WANG Lu;YANG Jing;LI Qiang;LYU Pin;MA Sheng-guo(Institute of Applied Mechanics and Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Material Strength and Structural Impact,Taiyuan University of Technology,Taiyuan 030024,China;National Demonstration Center for Experimental Mechanics Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学应用力学与生物医学工程研究所,太原030024 [2]太原理工大学材料强度与结构冲击山西省重点实验室,太原030024 [3]太原理工大学力学国家级实验教学示范中心,太原030024

出　　处：《材料工程》2019年第1期106-111,共6页Journal of Materials Engineering

基　　金：国家自然科学基金(51501123;11602158;11502155);山西省高等学校科技创新项目(2015127)

摘　　要：Al_(0.1)CoCrFeNi高熵合金由真空磁悬浮熔炼制备而成,利用INSTRON力学试验机进行室温准静态拉伸,采用X射线衍射仪(XRD)、光学显微镜、扫描电镜(SEM)、透射电镜(TEM)和纳米压痕仪对实验前后样品的晶体结构、形貌、成分、组织、硬度和蠕变行为进行了研究。结果表明,经拉伸变形后,合金具有优异的强塑积(约为24GPa·%)、显著的应变硬化效应和更好的抗蠕变行为。试样的断裂模式为典型的微孔聚集型断裂。晶粒内部含有大量的微带组织,其带宽为200～300nm。分析认为,微观组织中的微带诱导塑性效应是合金具有优异的应变硬化能力的一个重要原因。The Al0.1CoCrFeNi high-entropy alloy (HEA) was melted by vacuum magnetic levitation,and quasi-static tensile experiments were performed by using an INSTRON mechanical testing system.The crystal structure,surface morphology,composition,microstructure,hardness,and creep behavior of the samples before and after the experiment were analyzed by X-ray diffraction,optical microscopy,scanning electron microscopy,transmission electron microscopy,and nanoidentation.Results reveal that after tensile deformation,the alloy has an excellent strength-ductility combination,a significant strain-hardening effect,and an improved creep resistance.The fracture mode of sample is the typical microvoid accumulation fracture;there are a lot of microbands (the band width is about 200-300nm) inside the grains.The excellent strain-hardening ability is believed to be originated from the microband-induced plasticity effect during tensile loading.

关 键 词：高熵合金 微观组织 力学性能 微带诱导塑性效应 

分 类 号：TG113[金属学及工艺—物理冶金]