激光熔化沉积工艺对CrMnFeCoNi高熵合金组织和性能的影响  

Effect of laser melting deposition process on microstructure and mechanical properties of CrMnFeCoNi high-entropy alloys

作　　者：向硕 张雷[2] 刘学[2] 乐国敏[2] 戴晓军 李强[1] 李晋锋[2] XIANG Shuo;ZHANG Lei;LIU Xue;LE Guo-min;DAI Xiao-jun;LI Qiang;LI Jin-feng(School of Physics and Technology,Xinjiang University,Urumqi 830046,China;Institute of Materials,China Academy of Engineering Physics,Mianyang 621907,China;Institute of Chemical Materials.China Academy of Engineering Physics,Mianvanz 621907,China)

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046 [2]中国工程物理研究院材料研究所,四川绵阳621907 [3]中国工程物理研究院化工材料研究所,四川绵阳621907

出　　处：《材料热处理学报》2018年第10期29-35,共7页Transactions of Materials and Heat Treatment

基　　金：四川省科技计划项目(2018G20146);攀枝花财政科技专项资金项目(2017CY-G-21)

摘　　要：为了研究激光熔化沉积工艺对CrMnFeCoNi高熵合金微观组织与力学性能的影响,采用单向扫描和双向扫描两种沉积路线,分别在1000、1200和1400 W功率下制备出CrMnFeCoNi高熵合金。通过X射线衍射（XRD）、光学显微镜和力学拉伸实验等分析手段对CrMnFeCoNi高熵合金相组成、微观组织及力学性能进行了研究。研究结果表明：不同工艺参数条件下制备得到的CrMnFeCoNi高熵合金均为FCC单相固溶体结构;通过控制激光沉积功率,可调控CrMnFeCoNi高熵合金组织结构中柱状晶与等轴晶的比例;双向扫描工艺条件下制备得到的CrMnFeCoNi高熵合金具有更加均匀的组织以及更为优异的力学性能。In order to study the effect of laser melting deposition process on microstructure and mechanical properties of CrMnFeCoNi high-entropy alloys, the CrMnFeCoNi high-entropy alloys were prepared by unidirectional scanning process and bidirectional scanning process at 1000 W, 1200 W and 1400 W, respectively. The phase composition, microstructure, and mechanical properties of the CrMnFeCoNi high-entropy alloys were studied by means of X-ray diffraction（XRD）, optical microscope and mechanical tensile test. The results show that the CrMnFeCoNi high-entropy alloy prepared under different process parameters are all FCC single-phase solid solution structure; and the ratio of columnar crystal and equiaxial crystal in the structure of the CrMnFeCoNi high-entropy alloys can be controlled by controlling the laser deposition power. The CrMnFeCoNi high-entropy alloy prepared under the bidirectional scanning process has more uniform microstructure and better mechanical properties.

关 键 词：高熵合金 激光熔化沉积 微观组织 力学性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG146.2[金属学及工艺—合金]