激光表面处理Al_(0.3)CoCrFeNi高熵合金组织特征  

Microstructure Characterization of Al_(0.3) CoCrFeNi High-Entropy Alloy with Pulsed Laser Surface Treatment

作　　者：张金龙[1,2] 邱日盛[1,2] 谭希努 张惠 柴林江[3] 毕凤仙 刘庆[1,4] Zhang Jinlong;Qiu Risheng;Tan Xinu;Zhang Hui;Chai Linjiang;Bi Fengxian;Liu Qing(International Joint Laboratory for Light Alloys,Chongqing University,Chongqing 400044,China;Electron Microscopy Center,Chongqing University,Chongqing 400044,China;College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400045,China;Key Laboratory for Light-Weight Materials,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]重庆大学轻合金材料国际合作联合实验室,重庆400044 [2]重庆大学电子显微镜中心,重庆400044 [3]重庆理工大学材料科学与工程学院,重庆400045 [4]南京工业大学先进轻质高性能材料研究中心,江苏南京210009

出　　处：《稀有金属材料与工程》2022年第1期30-35,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China (51421001);111 Project Sponsored by Ministry of Education and State Administration of Foreign Experts Affairs of China (B16007)。

摘　　要：通过4种不同功率的脉冲激光(150,250,350,450 W)对铸态Al_(0.3)CoCrFeNi高熵合金进行处理。按相对于激光源的位置,合金组织分为3个部分:内部具有细胞状结构的中心影响区,具有长条结构的边缘影响区,以及未受影响的原始晶粒区域。由于激光引起的快速熔化和凝固,经不同功率处理的样品截面中均观察到细胞结构;另外,在激光影响区边缘发现了长条细胞结构。之后,将激光处理的样品分别在660和800℃下退火2 h,可以观察到沿细胞结构边界有沉淀相析出。通过硬度测试,表明激光表面处理和后续热处理相结合的方法显著提升了合金的硬度。The as-cast Al_(0.3)CoCrFeNi high-entropy alloy(HEA) surface was treated by pulsed laser at four different powers(150, 250,350, 450 W). According to the positions relative to the laser source, HEA structure could be transformed into three parts: the center of laser-affected zone with the cellular structure, the edge of laser-affected zone with the banded cellular structure along the grain boundary, and the unaffected area with original grains. Attributed to the rapid melting and solidification induced by pulsed laser, the cellular structure can be observed in all specimens processed at different powers. Additionally, the long cellular structures can be observed in the edge of the laser-affected zone. Then the specimens after pulsed laser surface treatment were annealed at 660 and800 ℃for 2 h, which leads to the precipitations along the boundaries of the cellular structure. The hardness test results show that the combined method of pulsed laser surface treatment with heat treatment improves the hardness of Al_(0.3)CoCrFeNi HEA remarkably.

关 键 词：高熵合金 表面处理 脉冲激光 微观结构 热处理 

分 类 号：TG139[一般工业技术—材料科学与工程] TG665[金属学及工艺—合金]