Ti元素对Al1.2FeCrCoNiTix高熵合金微观组织及硬度的影响  

Effects of Ti Element on Microstructure and Hardness of Al1.2FeCrCoNiTix High-entropy Alloys

作　　者：董鑫涛 刘贵仲[1] 班煜峰 喻学谦 郭景杰[2] DONG Xintao, LIU Guizhong1, BAN Yufeng, YU Xueqian, GUO Jingjie2(1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China; 2. School of Materials Science and Engineering, Harbin Industrial University, Harbin 150001, Chin)

机构地区：[1]桂林电子科技大学广西信息材料重点实验室,广西桂林541004 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《热加工工艺》2018年第4期75-79,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(511610065)

摘　　要：采用非自耗真空电弧熔炼制备了Al_（1.2）Fe Cr Co Ni Tix（x=0、0.25、0.5、0.75、1）高熵合金。研究了微观组织、相变规律以及Ti含量的变化对该合金微观应力、晶粒大小和硬度变化的影响。结果表明：随着Ti添加量的增大,该合金逐渐表现出典型的树枝晶结构,而且晶间体积逐渐扩大;合金逐渐表现出三相,而且在不断加强;合金微观应力逐渐增大;晶粒尺寸先减小后增大,其中Al_（1.2）Fe Cr Co Ni Ti_（0.5）合金最小;硬度先增大后减小,其中Al_（1.2）Fe Cr Co Ni Ti_（0.5）合金最大。AlFeCrCoNiTi, （x--0, 0.25, 0.5, 0.75, 1） high-entropy alloys were fabricated by arc remelting. The effects ofruicrostructure, phase change rules and change of Ti content on the change of ruicroscopic stress, grain size and hardness werestudied. The results show that with the Ti addition increasing, the alloy gradually shows a typical dendrite structure and theinterdendrite volume gradually expands; the alloy gradually exhibits a three-phase and the intercrystalline volume continues toexpand; the microscopic stress gradually increases; the size of crystal grain decreases firstly and then increases, which theA1,2FeCrCoNiTioz alloy is minimum; the hardness increases firstly and then decreases, which the AIFeCrCoNiTi5 alloy ismaximum.

关 键 词：高熵合金 显微组织 XRD 硬度 

分 类 号：TG113.1[金属学及工艺—物理冶金]