CrFeCoNiB0.05Tix高熵合金的显微组织和力学性能

采用机械合金化和放电等离子烧结工艺制备了CrFeCoNiB_0.05Ti_x(x=0.2、0.4、0.6、0.8、1.0)高熵合金材料,通过X射线衍射分析、扫描电镜观察和能谱分析以及维氏硬度测试和压缩强度测试等,研究了Ti含量对高熵合金微观组织和力学性能的影响。结果表明,CrFeCoNiB_0.05Ti_x(x=0.2、0.4、0.6、0.8、1.0)高熵合金由FCC、BCC和α相组成。当x=1.0时,合金由BCC结构转向HCP结构并析出新相Laves相,其具有最高硬度416.54 HV0.2。当x=0.8时,合金达到最大抗压强度586.3 MPa。

Microstructure and mechanical properties of CrFeCoNiB0.05Tix high-entropy alloy

In order to study the effect of Ti content on microstructure and mechanical properties of high-entropy alloys, the CrFeCoNiB_0.05Ti_x(x=0.2,0.4,0.6,0.8,1.0) high-entropy alloy was prepared by mechanical alloying and spark-plasma sintering, then the microstructure was analyzed by X-ray diffraction, scanning electron microscope observation, energy spectrum analysis, and the properties were analyzed by Vickers hardness test and compressive strength test. The results show that the CrFeCoNiB_0.05Ti_x(x=0.2,0.4,0.6,0.8,1.0) high-entropy alloy is composed of FCC, BCC and α phases. Moreover, when x is 1.0, the alloy changes from BCC structure to HCP structure, and a new Laves phase is precipitated, the alloy has the highest hardness of 416.54 HV0.2. When x is 0.8, the alloy reaches the maximum compressive strength of 586.3 MPa.