热处理对FeCoCrNiMnC_(0.1)高熵合金组织结构与力学性能的影响

Effects of Heat Treatment on Microstructure and Mechanical Properties of FeCoCrNiMnC_(0.1) High-Entropy Alloy

采用冷坩埚悬浮熔炼法制备了FeCoCrNiMnC_(0.1)(下标为物质的摩尔比,未标注为1)高熵合金铸锭,利用X射线衍射仪、扫描电镜、显微硬度计、万能材料试验机等研究了热处理对合金组织结构和力学性能的影响。结果表明:铸态FeCoCrNiMnC_(0.1)高熵合金组织由基体和晶界处的M_7C_3相组成,随着热处理温度升高,合金中颗粒状M_(23)C_6相长大且分布均匀;随着热处理温度上升,合金硬度先降低后升高再降低,在热处理温度900℃时达到最大值279.1HV;合金强度先增后减,在热处理温度800℃时最高,为930MPa。

FeCoCrNiMnC0.1（Subscript is the molar ratio of matter, and the not marked subscript is 1） high-entropy alloy ingots were prepared by using cold crucible levitation melting method. Effect of heat treatment on microstructure and mechanical properties of the alloy was researched by using X ray diffraction（XRD）, scanning electron microscope（SEM）, micro-hardness tester and universal material testing machine. The results show that the microstructure of as cast FeCoCrNiMnC0.1high entropy alloy is composed of the matrix and M7C3 phase at grain boundaries. With the increase of heat treatment temperature, the granular M23C6 phase in the alloy grows up and distribution is uniform. The hardness of the alloy decreases firstly then increases, and then decreases, and the maximum value（279.1HV）is reached at heat treatment temperature of 900℃. The strength of alloy increases firstly and then decreases, which is the highest（930MPa） at heat treatment temperature of 800℃.