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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。
High-entropy alloy ingot FeCoCrNiMnC_ (0.1) (subscript molar ratio, not marked as 1) was prepared by cold crucible suspension melting method and characterized by X-ray diffraction, scanning electron microscopy, microhardness tester, universal material testing machine Studied the effect of heat treatment on the microstructure and mechanical properties of the alloy. The results show that the microstructure of as-cast FeCoCrNiMnC_ (0.1) high entropy alloy is composed of matrix and M_7C_3 phase at the grain boundary. With the increase of heat treatment temperature, the granular M_ (23) C_6 phase in the alloy grows and distributes uniformly. The hardness of the alloy first decreases, then increases and then decreases, reaching the maximum value of 279.1 HV at the temperature of 900 ° C. The alloy strength first increases and then decreases, and reaches the highest at the temperature of 800 ° C, which is 930 MPa.