摘要：CoCrCuFeNiMn0.8和CoCrCuFeNiMn1.0高熵合金拥有良好的力学性能。本实验选择三个不同的温度600℃，700℃，800℃对高熵合金进行热处理保温时间为24h，选取的热处理方式为水淬。利用XRD、SEM、EDS、压缩实验和硬度测试等分析测试方法研究热处理对不同Mn含量高熵合金组织及其性能的影响。研究结果显示，热处理前后两种合金都只有FCC相，没有新相的产生；SEM微观形貌观察的结果显示两种合金热处理前后的组织都是树枝晶和枝晶间组织，这表明两种合金都有良好的组织稳定性；两种合金都有较好的塑性，600℃水淬后屈服强度最大，达到了363.5MPa，随着热处理温度的升高，Mn0.8合金硬度逐渐变小，但都低于铸态，铸态合金硬度最大，达到了237.5HV；Mn1.0合金的硬度随热处理温度升高而下降，在600℃保温24h水淬后，Mn1.0合金屈服强度为323.7MPa，硬度达到224.4HV，此时屈服强度和硬度最大，Mn1.0合金600℃保温24h水淬后拥有最佳力学性能。

关键词：高熵合金；热处理；力学性能；微观结构

Abstract：Based on CoCrCuFeNiMn0.8 and CoCrCuFeNiMn1.0, the high entropy alloy has good mechanical properties. In this experiment, three different temperatures, 600 ℃, 700 ℃and 800 ℃ were selected to heat the high entropy alloy. The holding time was 24h, and the selected heat treatment   mode   was   water   quenching.   By   means   of   XRD,SEM, EDS,compression test and hardness test, the effect of heat treatment on the microstructure and properties of high entropy alloy with different Mn content was investigated. The results show that after heat treatment of two kinds of alloy phase only FCC phase, no new phase; SEM morphology observation results showed that two kinds of alloys before and after heat treatment are dendrite and interdendrite structures, which indicates that two kinds of alloys have good organizational stability;  two kinds of alloys have better ductility,  maximum yield strength of 600    ℃ after water quenching, reached 363.5MPa, with the increase of heat treatment temperature, hardness of Mn0.8 alloy decreases, but lower than the cast, cast hard alloy is the largest, reached 237.5HV; the hardness of Mn1.0  alloy increases  with  the  increase  of  heat  treatment temperature decreased in 600 ℃ water quenched Mn1.0 alloy 24h, yield strength is 323.7MPa, the hardness reaches 224.4HV, the yield strength and hardness of Mn1.0 alloy, 600 ℃ for 24h water The best mechanical properties are obtained after quenching.

Keywords:High entropy alloy;Heat treating; Mechanical property; Microstructure

目录

第一章绪论 1

1.1引言 1

1.2多主元高熵合金的概念和定义 1

1.3高熵合金的特点 2

1.3.1高熵合金结构特点 2

1.3.2高熵合金性能特点 3

1.4高熵合金的制备方法和元素选择 4

1.4.1高熵合金制备方法 4

1.4.2高熵合金元素选择 5

1.5高熵合金的研究现状 5

1.6高熵合金的前景展望 8

1.7选题的内容及意义 9

第二章实验材料和研究方法 10

2.1前言 10

2.2实验方案 10

2.2.1实验材料与制备方法