文章编号：1004－5422(2022)01－0065－06

DOI:10.3969/j.issn.1004-5422.2022.01.011

Al含量对Al_xFeNi_2.5CrMo高熵合金微观结构与力学性能的影响

罗元祺^1,2，刘　佳^1,2，雷　宇³，安旭光^1,2，孔清泉^1,2，舒　茗⁴

（1.成都大学  机械工程学院,四川 成都 610106；2.成都大学 四川省粉末冶金技术研究中心,四川 成都 610106；

3.成都华微电子科技股份有限公司,四川 成都 610095；4.中国核动力研究设计院,四川 成都 610213）

摘　要：针对现有铁素体钢在反应堆压力容器中抗压强度低与低温脆性高的问题，采用真空电弧熔炼法制备了系列Al_xFeNi_2.5CrMo高熵合金试样，并利用X射线衍射、扫描电子显微镜、能量散射谱以及力学性能测试等方式分析了Al含量对高熵合金微观结构和力学性能的影响.实验结果表明，制备的Al_xFeNi_2.5CrMo高熵合金主要由面心立方主相和少量的Laves相组成，其微观组织呈现出典型的树枝晶和枝晶间结构，且枝晶的分布均匀性随着Al含量的增加而变差；其抗压强度和抗拉强度随着Al含量的增加呈现出先增加后降低的趋势，当Al含量x=0.2时，高熵合金的抗压强度和抗拉强度达到最大值，分别为3 984 MPa和795 MPa.

关键词：高熵合金；真空电弧熔炼；力学性能；微观结构；反应堆压力容器

中图分类号：TG135+.1；TG15    文献标志码：A

Effect of Al Content on Microstructure and Mechanical Properties of Al_xFeNi_2.5CrMo High

Entropy Alloy

LUO Yuanqi^1,2,LIU Jia^1,2,LEI Yu³ ,AN Xuguang^1,2,KONG Qingquan^1,2,SHU Ming⁴

(1.School of Mechanical Engineering,Chengdu University,Chengdu 610106,China;

2.Sichuan Engineering Research Center of Powder Metallurgy,Chengdu University,Chengdu 610106,China;

3.Chengdu Sino Microelectronics Technology Co.,Ltd.,Chengdu 610095,China;

4.Nuclear Power Institute of China,Chengdu 610213,China)

Abstract：Aiming at some problems of the existing ferritic steel in RPV reactor pressure vessel,a series of Al_xFeNi_2.5CrMo HEAs were prepared by vacuum arc melting method.The influence of the mechanical properties and microstructure of Al_xFeNi_2.5CrMo HEAs with different Al content was studied by XRD,SEM,EDS and tensile compression experiments.The result showed that Al_xFeNi_2.5CrMo HEAs were composed of FCC phase and secondary Laves phase.The microstructure presented typical dendritic and inter dendritic structure,which was evenly distributed.With the increase of Al content,there appeared a local uneven distribution in dendritic.Meanwhile,the ultimate compressive strength and ultimate tensile strength of HEAs increased first and then decreased with the increase of AI content,and when the x was 0.2.the ultimat compressive strengrh and the ultimale tensile strength reached the maximum value of 3 984MPa and 795 MPa respectively.

Key words：highentropy alloys;vacuum arc melting;mechanical property;microstructure;reactor pressure vessel