文章编号：1004－5422(2021)04－0404－06

DOI:10.3969/j.issn.1004-5422.2021.04.012

FeCoNiCrMn高熵合金的力学性能及耐腐蚀性能分析

刘  佳^1,2，安旭光^1,2，孔清泉^1,2，舒  茗³，吴小强^1,2，罗元祺^1,2，张  靖^1,2

(1.成都大学  机械工程学院，四川  成都  610106；2.成都大学  四川省粉末冶金工程技术研究中心，四川  成都  610106；3.中国核动力研究设计院，四川  成都  610014 )

摘  要： FeCoNiCrMn高熵合金是目前性能最出色的单相高熵合金之一，成为了当前领域的研究热点.本研究通过放电等离子烧结将FeCoNiCrMn高熵合金粉末烧结成块，并利用X射线衍射仪、硬度计、万能试验机、电化学工作站以及扫描电子显微镜等设备测试和分析了FeCoNiCrMn高熵合金的晶体结构、力学性能和耐腐蚀性能.力学性能结果表明：随着烧结压力从30 MPa增加至50 MPa，合金的延伸率从45.2%提升至48.1%.电化学结果表明：在3.5 wt.% NaCl溶液和0.5 mol/L H₂SO₄溶液中，FeCoNiCrMn高熵合金具有比1Cr18Ni9Ti不锈钢更负的腐蚀电位，更大的腐蚀电流密度，腐蚀类型主要以点蚀为主，在0.5 mol/L H₂SO₄溶液中高熵合金抵抗高电位腐蚀的能力较强.

关键词：高熵合金；放电等离子烧结；烧结压力；力学性能；耐腐蚀性能

中图分类号：TG135+.4；TG174.3+6    文献标识码：A

Analysis of Mechanical and Corrosion Properties of FeCoNiCrMn High Entropy Alloy

LIU Jia^1,2，AN Xuguang^1,2，KONG Qingquan^1,2，SHU Ming³，WU Xiaoqiang^1,2，LUO Yuanqi^1,2，ZHANG Jing^1,2

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

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

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

Abstract：FeCoNiCrMn high-entropy alloy is one of the best single-phase high-entropy alloys at present and has become a research hotspot in the current field.This paper studied the FeCoNiCrMn high-entropy alloy bulk that was prepared by spark plasma sintering (SPS).The crystal structure,mechanical properties and corrosion resistance of FeCoNiCrMn high-entropy alloy were investigated and analyzed by X-ray diffractometer (XRD),microhardness tester,universal testing machine,electrochemical workstation and scanning electron microscope (SEM).The results of mechanical properties showed that the elongation of the alloy increased from 45.2% to 48.1% with the increase of sintering pressure from 30 MPa to 50 MPa.The electrochemical performance showed that in 3.5 wt.% NaCl solution and 0.5 mol/L H₂SO₄solution,FeCoNiCrMn high-entropy alloy had lower corrosion potential and higher corrosion current density than 1Cr18Ni9Ti stainless steel.Its corrosion was mainly characterized by pitting corrosion.In 0.5 mol/L H₂SO₄ solution,FeCoNiCrMn high-entropy alloy performed better towards high potential corrosion.

Key words：entropy alloy;spark plasma sintering;sintering pressure;mechanical property;corrosion resistance