FeCoNiCrMn高熵合金的力学性能及耐腐蚀性能分析

Analysis of Mechanical and Corrosion Properties of FeCoNiCrMn High Entropy Alloy

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.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制备的FeCoNiCrMn高熵合金的晶体结构、力学性能和耐腐蚀性能.力学性能测试结果表明: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%.电化学测试结果表明:在3.5 wt.%NaCl溶液和0.5 mol/L H_(2)SO_(4)溶液中,FeCoNiCrMn高熵合金具有比1Cr18Ni9Ti不锈钢更低的腐蚀电位,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 H_(2)SO_(4)溶液中高熵合金抵抗高电位腐蚀的能力较强.

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 H_(2)SO_(4)solution,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 H_(2)SO_(4)solution,FeCoNiCrMn high-entropy alloy performed better towards high potential corrosion.