铸态(Fe33Cr36Co15Ni15Ti1)96Al4高熵合金力学性能及腐蚀行为

Mechanical Properties and Corrosion Behavior of As Cast(Fe_(33)Cr_(36)Co_(15)Ni_(15)Ti_(1))_(96)Al_(4) High Entropy Alloy

利用经典高熵合金判据设计了一种非等摩尔比(Fe_(33)Cr_(36)Co_(15)Ni_(15)Ti_(1))_(96)Al_(4)高熵合金。利用X射线衍射仪、扫描电子显微镜、能谱仪、万能力学试验机和电化学工作站对合金的晶体结构、微观组织、元素分布、力学性能(压缩和拉伸性能)及腐蚀性能进行了研究。结果表明,(Fe_(33)Cr_(36)Co_(15)Ni_(15)Ti_(1))_(96)Al_(4)高熵合金为FCC+BCC双相结构,合金微观组织为枝晶组织,室温下合金抗压强度为743 MPa及超过50%的压缩应变,而拉伸屈服强度、抗拉强度、伸长率分别为591 MPa、984 MPa和15.8%,其断裂机制为韧性断裂。合金表现出优于304SS的耐蚀性,点蚀电位为846mV,约是304SS的三倍。

A non-equimolar ratio(Fe_(33)Cr_(36)Co_(15)Ni_(15)Ti_(1))_(96)Al_(4) high entropy alloy was designed by classical criterion of high entropy alloy.The crystal structure,microstructure,element distribution,mechanical properties(compressive and tensile properties)and corrosion properties of the alloy were analyzed by X-ray diffractometer,scanning electron microscope,energy dispersive spectrometer,universal mechanical testing machine and electrochemical workstation.The results show that the(Fe_(33)Cr_(36)Co_(15)Ni_(15)Ti_(1))_(96)Al_(4) high-entropy alloy exhibits the FCC+BCC dual-phase constituent with a typical dendritic structure.The compressive yield strength of the alloy at room temperature is 743 MPa and more than 50%compressive strain,while the tensile yield strength,fracture strength and tensile strain are 591 MPa,984 MPa and 15.8%,respectively.The fracture mechanism is ductile fracture.The corrosion risistance of the alloy is beter than that of 304SS,and the pitting potential of 846 mV is about three times than that of 304SS.