L1_(2)型纳米有序相析出强化(FeNiCoCr)_(93)Al_(5)Ti_(2)高熵合金  

L1_(2)-type Nano-ordered Precipitation Phase Reinforced(FeNiCoCr)_(93)Al_(5)Ti_(2)High Entropy Alloy

作　　者：王沛锦 卓家乐 艾桃桃[1,2] 董洪峰[1,2] WANG Peijin;ZHUO Jiale;AI Taotao;DONG Hongfeng(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,Shaanxi,China;National&Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology,Shaanxi University of Technology,Hanzhong 723000,Shaanxi,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000 [2]陕西理工大学矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中723000

出　　处：《材料导报》2024年第22期230-234,共5页Materials Reports

基　　金：陕西省自然科学基础研究计划项目(2023-JC-ZD-22)。

摘　　要：L1_(2)型纳米有序相析出强化面心立方结构高熵合金有望获得理想的强度-延性平衡。受此启发,本工作采用热压成形技术制备了一种L1_(2)型纳米有序相析出强化的(FeNiCoCr)_(93)Al_(5)Ti_(2)高熵合金。研究发现,该合金由FCC基体相、少量富Cr相及富Fe相组成,其中基体相晶粒内析出呈圆球状L1_(2)型结构的Ni_(3)(Al,Ti)颗粒,L1_(2)有序析出相与基体相呈共格关系。经估算,有序相强化对高熵合金屈服强度的贡献增量达221.0 MPa,远高于共格弥散强化和模量错配强化。(FeNiCoCr)_(93)Al_(5)Ti_(2)高熵合金具有优异的压缩性能,其工程屈服强度、压缩强度和压缩应变分别为717 MPa、2304 MPa和44%。High entropy alloys(HEAs)with face-centered cubic structure strengthened by L1_(2)-type nano-ordered precipitates can obtain ideal strength-ductility equilibrium.In the present study,(FeNiCoCr)_(93)Al_(5)Ti_(2)HEA reinforced by L1_(2)-type nano-ordered precipitation phase was prepared by hot pressing technique.It could be found that the alloy was consisted of FCC matrix phase,a small amount of Cr-rich phase,and Fe-rich phase.Spheroidal L1_(2)-type structured Ni_(3)(Al,Ti)particles were precipitated inside the matrix grains and had a coherent relationship with the matrix phase.It was estimated that the incremental contribution of ordered strengthening to the yield strength of the alloy was 221.0 MPa,which was much higher than that of the coherent dispersion strengthening and the modulus mismatch strengthening.The(FeNiCoCr)_(93)Al_(5)Ti_(2)HEA exhibited excellent compressive properties,as its engineered yield strength,compressive strength,and compressive strain were 717 MPa,2304 MPa,and 44%,respectively.

关 键 词：高熵合金 纳米析出相 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]