冷轧和退火对Ni_(40)(FeCoCrAl)_(60)高熵合金组织与性能的影响

Effects of Cold Rolling and Heat Treatment on Microstructure and Properties of Ni_(40)(FeCoCrAl)_(60) High-entropy Alloy

研究了高温退火和二次退火对冷轧后Ni_(40)(FeCoCrAl)_(60)高熵合金组织和性能的影响。结果表明,铸态合金由FCC+BCC双相组成。冷轧并再结晶后,合金保持稳定的相结构,FCC相由树枝晶转变为等轴晶,BCC相位于FCC相之间和FCC相之内。铸态合金的屈服强度和抗拉强度分别为450 MPa和870 MPa,伸长率为40%。室温冷轧后合金强度显著升高,屈服强度和抗拉强度分别是铸态合金的2.9倍和1.7倍,伸长率降至4%。再结晶退火使屈服强度和抗拉强度分别降为590 MPa和820 MPa,伸长率为12%。

Effects of high temperature annealing and secondary annealing on the microstructure and properties of cold-rolled Ni_(40)(FeCoCrAl)_(60) high entropy alloy were investigated.The results indicate that the as-cast alloy is composed of FCC+BCC double phase.After cold rolling and recrystallization,the phase structure of the alloy keeps stable,where FCC phase is converted from dendrite to equiaxed crystal,and BCC phase is located between FCC phases or within FCC phase.The yield strength,and maximum tensile strength and elongation of as-cast alloy reach 450 MPa,870 MPa,and 40%,respectively.After cold rolling,strength of the alloy is significantly enhanced,where the yield strength,and maximum tensile strength are 2.9 times and 1.7 times of the as-cast one,and elongation is reduced to 4%.The yield strength,maximum tensile strength and elongation are reduced to 590 MPa,820 MPa and 12%,respectively,by recrystallization annealing.