Annealing Softening Behavior of CuCrFeMnNi High-entropy Alloy via Vacuum Hot-pressing Sintering
CuCrFeMnNi high-entropy alloy was fabricated using vacuum hot pressing sintering process,and annealed at 600～900℃ for 12 h.The effects of annealing temperature on microstructure and microhardness of alloy were investi-gated by microhardness testing,phase analysis and microstructure observation.The results reveal that the sintered hardness of CuCrFeMnNi high-entropy alloy is around 543 HV,which is gradually decreased with the increase of annealing temperature.With annealing temperature of 900℃,the microhardness is decreased to 268 HV,which is about 52%times of the sintered one,indicating that the alloy undergoes significant annealing softening after high-temperature annealing treatment.XRD patterns demonstrate that the CuCrFeMnNi high-entropy alloy is transformed from a multiphase structure of sintered FCC main phase(FCC1+FCC2)+ρ phase to a single-phase structure of FCC2 phase.Therefore,the annealing softening is mainly attributed to the decomposition of ρ phase.
NETL
NSTL
万方数据
