退火工艺对CoCr_(0.4)NiSi_(0.5)中熵合金组织和力学性能的影响  

Effect of annealing process on microstructure and mechanical properties of CoCr_(0.4)NiSi_(0.5)medium entropy alloy

作　　者：张昊 张伟强[1] 张丽 张力文 魏韬 Zhang Hao;Zhang Weiqiang;Zhang Li;Zhang Liwen;Wei Tao(School of Materials Science and Engineering,Shenyang Ligong University,Shenyang Liaoning 110159,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159

出　　处：《金属热处理》2024年第10期156-161,共6页Heat Treatment of Metals

基　　金：辽宁省教育厅基本科研项目(LJKMZ20220592)。

摘　　要：采用真空悬浮熔炼制备了CoCr_(0.4)NiSi_(0.5)中熵合金,研究了退火工艺(退火温度1000℃、1200℃,保温时间1h)对合金组织和性能的影响。结果表明,退火处理合金的相结构较铸态没有发生改变,仍为面心立方结构固溶体,显微组织仍为典型的枝晶组织,枝晶间分布着片层状的共晶组织,且枝晶内析出了少量的富Cr相颗粒。退火处理合金的硬度降低,退火温度较高时,硬度下降明显,这是由于退火温度高,枝晶间共晶组织增多,树枝晶长大,σ相含量减少导致。退火处理后,合金的压缩性能有明显改善,压缩屈服强度和压缩率上升,抗压强度下降。CoCr_(0.4)NiSi_(0.5)medium entropy alloy was prepared by vacuum suspension melting,and the effect of annealing process(annealing temperature of 1000℃,1200℃,and holding time of 1 h)on microstructure and properties of the alloy was investigated.The results show that the phase structure of the annealed alloy is still a face-centered cubic solid solution compared to the as-cast alloy,and the microstructure is still a typical dendrite structure,with lamellar eutectic structure distributed among the dendrites,and a small amount of Cr-rich particles are precipitated in the dendrites.The hardness of the annealed alloy decreases,and decreases obviously when the annealing temperature is high,which is caused by the increase of interdendrite eutectic structure,the growth of dendrite and the decrease of phase content.After annealing treatment,the compression properties of the alloy are obviously improved,the compression yield strength and compression rate are increased,but the compression strength is decreased.

关 键 词：CoCr_(0.4)NiSi_(0.5)中熵合金 退火工艺 显微组织 硬度 压缩性能 

分 类 号：TG156.1[金属学及工艺—热处理]