退火温度对铝钛强韧的CrCoNi中熵合金组织与性能的影响  

Effect of annealing temperature on microstructure and properties of Al⁃Ti toughened CrCoNi medium⁃entropy alloy

作　　者：许双辉 何国爱 Xu Shuanghui;He Guoai(Light Alloy Research Institute,Central South University,Changsha Hunan 410083,China;State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha Hunan 410083,China;Hunan Inno China Advanced Materials Co.,Ltd.,Yueyang Hunan 414000,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学极端服役性能精准制造全国重点实验室,湖南长沙410083 [3]湖南中创空天新材料股份有限公司,湖南岳阳414000

出　　处：《金属热处理》2024年第1期142-147,共6页Heat Treatment of Metals

摘　　要：通过电子背散射衍射(EBSD)和维氏硬度测试,研究不同退火温度下新型铝钛强韧的CrCoNi中熵合金组织演变规律和硬度变化。结果表明,退火温度较高(1100℃)时,合金的退火孪晶密度较高,且孪晶形貌更加平直规整;再结晶和晶粒长大和退火温度并非简单的线性关系,超过临界温度合金再结晶和晶粒长大过程明显加快,在1100℃下退火1 h可得到平均晶粒尺寸20.89μm的等轴晶组织,由于加工应力释放,合金硬度下降到302.9 HV0.2。By electron backscattering diffraction(EBSD)and Vickers hardness test,the microstructure evolution low and hardness change of Al⁃Ti toughened medium⁃entropy alloy annealed at different temperatures were studied.The results show that when the annealing temperature is higher(1100℃),the density of annealed twins is higher,the twin morphology is more straight and regular.The relationship of recrystallization and grain growth and annealing temperature is not simple linear.When the annealing temperature exceeds the critical temperature,the processes of recrystallization and grain growth are accelerated obviously.When annealed at 1100℃for 1 h,the equiaxial grains with average size of 20.89μm are obtained,and the hardness of the alloy decreases to 302.9 HV0.2 due to the stress release.

关 键 词：中熵合金 退火孪晶 晶粒尺寸 再结晶 硬度 

分 类 号：TG156.21[金属学及工艺—热处理]