退火对CoxFe35Mn25Cr15Ni10Ti5高熵合金微观组织及硬度的影响
Effect of annealing on microstructure and hardness of CoxFe35Mn25Cr15Ni10Ti5 high entropy alloys
刘静 1赵科 1王丽阁1
作者信息
- 1. 西南科技大学材料与化学学院,四川 绵阳 621010
- 折叠
摘要
选用CoxFe35Mn25Cr15Ni10Ti5(x=7,11,15)高熵合金作为研究对象(分别记为Co7HEA、Co11HEA和Co15HEA),采用金相显微镜、扫描电镜、X射线衍射仪和维氏硬度计等手段,研究了退火工艺对合金组织和硬度的影响.结果表明,随着Co元素的增加,CoxFe35Mn25Cr15Ni10Ti5合金组织中的黑色网状相和灰色相的相容性提高,进而在退火过程中产生析出强化和再结晶.CoxFe35Mn25Cr15Ni10Ti5合金退火后,Cr、Fe、Ni和Ti元素的分布较铸态分布的界限更为明显.退火态CoxFe35Mn25Cr15Ni10Ti5合金的最高硬度所对应的退火温度都集中在800℃,Co7HEA合金在800℃ × 12h退火时硬度为422.4 HV0.3;Co11HEA合金在800 ℃ × 12 h退火时硬度为778.3 HV0.3;Co15HEA合金在800 ℃ × 8h退火时硬度为325.8 HV0.3.当退火温度达到1000 ℃,CoxFe35Mn25Cr15Ni10Ti5合金会发生不同程度的再结晶.
Abstract
Taking CoxFe35 Mn25 Cr15 Ni10Ti5(x=7,11,15)high entropy alloys as the research object(named as Co7HEA,Co11 HEA and Co15HEA,respectively),the effect of annealing process on the microstructure and hardness was studied by means of metallographic microscope,scanning electron microscope,X-ray diffractometer and Vickers hardness tester.The results show that with the increase of Co element,the compatibility between the black network phase and the gray phase in the alloys is improved,leading to precipitation strengthening and recrystallization during annealing.After annealing,the distribution of Cr,Fe,Ni and Ti elements in the alloys is more pronounced than that in the as-cast.The annealing temperatures corresponding to the highest hardness of the annealed alloys are concentrated at 800℃.After annealing at 800℃ for 12 h,the hardness of the Co7HEA alloy and Co11HEA alloy is 422.4 HV0.3 and 778.3 HV0.3,respectively,while the hardness of the Co15HEA alloy is 325.8 HV0.3 after annealing at 800 ℃ for 8 h.When the annealing temperature reaches 1000 ℃,the CoxFe35Mn25Cr15Ni10Ti5 alloys undergo varying degrees of recrystallization.
关键词
CoxFeMnCrNiTi高熵合金/退火/微观组织/硬度Key words
CoxFeMnCrNiTi high entropy alloy/annealing/microstructure/hardness引用本文复制引用
基金项目
四川省自然科学基金(2022NSFSC1999)
西南科技大学自然科学基金(20zx7106)
出版年
2024
NETL
NSTL
万方数据