退火对Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)高熵合金微观组织及硬度的影响  

Effect of annealing on microstructure and hardness of Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5) high entropy alloys

作　　者：刘静[1] 赵科 王丽阁[1] Liu Jing;Zhao Ke;Wang Lige(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang Sichuan 621010,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010

出　　处：《金属热处理》2024年第8期94-101,共8页Heat Treatment of Metals

基　　金：四川省自然科学基金(2022NSFSC1999);西南科技大学自然科学基金(20zx7106)。

摘　　要：选用Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)(x=7,11,15)高熵合金作为研究对象(分别记为Co_(7)HEA、Co_(11)HEA和Co_(15)HEA),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,Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)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。Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)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Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)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℃×12 h退火时硬度为422.4 HV0.3;Co_(11)HEA合金在800℃×12 h退火时硬度为778.3 HV0.3;Co_(15)HEA合金在800℃×8 h退火时硬度为325.8 HV0.3。当退火温度达到1000℃,Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)合金会发生不同程度的再结晶。Taking Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5)(x=7,11,15)high entropy alloys as the research object(named as Co_(7)HEA,Co_(11)HEA and Co_(15)HEA,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 Co_(7)HEA alloy and Co_(11)HEA alloy is 422.4 HV0.3 and 778.3 HV0.3,respectively,while the hardness of the Co_(15)HEA alloy is 325.8 HV0.3 after annealing at 800℃for 8 h.When the annealing temperature reaches 1000℃,the Co_(x)Fe_(35)Mn_(25)Cr_(15)Ni_(10)Ti_(5) alloys undergo varying degrees of recrystallization.

关 键 词：CoxFeMnCrNiTi高熵合金 退火 微观组织 硬度 

分 类 号：TB31[一般工业技术—材料科学与工程]