退火对CoxFe35Mn25Cr15Ni10Ti5高熵合金微观组织及硬度的影响

doi:10.13251/j.issn.0254-6051.2024.08.015

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 94-101.DOI: 10.13251/j.issn.0254-6051.2024.08.015

退火对Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅高熵合金微观组织及硬度的影响

刘静, 赵科, 王丽阁

西南科技大学材料与化学学院, 四川绵阳 621010

收稿日期:2024-02-11 修回日期:2024-06-18 出版日期:2024-08-25 发布日期:2024-09-27
作者简介:刘静(1988—),女,博士,主要研究方向为高熵合金制备及表征,E-mail:jingliu@mail.ustc.edu.cn
基金资助:
四川省自然科学基金(2022NSFSC1999);西南科技大学自然科学基金(20zx7106)

Effect of annealing on microstructure and hardness of Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅ high entropy alloys

Liu Jing, Zhao Ke, Wang Lige

School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang Sichuan 621010, China

Received:2024-02-11 Revised:2024-06-18 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 选用Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅(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,Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅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_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅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_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅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;Co₁₁HEA合金在800 ℃×12 h退火时硬度为778.3 HV0.3;Co₁₅HEA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_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅合金会发生不同程度的再结晶。

关键词: Co_xFeMnCrNiTi高熵合金, 退火, 微观组织, 硬度

Abstract: Taking Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅ (x=7,11,15) high entropy alloys as the research object(named as Co₇HEA, Co₁₁HEA 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 Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅ alloys undergo varying degrees of recrystallization.

Key words: Co_xFeMnCrNiTi high entropy alloy, annealing, microstructure, hardness

中图分类号:

TB31

刘静, 赵科, 王丽阁. 退火对Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅高熵合金微观组织及硬度的影响[J]. 金属热处理, 2024, 49(8): 94-101.

Liu Jing, Zhao Ke, Wang Lige. Effect of annealing on microstructure and hardness of Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅ high entropy alloys[J]. Heat Treatment of Metals, 2024, 49(8): 94-101.

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退火对Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅高熵合金微观组织及硬度的影响

Effect of annealing on microstructure and hardness of Co_xFe₃₅Mn₂₅Cr₁₅Ni₁₀Ti₅ high entropy alloys

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