兰州理工大学学报 ›› 2026, Vol. 52 ›› Issue (3): 1-7.

• 材料科学与工程 •    下一篇

CoCrMo合金成分优化和变形机制分子动力学模拟

刘芬霞1, 贾金凤*2, 卢苏君3, 任军强4, 刘俊钊4   

  1. 1.广西科技师范学院, 广西 来宾 545004;
    2.兰州信息科技学院, 甘肃 兰州 730300;
    3.镍钴共伴生资源开发与综合利用全国重点实验室, 甘肃 金昌 737100;
    4.兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室, 甘肃 兰州 730050
  • 收稿日期:2026-01-08 出版日期:2026-06-28 发布日期:2026-06-30
  • 通讯作者: 贾金凤(1985-),女,河南周口人,副教授.Email:lois_jia@126.com
  • 基金资助:
    甘肃省高校教师创新基金(2026B-377)

Composition optimization and deformation mechanism of CoCrMo alloy by molecular dynamics simulation

LIU Fen-xia1, JIA Jin-feng2, LU Su-jun3, REN Jun-qiang4, LIU Jun-zhao4   

  1. 1. Guangxi Science & Technology Normal University, Laibin 545004, China;
    2. Lanzhou College of Information Science and Technology, Lanzhou 730300, China;
    3. National Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utilization, Jinchang 737100, China;
    4. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2026-01-08 Online:2026-06-28 Published:2026-06-30

摘要: 基于分子动力学方法构建了不同组分的CoCrMo合金模型,系统分析了合金成分对层错能和晶格常数的影响,并建立了最优合金的选取标准.结果表明:随着Mo含量的增加,CoCrMo合金的晶格常数呈现单调递增趋势;而当Mo含量恒定时,Cr含量的变化对晶格常数影响不显著.Mo元素含量的增加可显著提高CoCrMo合金的剪切模量,同时降低其内禀型层错能,从而有效改善合金的综合性能.通过成分优化确定的最优组分Co70Cr26Mo4合金在拉伸过程中表现出以禀型层错、外禀型层错和相变为主的塑性变形机制.

关键词: CoCrMo合金, 成分优化, 分子动力学模拟, 层错

Abstract: Molecular dynamics simulations were employed to construct CoCrMo alloy models with varying compositions, systematically investigating the effects of composition on stacking fault energy and lattice constant.Based on compositional optimization, criteria for selecting the optimal alloy composition were established.The results indicated that the lattice constant of the CoCrMo alloy increases monotonically with Mo content.When Mo content is held constant, variations in Cr content show no significant effect on the lattice constant.Furthermore, increasing Mo content markedly enhances the shear modulus of the alloy while reducing its intrinsic stacking fault energy, thereby improving the overall mechanical performance.The optimized alloy composition, Co70Cr26Mo4, exhibits a plastic deformation mechanism dominated by intrinsic stacking faults, extrinsic stacking faults, and phase transformation during tensile loading.

Key words: CoCrMo alloy, composition optimization, molecular dynamic simulation, stacking fault

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