• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2025, Vol. 61 ›› Issue (11): 266-278.doi: 10.3901/JME.2025.11.266

• 摩擦学 • 上一篇    

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等比添加Co、Cu元素对FeCrNi合金纳米摩擦学性能及变形机理的影响研究

程巍1, 詹荔2, 刘秀波1, 周安1, 李明曦3, 贺泊铭1, 陈国栋1   

  1. 1. 中南林业科技大学材料表界面科学与技术湖南省重点实验室 长沙 410004;
    2. 南昌理工学院航天航空学院 南昌 330044;
    3. 湖南省农业装备研究所 长沙 410125
  • 收稿日期:2024-06-08 修回日期:2024-12-23 发布日期:2025-07-12
  • 作者简介:程巍,男,2000年出生。主要研究方向为表面工程与摩擦学。E-mail:chengwei0858@163.com;刘秀波(通信作者),男,1968年出生,博士,教授,博士研究生导师。主要研究方向为表面工程与摩擦学。E-mail:liuxiubosz@163.com;李明曦,男,1989年出生,硕士,助理研究员。主要研究方向为热喷涂技术在农机关键零部件表面的耐磨耐蚀应用。E-mail:327692776@qq.com
  • 基金资助:
    国家自然科学基金(52075559)、湖南省重点研发计划(2022GK2030)、湖南省农业科技创新资金(2023CX53)和中南林业科技大学研究生科技创新基金(2023CX02066,2023CX02076,2024CX02004)资助项目。

Effect of Adding Co and Cu Elements in Equal Proportion on Nano Tribological Properties and Deformation Mechanism of FeCrNi Alloy

CHENG Wei1, ZHAN Li2, LIU Xiubo1, ZHOU An1, LI Mingxi3, HE Boming1, CHEN Guodong1   

  1. 1. Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004;
    2. School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang 330044;
    3. Agriculture Equipment Institute of Hunan, Changsha 410125
  • Received:2024-06-08 Revised:2024-12-23 Published:2025-07-12

摘要: 采用分子动力学模拟和纳米划痕验证相结合的方法研究了FeCrNi (C1)、FeCoCrNi (C2)及FeCoCrNiCu (C3)三种合金在纳米摩擦过程中表面形貌、磨损原子数目、位错、剪切应变、摩擦力及摩擦系数等差异,进一步分析了等比添加Co、Cu元素对FeCrNi合金的纳米摩擦学性能及变形机理的影响。结果表明:三种合金摩擦产生的磨痕两侧会出现不对称的原子堆积,表明在摩擦过程中存在塑性形变和弹性恢复两种变形机制;纳米硬度大小关系为C2>C3>C1,由于纳米硬度和显微硬度测量时压头对位错的覆盖面不同,导致与显微硬度大小关系存在差异;C3合金HCP相分数最大,C2合金次之,C1合金最小,表明添加Co、Cu元素可以改变合金的原子间距、晶格常数和晶格畸变等参数,从而调节FCC相结构的稳定性,抑制FCC相结构向HCP结构的转变;多晶合金晶界影响合金位错生长和分布,C1合金位错受晶界影响很难突破晶界生长,因而在亚表面形核并沿着磨球滑动方向扩散;C2合金位错主要围绕晶界生长,C3合金位错主要分布在合金晶界处和磨痕亚表面。

关键词: FeCrNi合金, 纳米摩擦学性能, 分子动力学模拟, 纳米划痕

Abstract: The surface morphology, number of wear atoms, dislocation, shear strain, friction force, and friction coefficient of FeCrNi (C1), FeCoCrNi (C2), and FeCoCrNiCu (C3) alloys are studied by molecular dynamics simulation and nanoscratch verification. The effects of adding Co and Cu elements in equal proportion on the tribological properties and deformation mechanism of FeCrNi alloy are further analyzed. The results show that asymmetric atomic accumulation occurs on both sides of the friction marks of the three alloys, indicating that there are two deformation mechanisms: plastic deformation and elastic recovery. The relationship between nano hardness and microhardness is C2>C3>C1. Due to the different coverage of the indenter to the dislocation during the measurement of nano hardness and microhardness, the relationship between nano hardness and microhardness is different. The HCP phase fraction of C3 alloy is the largest, followed by C2 alloy and C1 alloy is the smallest, which indicates that adding Co and Cu elements can change the atomic distance, lattice constant, and lattice distortion of the alloy, thereby regulating the stability of FCC phase structure and inhibiting the transition from FCC phase structure to HCP structure. The dislocation distribution of polycrystalline alloys can be affected by grain boundaries. The dislocation growth and distribution of polycrystalline alloy are affected by grain boundaries. The dislocation of C1 alloy is difficult to break through the grain boundaries, so it nucleates on the subsurface and spreads along the sliding direction of the grinding ball. The dislocation of C2 alloy mainly grows around the grain boundary, and the dislocation of C3 alloy mainly distributes at the grain boundary and the wear subsurface.

Key words: FeCrNi alloy, nano-tribological properties, molecular dynamics simulation, nanoscratch

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