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

doi:10.3901/JME.2025.11.266

Abstract

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

CLC Number:

TG156

CHENG Wei, ZHAN Li, LIU Xiubo, ZHOU An, LI Mingxi, HE Boming, CHEN Guodong. Effect of Adding Co and Cu Elements in Equal Proportion on Nano Tribological Properties and Deformation Mechanism of FeCrNi Alloy[J]. Journal of Mechanical Engineering, 2025, 61(11): 266-278.

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