Unraveling and Mapping the Mechanisms for Near-Surface Microstructure Evolution in CuNi Alloys under Sliding

被引:37
作者
Eder, Stefan J. [1 ,2 ]
Ripoll, Manel Rodriguez [1 ]
Cihak-Bayr, Ulrike [1 ]
Dini, Daniele [3 ]
Gachot, Carsten [2 ]
机构
[1] AC2T Res GmbH, A-2700 Wiener Neustadt, Austria
[2] TU Wien, Inst Engn Design & Prod Dev, A-1060 Vienna, Austria
[3] Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England
基金
英国工程与自然科学研究理事会;
关键词
deformation mechanism map; microstructure evolution; fcc alloys; sliding contact; large-scale molecular dynamics; STACKING-FAULT ENERGY; NANOCRYSTALLINE NI-W; FCC METALS; WEAR; DEFORMATION; SIMULATIONS; FRICTION; BEHAVIOR; STRESS; BOUNDARIES;
D O I
10.1021/acsami.0c09302
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The origin of friction and wear in polycrystalline materials is intimately connected with their microstructural response to interfacial stresses. Although many mechanisms that govern microstructure evolution in sliding contacts are generally understood, it is still a challenge to ascertain which mechanisms matter under what conditions, which limits the development of tailor-made microstructures for reducing friction and wear. Here, we shed light on the circumstances that promote plastic deformation and surface damage by studying several face-centered cubic CuNi alloys subjected to sliding with molecular dynamics simulations featuring tens of millions of atoms. By analyzing the depth- and time-dependent evolution of the grain size, twinning, shear, and stresses in the aggregate, we derive a deformation mechanism map for CuNi alloys. We verify the predictions of this map against focused ion beam images of the near-surface regions of CuNi alloys that were experimentally subjected to similar loading conditions. Our results may serve as a tool for finding optimum material compositions within a specified operating range.
引用
收藏
页码:32197 / 32208
页数:12
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