可控相干纳米沉淀法优化中熵合金的摩擦行为

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Modelling and Simulation in Materials Science and Engineering Pub Date : 2023-10-19 DOI:10.1088/1361-651x/ad04f2

Jiyun Kong, Qihong Fang, Jia Li

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引用次数: 0

摘要

近年来，FeCrNi中熵合金作为一种具有高硬度、高强度、良好延展性和耐磨性的新材料得到了广泛的研究。本文采用分子动力学模拟方法研究了沉淀体积分数对FeCrNi摩擦行为的影响。随着沉淀体积分数的增加，平均摩擦系数呈上升趋势。当析出物体积分数在2.33% ~ 3.10%之间时，经纳米刮擦后的FeCrNi的耐磨性得到增强。当析出物体积分数在2.33% ~ 3.10%之间时，法向力较大，说明一定的析出物体积分数会强化FeCrNi。低析出体积分数可以有效降低刮擦过程中的磨损体积和磨损速率，从而有效降低摩擦力和摩擦系数。位错与析出之间的相互作用是阻碍位错扩展的重要因素，导致试样强化，磨损体积增大，表现为法向力和摩擦力的增大。研究结果对多次析出对FeCrNi摩擦性能和析出-位错相互作用的影响具有指导意义。

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Optimizing the friction behavior of medium entropy alloy via controllable coherent nanoprecipitation

Abstract In recent years, FeCrNi medium entropy alloy, a new material with high hardness, high strength, good ductility and wear resistance, has been widely studied. In this work, the effect of precipitation volume fraction on the friction behavior of FeCrNi is studied by molecular dynamics simulation. With the increase of precipitation volume fraction, the average friction coefficient shows an upward trend. When the volume fraction of precipitation is between 2.33% and 3.10%, the wear resistance of FeCrNi would be enhanced after the nanoscratching. When the volume fraction of precipitation is between 2.33% and 3.10%, the normal force is larger, which means that a certain precipitation volume fraction will strengthen FeCrNi. Low precipitation volume fraction can effectively reduce the wear volume and wear rate during scratching, thus effectively reducing frictional force and friction coefficient. The interaction between dislocation and precipitation is an important factor that hinders dislocation propagation, leading to sample strengthening and the increase of wear volume, which is manifested as the increase of normal force and frictional force. The results guide the study of the effect of multiple precipitation on frictional properties and precipitation-dislocation interaction in FeCrNi.

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来源期刊

Modelling and Simulation in Materials Science and Engineering 工程技术-材料科学：综合

CiteScore

3.30

自引率

5.60%

发文量

审稿时长

1.7 months

期刊介绍： Serving the multidisciplinary materials community, the journal aims to publish new research work that advances the understanding and prediction of material behaviour at scales from atomistic to macroscopic through modelling and simulation. Subject coverage: Modelling and/or simulation across materials science that emphasizes fundamental materials issues advancing the understanding and prediction of material behaviour. Interdisciplinary research that tackles challenging and complex materials problems where the governing phenomena may span different scales of materials behaviour, with an emphasis on the development of quantitative approaches to explain and predict experimental observations. Material processing that advances the fundamental materials science and engineering underpinning the connection between processing and properties. Covering all classes of materials, and mechanical, microstructural, electronic, chemical, biological, and optical properties.