铝硅合金中的纳米孪晶硅实现高耐磨性

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-09-05 DOI:10.1016/j.wear.2024.205559
Tingting Niu , Lutong Zhou , Haidong Hu , Wei Gao , Yong Sun , Guodong Zou , Qun Zu , Houwen Chen , Peng Wang , Qiuming Peng
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引用次数: 0

摘要

在工程材料领域,磨损是动力传动部件最常见的损坏,约占使用损失的四分之一。开发高耐磨性铝合金对减少能源需求和减轻重量起着至关重要的作用,进而有助于实现双碳目标。在此,我们报告了一种在室温下开发优异耐磨性(摩擦系数为 0.31)Al-10 wt%Si 合金的新策略,其基础是通过超高压固溶和电脉冲辅助时效(HPEP)相结合的方法形成多个平行{111}孪晶和分层{111}-{111}双孪晶。通过透射电子显微镜观察、分子动力学模拟和第一性原理计算,阐明了纳米孪晶硅的微观结构、形成过程和耐磨机理。研究表明,交互式纳米孪晶硅结构主要是通过孪晶碰撞或相/基体界面禁止孪晶运动而引入的,与共晶硅完美晶体相比,它们能有效抑制原子分离,从而导致均匀的磨损失效和较长的工作寿命。这些新成果为设计具有高机械性能的耐磨材料提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nano-twinned silicon in Al-Si alloys for high wear-resistance

Nano-twinned silicon in Al-Si alloys for high wear-resistance

Wear-failure is the most common damage for power transmission components in the field of engineering materials, constituting approximately one-fourth in service loss. The development of high wear-resistant Al alloys plays a crucial role in reducing energy demand and weight, and then attributes to the achievement of dual-carbon target. Here we report a novel strategy to develop outstanding wear-resistant (the coefficient of friction of 0.31) Al-10 wt%Si alloys at room temperature, based on the formation of multiple parallel {111} twins and hierarchical {111}-{111} double twins by a route of combining ultrahigh pressure solid solution and electropulsing assisted aging (HPEP), which overwhelms all values of Al alloys, even Ti alloys and high entropy alloys reported so far. The microstructure, formation process and wear-resistant mechanism of nano-twinned Si have been clarified by transmission electron microscopy observations, molecule dynamics simulations and the first principles calculations. It demonstrates that the interactive nano-twinned Si structures are mainly introduced through twin-twin collision or the phase/matrix interface prohibition of twin motion, which are effective to restrain atom separation in contrast to eutectic Si perfect crystal, resulting in homogeneous wear-loss and long operation life. Those new results provide insights towards designing wear-resistant materials with high mechanical properties.

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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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