Abstract

The need for reducing the energy consumption and volume of materials used in the aerospace industry has been driving the further optimization of the behavior of TiAl alloy under friction and wear. Therefore, investigating the micro-/nanostructures of the wear scar cross sections when TiAl-Ag composites slide against an immobile Si₃N₄ ball should help to analyze the friction and wear behaviors. Plastic deformation was observed to occur in the cross sections of the analyzed wear scar during the initial −25 min of the experiments; consequently, a work-hardened layer formed, and the friction coefficient and wear rate rapidly decreased. During the 25-60 min interval, the wear debris was refined in succession and formed a lubrication film, and the friction resistance and material loss were reduced. During the 60-120 min interval, a remarkably large amount of Ag was determined to be well distributed across the wear scar. It coincided with excellent deformation; moreover, the friction coefficients and wear rates of the TiAl-10 wt.% Ag composites were low.

中文翻译：

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TiAl-Ag复合材料磨损痕的原位合成和截面演变分析

摘要

减少航空航天工业中能耗和材料体积的需求已推动进一步优化TiAl合金在摩擦和磨损下的性能。因此，研究TiAl-Ag复合材料在固定的Si ₃ N _4上滑动时磨损痕迹横截面的微观/纳米结构。球应有助于分析摩擦和磨损行为。在实验的最初-25分钟内，观察到了所分析的磨损痕迹的横截面中发生了塑性变形。因此，形成了加工硬化层，并且摩擦系数和磨损率迅速降低。在25至60分钟的间隔内，连续磨碎磨屑并形成润滑膜，从而降低了摩擦阻力和材料损失。在60-120分钟的间隔内，确定大量的Ag均匀分布在整个磨损痕迹上。它恰好具有出色的变形。此外，TiAl-10重量％Ag复合材料的摩擦系数和磨损率低。