Abstract

The urgency of development in the aviation industry has motivated further optimization of TiAl alloys with respect to friction and wear. In this paper, dendritic silver has been prepared to improve the behavior under friction and wear of TiAl-10 wt.%Ag (TA10A) printed via selective laser melting (SLM). Associated properties were examined using a ball-on-disk tribometer. A friction coefficient of 0.28 and wear rate of 1.51 × 10⁻⁴ mm³ N⁻¹ m⁻¹ were observed at 450 °C, both of which were lower than the values obtained at other temperatures. The relatively higher expansion coefficient at 450 °C was beneficial to the extraction of silver from TA10A, which accelerated the enrichment of silver on wear scar. Low tensile strength of silver makes it amenable to significant plastic deformation, and as a result, it can spread out easily over wear scars, and increase its area of distribution to form a silver-rich lubrication layer. The high plastic ductility of silver induced the lubrication layer to be well maintained during wear, resulting in a low friction coefficient and wear rate.

中文翻译：

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合成银以降低TiAl基复合材料的摩擦磨损的研究

摘要

航空工业发展的紧迫性促使TiAl合金在摩擦和磨损方面进一步优化。在本文中，已经制备了树枝状银，以改善通过选择性激光熔化（SLM）印刷的TiAl-10 wt％Ag（TA10A）在摩擦和磨损下的行为。使用圆盘摩擦计检查相关性能。摩擦系数为0.28，磨损率为1.51×10 ^-4  mm ³  N ^-1  m ^-1在450°C下观察到的温度均低于在其他温度下获得的值。450°C时相对较高的膨胀系数有利于从TA10A中提取银，从而加速了磨损痕迹上银的富集。银的低拉伸强度使其易于发生明显的塑性变形，结果，它很容易在磨损痕迹上散布开来，并增加了其分布面积，从而形成了富含银的润滑层。银的高塑性延展性促使润滑层在磨损过程中得到很好的维护，从而导致较低的摩擦系数和磨损率。