The fretting behaviors of a metastable β titanium alloy with three kinds of microstructures were studied. Special attentions have been paid to the underlying wear mechanism mediated by fretting conditions and microstructural features. The wear volume is more sensitive to the stroke amplitude rather than the normal loading. The mixed abrasive-adhesive wear is dominated in all fretting samples. The microstructural features make a significant contribution to the difference in the wear resistance and subsurface microstructure stability. Due to a large difference in the grain size and the ability of plastic deformation in adjacent grains, the SM (single-phase microstructure) sample is more favorable to initiation and propagation of cracks. The DM (duplex microstructure) and BM (basketweave microstructure) samples, however, have a high resistance ability to fretting wear and subsurface microstructure stability. This can be attributed to the large amounts of the β/α interfaces and the dispersed orientation distribution of α precipitates. The present work offers valuable experimental data for the prediction of fatigue life after fretting.

研究了具有三种显微组织的亚稳态β钛合金的微动磨损行为。特别关注由微动条件和微观结构特征介导的潜在磨损机制。磨损量对行程幅度比正常载荷更敏感。混合磨料 - 粘合剂磨损在所有微动样品中占主导地位。显微结构特征对耐磨性和亚表面微结构稳定性的差异有显着贡献。由于晶粒尺寸和相邻晶粒的塑性变形能力差异较大，SM（单相显微组织）样品更有利于裂纹的萌生和扩展。然而，DM（双相微结构）和 BM（篮式微结构）样品，具有高抗微动磨损能力和亚表面微观结构稳定性。这可以归因于大量的 β/α 界面和 α 析出物的分散取向分布。目前的工作为微动后疲劳寿命的预测提供了有价值的实验数据。