Abstract In this work, we investigated the three-point bending fatigue behavior of a brittle Ti32.8Zr30.2Ni5.3Cu9Be22.7 MG (ZT3) combined with damage morphology observation using scanning electron microscope. It is found that the brittle ZT3 MG possesses the excellent fatigue resistance with the fatigue endurance limit of ~527 MPa based on stress amplitude, and the fatigue ratio of ~0.29 termed as fatigue endurance limit divided by ultimate tensile strength, respectively. The superior fatigue property of ZT3 MG is mainly clarified based on shear-banding mechanism. The embrittlement suppresses shear band formation before fatigue crack initiation, probably delaying the fatigue crack initiation; the profuse shear bands as well as the staircase-like crack path during fatigue crack propagation further increases the resistance to fatigue damage and fracture. Besides, the fatigue behavior of ZT3 MG shows a lessened sensitivity to the defect, as evidenced by the slightly decreased fatigue lives and the low scatter of fatigue data in stress-life (S–N) curve. The ZT3 MG with excellent fatigue performance as well as high specific strength is expected to be a prime candidate material for structural applications in future.

中文翻译：

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钛基金属玻璃的高疲劳耐久极限

摘要 在这项工作中，我们研究了脆性Ti32.8Zr30.2Ni5.3Cu9Be22.7 MG (ZT3) 的三点弯曲疲劳行为，并结合使用扫描电子显微镜的损伤形貌观察。发现脆性 ZT3 MG 具有优异的抗疲劳性，基于应力幅的疲劳耐久极限为~527 MPa，疲劳比为~0.29，分别称为疲劳耐久极限除以极限抗拉强度。ZT3 MG优越的疲劳性能主要是基于剪切带机制来阐明的。脆化在疲劳裂纹萌生之前抑制了剪切带的形成，可能延迟了疲劳裂纹的萌生；疲劳裂纹扩展过程中大量的剪切带以及阶梯状裂纹路径进一步增加了抗疲劳损伤和断裂的能力。此外，ZT3 MG 的疲劳行为对缺陷的敏感性降低，这可以从疲劳寿命略有下降和应力-寿命 (S-N) 曲线中疲劳数据的低分散性证明。ZT3 MG 具有优异的疲劳性能和高比强度，有望成为未来结构应用的主要候选材料。