Portal de Periódicos da CAPES

Enhanced fatigue endurance of metallic glasses through a staircase-like fracture mechanism

2013; National Academy of Sciences; Volume: 110; Issue: 46 Linguagem: Inglês

10.1073/pnas.1317715110

1091-6490

Bernd Gludovatz, Marios D. Demetriou, Michael Floyd, Anton Hohenwarter, William L. Johnson, Robert O. Ritchie,

Aluminum Alloys Composites Properties

Significance We believe this article is of broad interest to the materials science and engineering community. Bulk-metallic glasses (BMGs) are currently considered candidate materials for numerous structural applications. A major limitation in their use as engineering material is the often poor and inconsistent fatigue behavior. Although recently developed BMG composites provide one solution to this problem, fatigue remains a main issue for monolithic metallic glasses. The authors report unexpectedly high fatigue resistance in a monolithic Pd-based glass arising from extensive shear-band plasticity, resulting in a very rough and periodic “staircase” crack trajectory. The research both reveals a unique mechanism in fatigue of a monolithic metallic glass and demonstrates that this mechanism mitigates previous limitations on its use as an engineering material.