High Ductility in a fully martensitic microstructure: a paradox in a Ti alloy produced by selective laser melting
| Autor: | A. Zafari, K. Xia |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Materials Research Letters, Vol 6, Iss 11, Pp 627-633 (2018) |
| Druh dokumentu: | article |
| ISSN: | 2166-3831 21663831 |
| DOI: | 10.1080/21663831.2018.1525773 |
| Popis: | A fully martensitic Ti alloy consisting entirely of hexagonal-close-packed α′ was produced by selective laser melting (SLM), exhibiting an impressive combination of high strength and excellent ductility. A small quantity of body-centred-cubic β formed at some large primary α′ plates oriented at ∼45° to the tensile direction was found responsible for early fracture owing to α′/β strain incompatibility. Properly selected SLM parameters resulted in a β-free microstructure containing α′/α′ interfaces only, preventing premature fracture. Consequently, large plastic deformation was enabled, creating randomly oriented nano-α′ crystals. The investigation dispels the myth that α′ is inherently brittle. |
| Databáze: | Directory of Open Access Journals |
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