The origin of high-density dislocations in additively manufactured metals
| Autor: | Ge Wang, Heng Ouyang, Chen Fan, Qiang Guo, Zhiqiang Li, Wentao Yan, Zan Li |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Materials Research Letters, Vol 8, Iss 8, Pp 283-290 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2166-3831 21663831 |
| DOI: | 10.1080/21663831.2020.1751739 |
| Popis: | The origin of dense dislocations in many additively manufactured metals remains a mystery. We here employed pure Cu as a prototype and fabricated the very challenging high-purity (>99.9%) bulk Cu by laser powder-bed-fusion (L-PBF) technique. We found that high-density dislocations were present in the as-built samples and these high-density dislocations were introduced on the fly during the L-PBF process. A newly developed multi-physics modeling was further employed to interpret the origin of these pre-existing dislocations, demonstrating that the compression-tension cycles rendered by the localized heating/cooling heterogeneity upon laser scanning are responsible for the residual high-density dislocations. |
| Databáze: | Directory of Open Access Journals |
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