Incoherent tilt grain boundaries stabilized by stacking faults and solute-cluster segregation: a case-study of an Mg-Gd alloy
| Autor: | Zhengqing Liu, Qi Qian, Yong Jiang, Yiren Wang, Yuman Zhu, Jian-Feng Nie |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Materials Research Letters, Vol 8, Iss 7, Pp 268-274 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2166-3831 21663831 |
| DOI: | 10.1080/21663831.2020.1748734 |
| Popis: | Despite their wide presence in hcp metals, incoherent tilt grain boundaries (ITGBs) are rarely studied. In this work, first-principles calculations were combined with atomic-resolution HAADF-STEM analyses to investigate the structure and formation of one special type ITGB in an Mg-Gd alloy featured with a unique Gd-rich cluster segregation pattern. Our results suggested this ITGB as a mirror-glide boundary formed by gliding the atoms along [ $20\bar{2}\bar{1} $] of a { $10\bar{1}4 $}< $20\bar{2}\bar{1} $> coherent twin boundary due to its interaction with stacking faults. The ITGB can be further stabilized by partial-column Gd substitution, leading to the observed unique segregation pattern. |
| Databáze: | Directory of Open Access Journals |
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