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The effect of p-block elements (Ga, Ge and In) addition on grain boundary structures and room temperature mechanical responses was investigated on extruded Mg binary alloys with fine-grained structures. Grain boundary segregation was confirmed in the Mg-Ga and Mg-In alloys, whereas the Mg-Ge alloy did not show such microstructures associated with solubility. Grain boundary segregation affected the plastic deformation of the Mg-Ga and Mg-In alloys. In particular, the Mg-In alloy had a large strain rate dependency and exhibited good deformability at low strain rate regimens. First-principles calculations indicated that p-block elements produce a bond-weakening effect at grain boundaries, and atomistic distances at grain boundaries varies according to each element. Solute atom which brings about both bond-weakening and bond-expansion effects to Mg atoms is effective in enhancing the contribution of grain boundary sliding in deformation.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Magnesium alloy, Grain boundary segregation, First-principles calculation, Deformation mechanism

Date published: 2024-01-01

Publisher: Elsevier BV

Journal:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 893 146066

Funding:

• JSPS Grant-in-Aid No. 22H01762
• JSPS Grant-in-Aid No. 22K04747
• JST FOREST No. JPMJFR213P

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4895

First published URL: https://doi.org/10.1016/j.msea.2023.146066

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Updated at: 2024-10-25 10:02:38 +0900

Published on MDR: 2026-01-02 17:31:03 +0900