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Dilute Mg alloys based upon earth abundant Al, Zn, and Ca (along with minor additions of Mn and Zr) exhibit attractive combinations of strength, ductility, and workability via high-speed extrusion. These alloys derive their strength from high number densities of ordered, single atomic layer Guinier-Preston (GP) zones. The present study explores the potential of two quaternary Mg-Zn-Ca-Zr (ZXK210 and ZXK310) alloys produced as sheet materials. The anisotropic plastic responses of the two alloys are described using an elasto-viscoplastic self- consistent (EVPSC) polycrystal plasticity model. Similar to what was observed in AXM alloys with Mg-Ca-Al GP zones, prismatic slip is more potently strengthened than basal slip. The Mg-Zn-Ca GP zones are found to be intrinsically stronger and have a higher antiphase domain boundary energy than the Mg-Al-Ca GP zones. Finally, it is shown that the ZXK alloys are immune from natural over-aging.

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• In Copyright
  

Keyword: strength modeling, age-hardening, crystal plasticity, G.P. zone, magnesium alloys

Date published: 2024-12-21

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 258 116514

Funding:

• Japan Society for the Promotion of Science JP21H01675
• Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101000
• Light Metal Educational Foundation
• National Science Foundation CMMI-1921926
• National Science Foundation 1922081

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5408

First published URL: https://doi.org/10.1016/j.scriptamat.2024.116514

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Updated at: 2025-04-08 13:16:02 +0900

Published on MDR: 2025-04-07 22:19:40 +0900