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Effect of twin boundary with/without segregation on deformation behavior in tension is examined using Mg-3Al-1Zn (AZ31) alloys from quasi-static strain rates to high strain rates. Solute atoms are segregated at{10\bar{1}2}{10
macr;2} twin boundaries by static annealing at a temperature of 423 K with a holding time of 150 min. The room-temperature tensile mechanical response of the alloys, which have pre-induced twin boundaries, shows detwinning behavior, regardless of the strain rate between 10-4 /s and 100 /s. The yield strength of these alloys is also unlikely to be affected by strain rate, because twin boundary mobility, i.e., shrinkage, is an athermal process. On the other hand, the alloy with segregated twin boundaries exhibits an increased strength and a decreased strain hardening compared with those in the alloy with non-segregated twin boundaries. Newly formed deformation twins of several types, i.e., the {10\bar{1}2} twins, {10\bar{1}1} twins and {10\bar{1}2}-{10\bar{1}1} double twins, are the origin of fracture in these alloys.

Rights:

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

Keyword: Magnesium alloy, Twin boundary, Segregation, High strain rate, Mechanical property, Deformation mechanism

Date published: 2024-03-01

Publisher: Elsevier BV

Journal:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 897 146319

Funding:

• Iketani Science and Technology Foundation 0351195-A
• National Institute for Materials Science
• Japan Society for the Promotion of Science 22K04747

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4902

First published URL: https://doi.org/10.1016/j.msea.2024.146319

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Updated at: 2024-10-28 11:30:26 +0900

Published on MDR: 2026-03-24 08:25:09 +0900