Mechanical response in tension of twin-induced Mg alloys in wide strain rate regimes

Hidetoshi Somekawa; Rintaro Ueji; Alok Singh

doi:10.1016/j.msea.2024.146319

論文 Mechanical response in tension of twin-induced Mg alloys in wide strain rate regimes

Hidetoshi Somekawa (National Institute for Materials Science) ; Rintaro Ueji (National Institute for Materials Science) ; Alok Singh (National Institute for Materials Science)

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Hidetoshi Somekawa, Rintaro Ueji, Alok Singh. Mechanical response in tension of twin-induced Mg alloys in wide strain rate regimes. Materials Science and Engineering: A. 2024, 897 (), 146319. https://doi.org/10.1016/j.msea.2024.146319

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(abstract)

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}{10macr;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.

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