Evading strength-corrosion tradeoff in Mg alloys via dense ultrafine twins

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Changjian Yan
  • Yunchang Xin
  • Xiao-Bo Chen
  • Daokui Xu
  • Chaoqiang Liu
  • Bo Guan
  • Xiaoxu Huang
  • Qing Liu

Detail(s)

Original languageEnglish
Article number4616
Journal / PublicationNature Communications
Volume12
Online published29 Jul 2021
Publication statusPublished - 2021

Link(s)

Abstract

Conventional ultrafine-grains can generate high strength in Mg alloys, but significant tradeoff of corrosion resistance due to inclusion of a large number of non-equilibrium grain boundaries. Herein, an ultrafine-grain structure consisting of dense ultrafine twins is prepared, yielding a high strength up to 469 MPa and decreasing the corrosion rate by one order of magnitude. Generally, the formation of dense ultrafine twins in Mg alloys is rather difficult, but a carefully designed multi-directional compression treatment effectively stimulates twinning nucleation within twins and refines grain size down to 300 nm after 12-passes compressions. Grain-refinement by low-energy twins not only circumvents the detrimental effects of non-equilibrium grain boundaries on corrosion resistance, but also alters both the morphology and distribution of precipitates. Consequently, micro-galvanic corrosion tendency decreases, and severe localized corrosion is suppressed completely. This technique has a high commercial viability as it can be readily implemented in industrial production.

Research Area(s)

Citation Format(s)

Evading strength-corrosion tradeoff in Mg alloys via dense ultrafine twins. / Yan, Changjian; Xin, Yunchang; Chen, Xiao-Bo et al.
In: Nature Communications, Vol. 12, 4616, 2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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