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

Changjian Yan, Yunchang Xin (), Xiao-Bo Chen, Daokui Xu (), Paul K. Chu, Chaoqiang Liu, Bo Guan, Xiaoxu Huang and Qing Liu
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Changjian Yan: Nanjing Tech University
Yunchang Xin: Nanjing Tech University
Xiao-Bo Chen: RMIT University
Daokui Xu: Chinese Academy of Sciences
Paul K. Chu: City University of Hong Kong
Chaoqiang Liu: Central South University
Bo Guan: Chongqing University
Xiaoxu Huang: Chongqing University
Qing Liu: Nanjing Tech University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-24939-3

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