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Achieving high strength and ductility in magnesium alloys via densely hierarchical double contraction nanotwins.

Fu, Hui; Ge, Bincheng; Xin, Yunchang; Wu, Ruizhi; Fernandez, Carlos; Huang, Jianyu; Peng, Qiuming

Authors

Hui Fu

Bincheng Ge

Yunchang Xin

Ruizhi Wu

Carlos Fernandez

Jianyu Huang

Qiuming Peng



Abstract

Light-weight magnesium alloys with high strength are especially desirable for the applications in transportation, aerospace, electronic components, and implants owing to their high stiffness, abundant raw materials, and environmental friendliness. Unfortunately, conventional strengthening methods mainly involve the formation of internal defects, in which particles and grain boundaries prohibit dislocation motion as well as compromise ductility invariably. Herein, we report a novel strategy for simultaneously achieving high specific yield strength (~160 kN m kg?1) and good elongation (~23.6%) in a duplex magnesium alloy containing 8 wt % lithium at room temperature, based on the introduction of densely hierarchical {lcub}1011{rcub}?{lcub}1011{rcub} double contraction nanotwins (DCTWs) and full-coherent hexagonal close-packed (hcp) particles in twin boundaries by ultrahigh pressure technique. These hierarchical nanoscaled DCTWs with stable interface characteristics not only bestow a large fraction of twin interface but also form interlaced continuous grids, hindering possible dislocation motions. Meanwhile, orderly aggregated particles offer supplemental pinning effect for overcoming latent softening roles of twin interface movement and detwinning process. The processes lead to a concomitant but unusual situation where double contraction twinning strengthens rather than weakens magnesium alloys. Those cutting-edge results provide underlying insights toward designing alternative and more innovative hcp-type structural materials with superior mechanical properties.

Journal Article Type Article
Publication Date Oct 11, 2017
Journal Nano letters
Print ISSN 1530-6984
Electronic ISSN 1530-6992
Publisher New Publisher Required
Peer Reviewed Peer Reviewed
Volume 17
Issue 10
Pages 6117-6124
Institution Citation FU, H., GE, B., XIN, Y., WU, R., FERNANDEZ, C., HUANG, J. and PENG, Q. 2017. Achieving high strength and ductility in magnesium alloys via densely hierarchical double contraction nanotwins. Nano letters [online], 17(10), pages 6117-6124. Available from: https://doi.org/10.1021/acs.nanolett.7b02641
DOI https://doi.org/10.1021/acs.nanolett.7b02641
Keywords Double contraction twinning; MgLi alloy; Nano twins; Ultrahigh pressure

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