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Coherent interface strengthening of ultrahigh pressure heat-treated Mg-Li-Y alloys.

Zhang, Shun; Sun, Yong; Wu, Ruizhi; Wang, Xiang; Chen, Xiao-Bo; Fernandez, Carlos; Peng, Qiuming

Authors

Shun Zhang

Yong Sun

Ruizhi Wu

Xiang Wang

Xiao-Bo Chen

Carlos Fernandez

Qiuming Peng



Abstract

Achieving good strength-ductility of Mg alloys has always been a crucial issue for the widespread applications of Mg-based structural materials. Herein, an unexpected double-stage strengthening phenomenon was discovered in Mg-8Li-1Y(wt.%) alloys through high pressure (6 GPa) heat treatments over a range of 700-1300°C. Attractively, the yield strength values are improved remarkably without losing their ductility. The low temperature strengthening mechanism is mainly driven by the formation of large-volume nanoscale contraction twins. In contrast, the high-temperature strengthening reason is ascribed to the presence of densely nano-sized stacking faults. Both coherent interfaces contribute effectively to high mechanical strength without any tradeoff in ductility.

Journal Article Type Letter
Publication Date Aug 15, 2020
Journal Journal of materials science and technology
Print ISSN 1005-0302
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 51
Pages 79-83
Institution Citation ZHANG, S., SUN, Y., WU, R., WANG, X., CHEN, X.-B., FERNANDEZ, C. and PENG, Q. 2020. Coherent interface strengthening of ultrahigh pressure heat-treated Mg-Li-Y alloys. Journal of materials science and technology [online], 51, pages 79-83. Available from: https://doi.org/10.1016/j.jmst.2020.02.039
DOI https://doi.org/10.1016/j.jmst.2020.02.039
Keywords Mg alloys; Nano-twins; Stacking faults; Strengthening
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