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
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|
|Peer Reviewed||Peer Reviewed|
|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|
|Keywords||Mg alloys; Nano-twins; Stacking faults; Strengthening|
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