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

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.

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

• Journal Article Type: Letter
• Acceptance Date: Feb 18, 2020
• Online Publication Date: Mar 26, 2020
• Publication Date: Aug 15, 2020
• Deposit Date: Apr 27, 2020
• Publicly Available Date: Mar 27, 2021
• Journal: Journal of materials science and technology
• Print ISSN: 1005-0302
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 51
• Pages: 79-83
• DOI: https://doi.org/10.1016/j.jmst.2020.02.039
• Keywords: Mg alloys; Nano-twins; Stacking faults; Strengthening
• Public URL: https://rgu-repository.worktribe.com/output/899423