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

• 作者: Shun Zhang Yong Sun Ruizhi Wu Xiang Wang Xiao-Bo Chen Carlos Fernandez Qiuming Pen
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（16）
• 页码范围: 79-83
• 页数: 5页
• 语种: 英文

摘要

Achieving good strength-ductility of Mg alloys has always been a crucial issue for the widespread applica-tions 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 ℃.Attractively,the yield strength values are improved remarkably without losing their duc-tility.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.