Microstructure,mechanical properties and stretch formability of as-rolled Mg alloys with Zn and Er additions

• 作者: Ke Liu Jing-Tao Liang Wen-Bo Du Shu-Bo Li Zhao-Hui Wang Zi-Jian Yu Jin-Xue Liu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 2179-2187
• 页数: 9页
• 语种: 英文

摘要

The magnesium alloy has a unique advantage in 3C fields due to its high specific strength and excellent electromagnetic shielding characteristic.However,it is difficult to deform homogeneously because of hexagonal close-packed structure.In the present work,the microstructure,mechanical properties and stretch forma-bility of magnesium alloy sheets with different alloying elements were investigated.It was indicated that a trace addition of Zn or/and Er made a key role in modifying texture,activating shear bands formation and precipitating nanoscale second phases,respectively,which resulted in an obvious improvement in both stretch formability and mechanical properties.The results suggested that the Mg-0.5Zn-0.5Er alloy sheet exhibited higher tensile strength along the rolling direction,i.e.,yield strength of 180 MPa and ultimate tensile strength of 201 MPa,accompanying with superior Erichsen value of 7.0 mm at room tempera-ture.The good performances of the sheet were ascribed to weakening basal texture intensity,formation of shear bands and precipitation of nanoscale W-phase (Mg3Zn3Er2).