Microstructure and mechanical properties of Mg-4Zn-xGd(x=0,0.5,1,2)alloys

• 作者: Cui-ju Wang Jin-wen Kang Kai-bo Nie Kun-kun Deng Wei Liang Wei-guo Li
• 来源期刊: 镁合金学报(英文)
• 学科: 工学
• 关键词: Magnesium alloy Dynamic recrystallization Dynamic precipitation MICROSTRUCTURE Mechanical properties
• 年，卷（期）: mhjxbyw,（2）
• 页码范围: 441-451
• 页数: 11页
• 分类号: TG1

摘要

The present work inainly focuses on tlie effect of minor cofiteut of Gd cicmcnt on the micrGstmcturc and mechanical properties of Mg Zn alloy.The Mg-4Zn-xGd(x=0,0.5,1,2)alloys were fabricated and subjected to extrusion at 280℃ with the ratio of 25:1.Results revealed that the addition of Gd could inhibit the dynamic recrystallization(DRX)of Mg-4Zn alloy,and both the size and volume fraction of DRXed grains demonstrated a decreasing tendency as the Gd content increased from 0.5 to 2 wt.%.It is the weakening effect on DRX behavior that lead to the smaller amount of fine precipitate and the stronger texture intensity.As compared with the Mg-4Zn alloy,the yield strength and ultimate tensile strength of Mg-4Zn-xGd alloys were improved obviously by the addition of minor content of Gd,however,at the expense of elongation.Excellent tensile properties with the yield strength of〜369.8 MPa and ultimate tensile strength of〜400.3 MPa were obtained when the Gd content was 2 wt.%.