Microstructure and mechanical properties of Mg-Zn-Gd-based alloys strengthened with quasicrystal and Laves phase

摘要：

One kind of Mg3.5Zn0.6Gd-based alloy strengthened with quasicrystals was designed,and the effect of alloying elements on microstructure and mechanical properties of as-cast Mg-Zn-Gd alloy at room temperature and elevated temperatures were studied.The results indicate that MgZnCu Laves phase,which coexists with quasicrystal at grain boundary,emerges with the addition of copper element in Mg-Zn-Gd alloy.The strength of alloys exhibits the parabola curve with the increase of copper content.The alloy with 1.5％ (mole fraction) Cu shows better mechanical properties at room temperature: tensile strength 176 MPa,yield strength 176 MPa and elongation 6.5％.The existence of MgZnCu Laves phase can effectively improve the heat resistance and elevated temperature properties of the alloy.The alloy with 1.5％ Cu has better mechanical properties at 200 : tensile strength 130 ℃ MPa and elongation 18.5％.The creep test of the alloys at 200 and 50 ℃ MPa for 102 h indicates that Mg3.5Zn0.6Gd alloy reinforced with quasicrystal has better creep properties than AE42,which can be further improved with the introduction of Laves phase in the alloy.

关键词： Mg alloy Mg-Zn-Gd Laves phase quasicrystal mechanical properties

作者: LIU Yong YUAN Guang-yin LU Chen DING Wen-jiang

作者单位: National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shangh National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shangh

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）