高性能镁合金Mg-Dy-Gd-Zr微观组织及力学性能研究  

Research on Microstructure and Mechanical Properties of High Performance Mg-Dy-Gd-Zr Alloy

作　　者：任峻[1] 马颖[2] 陶钦贵[1] 

机构地区：[1]宜宾学院计算物理四川省高校重点实验室,四川宜宾644007 [2]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2015年第20期195-197,共3页Hot Working Technology

基　　金：四川省教育厅重点项目(12ZA202)

摘　　要：以高性能镁合金Mg-Dy-Gd-Zr为研究对象,对含不同含量镝(Dy)和钆(Gd)稀土元素的两种镁合金Mg-8Dy-2Gd-0.2Zr(DG82K)、Mg-2Dy-8Gd-0.2Zr(DG28K),在不同热处理下的微观组织和力学性能进行试验分析。结果表明:镁合金微观组织为均匀分布的等轴颗粒,晶粒比较细小,合金晶粒尺寸60μm左右;随Dy元素含量增加和Gd元素含量减小,合金微观组织中α-Mg相增加,第二相却减小,且合金维氏硬度也减小;随时效时间延长,DG28K合金维氏硬度呈现先增加后减小趋势,而DG82K合金维氏硬度呈现先增加后减小再增加最后减小趋势;经T4热处理DG82K、DG28K合金抗拉屈服强度和极限抗拉、抗压强度都减小,而抗压屈服强度和伸长率都增加,而DG82K、DG28K合金压缩率分别呈现减小和增加趋势。High performance Mg-Dy-Gd-Zr alloy was regarded as the research object, microstructure and mechanical properties of two kinds of Mg-8Dy-2Gd-0.2Zr（DG82K）, Mg-2Dy-8Gd-0.2Zr（DG28K） with different content rare earth elements of dysprosium（Dy） and gadolinium（Gd） were analyed through experiment under different heat treatment. The results show that the microstructure of magnesium alloy appears uniform distribution of axis particles, and grain size is small. Alloy grain sizes are all around 60 μm. As Dy elements increasing and Gd element decreasing, the microstructure of α-Mg phase in the alloy is increased, the second phase is reduced, and vickers hardness of the alloy is decreased; with the increase of aging time, the vickers hardness of DG28 K alloy is first increased then decreased, and the vickers hardness of DG82 K alloy is the trend of first increased and decreasing then increased and the last decreasing. After T4 heat treatment, the tensile yield strength, ultimate tensile and compressive strength of DG82 K, DG28 K alloy are reduced, and the compressive yield strength and elongation of DG82 K, DG28 K alloy are increased, while the compression ratio of DG82 K, DG28 K alloy shows a trend of decrease and increase respectively.

关 键 词：高性能镁合金 热处理 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]