Effect of Y addition on microstructure and mechanical properties of Mg-Zn-Mn alloy  

稀土Y对Mg-Zn-Mn镁合金显微组织和力学性能的影响(英文)

作　　者：齐福刚[1] 张丁非[2] 张孝华[1] 潘复生[2] 

机构地区：[1]中国工程物理研究院表面物理与化学重点实验室,绵阳621907 [2]重庆大学材料科学与工程学院,重庆400045

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1352-1364,共13页中国有色金属学报（英文版）

基　　金：Project(2007CB613700)supported by the National Basic Research Program of China;Project(2011BAE22B01-3)supported by the National Key Technologies R&D Program of China;Project(2010DFR50010,2008DFR50040)supported by the International Scientific and Technological Cooperation Program of Ministry of Science and Technology of China;Project(CSTC,2010AA4048)supported by Chongqing Science and Technology Commission,China

摘　　要：The effects of Y on the microstructure and mechanical properties of Mg-6Zn-lMn alloy were investigated. The results show that the addition of Y has significant effect on the phase composition, microstructure and mechanical properties of Mg-6Zn-lMn alloy. Varied phases compositions, including Mg7Zn3, I-phase （Mg3YZn6）, W-phase （Mg3Y2Zn3） and X-phase （MgI2YZn）, are obtained by adjusting the Zn to Y mass ratio. Mn element exists as the fine Mn particles, which are well distributed in the alloy. Thermal analysis and microstructure observation reveal that the phase stability follows the trend of X〉W〉/〉MgTZn3. In addition, Y can improve the mechanical properties of Mg-Zn-Mn alloy significantly, and the alloy with Y content of 6.09% has the best mechanical properties. The high strength is mainly due to the strengthening by the grain size refinement, dispersion strengthening by fine Mn particles, and introduction of the Mg-Zn-Y ternary phases.研究不同稀土Y含量对Mg-6Zn-1Mn合金显微组织和力学性能的影响。结果表明:Y元素的添加对Mg-6Zn-1Mn合金的相结构、组织和力学性能有明显的影响。随着Y含量的增加,合金中的第二相依次从Mg7Zn3相、I相(Mg3YZn6)、I相+W相(Mg3Y2Zn3)到W相+X相(Mg12YZn)转变;热分析和组织观察证明合金相的稳定性趋势为X相>W相>I相>Mg7Zn3相;Mn元素主要以单质颗粒形式弥散分布在基体中;Y的添加能显著提升Mg-Zn-Mn合金的力学性能,其中含6.09%Y的挤压态合金具有最佳的力学性能,其抗拉强度和屈服强度分别达到389 MPa和345 MPa。合金强度的提升主要源于Y元素的晶粒细化、Mn颗粒的弥散强化和Mg-Zn-Y稀土相的引入。

关 键 词：Mg-Zn-Mn alloy Y MICROSTRUCTURE mechanical property FRACTURE 

分 类 号：TG146.22[一般工业技术—材料科学与工程]