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中文摘要：
研究不同稀土Y含量对Mg-6Zn-lMn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345MPa.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.
英文摘要：
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.
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