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采用各种分析手段研究Y和Ce元素在镁中的存在形式和热力学行为,以及稀土元素对镁合金组织的影响。结果表明,镁合金的晶界处先形成Mg12Ce相,继而生成Mg24Y5相。镁合金经过固溶和时效处理后,在晶界和晶粒内分别析出Mg12Ce和Mg24Y5相;随时效时间延长,晶粒内逐渐出现更稳定的呈点状分布的相,它由Mg24Y5、Mg2Y及Mg Y 3种化合物组成,晶界上也出现了由多种镁铈金属间化合物组成的相,镁合金硬度随时效时间先升高后降低再升高。
The existence and thermodynamic behavior of Y and Ce elements in magnesium were studied by various analytical methods and the effect of rare earth elements on the microstructure of magnesium alloy was investigated. The results show that the Mg12Ce phase is firstly formed at the grain boundaries of the magnesium alloy, and then the Mg24Y5 phase is formed. After solution treatment and aging treatment, Mg12Ce and Mg24Y5 phases were precipitated in the grain boundaries and grains, respectively. With the aging time prolonged, a more stable phase appeared in the grain, which was composed of Mg24Y5, Mg2Y and Mg Y three kinds of compounds, the grain boundary also appeared by a variety of magnesium cerium intermetallic compounds phase, magnesium alloy hardness with the aging time first increased then decreased and then increased.