利用扫描电镜和能谱仪对挤压态Mg-13Gd-4Y-0.4Zr合金在300℃/2～32 h的时效析出相进行研究.结果表明,经300℃/2-4 h时效后合金中有大量白色块状相析出,它是由大量的合金元素组成;经300℃/8～32 h时效后,合金中析出两种相,一种是白色块状相,另一种是在晶内析出的片状相,它含有的溶质元素略高于基体.晶内析出的片状相沿3个方向排列析出,3个方向之间互成120℃夹角,呈现出严格的位向关系.析出物的形态和分布取决于溶质元素的浓度.在溶质元素浓度高的区域先析出含有大量溶质元素白色块状相;随后析出的片状相的疏密程度也取决于溶质元素的浓度.
The precipitated phases of Mg-13 Gd-4Y-0.4Zr alloy under the aging condition of 300 ℃ for 2 ～ 32 h were investiga-ted by SEM and EDS. The results demonstrated that when the aging time was within 2 ～ 4 h at 300 ℃, a lot of white brick shaped precipitates rich in ahoy elements were founded in the alloy. While increasing the aging time within 8 ～ 32 h there were two phases precipitated in the alloy, one was white brick shaped phase, the other was lamellar phase precipitated within grains. The solute elements in the lamellar precipitate were slightly higher than that in the matrix. And the arrangement of the lamellar precipitates extended in three directions with mutual fixed angle of 120 ℃, showing strict crystallography relationship. The mor-phology and distribution of the precipitates depended on the concentration of solute elements. In the high concentration solute ele-ments area, the precipitated phase was white block, there after the lamellar phase would precipitate and its density also depended on the concentration solute elements.
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