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采用熔铸法制备了Mg-4Y-3R_E-0.5Zr合金,利用固溶处理和时效处理;采用扫描电子显微镜(SEM)观察了合金的微观组织,利用能谱仪(EDS)对微区成分和析出相进行了分析,采用X射线衍射仪对合金的相组成进行分析。结果表明,Mg-4Y-3R_E-0.5Zr铸态合金由α-Mg和晶界处Mg-Y-Nd三元相组成,析出相为不规则的条状,固溶处理后晶界处三元相溶入基体,晶粒尺寸与铸态晶粒尺寸相差不明显。随着时效时间增加,晶粒尺寸无明显变化,时效2 h后,晶粒内部出现细针状和细小颗粒的析出相,且随时效时间延长析出相的数量明显增加。固溶+时效处理8 h后的合金比铸态合金的拉伸性能提高了30 MPa,而伸长率没有明显变化。
The alloy Mg-4Y-3R_E-0.5Zr was prepared by melt casting method. The microstructure of the alloy was observed by scanning electron microscopy (SEM) Phase was analyzed, the phase composition of the alloy was analyzed by X-ray diffractometer. The results show that the as-cast Mg-4Y-3R_E-0.5Zr alloy consists of α-Mg and Mg-Y-Nd ternary phases at the grain boundaries with irregular precipitates. After solution treatment, the ternary Compatibility into the matrix, the grain size and the as-cast grain size difference is not obvious. With the increase of aging time, the grain size did not change obviously. After 2 h of aging, the precipitation of fine needles and fine particles appeared in the grains, and the number of precipitates increased obviously with the aging time. Tensile properties of the alloys after solution treatment and aging treatment for 8 h were as high as 30 MPa compared with as-cast alloys, while the elongation did not change significantly.