采用二次挤压工艺制备MB26(Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd)镁合金棒材,研究不同挤压比对MB26合金组织性能的影响,通过金相(OM)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等手段分析稀土元素在合金中的分布及其对微观组织的影响.结果表明:合金在二次挤压过程中发生动态再结晶,随着挤压比的增加,再结晶晶粒细化,当挤压比λ=25时,平均晶粒尺寸为1.9 μm,合金力学性能达到最优；合金经挤压变形后出现大量W(Mg3Y2Zn3)相和β'(MgZn)相,均呈弥散分布,钉扎晶界,阻碍了动态再结晶晶粒的长大.通过数据拟合得到该合金屈服强度与晶粒尺寸的Hall-Petch关系.
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