将AZ91D镁合金铸锭在330℃往复挤压4道次后,在300℃连续正挤压制成φ5 mm的丝材,用OM,SEM分析不同方式挤压前后组织的变化,研究往复挤压及随后正挤压对其组织与性能的影响.研究表明,AZ91D镁合金往复挤压4道次及连续正挤压制备的φ5 mm丝材组织均为等轴晶,晶粒尺寸分别为小于10μm及1 μm～3 μm.经往复挤压及随后的正挤压,AZ91D铸造镁合金的综合力学性能均可得到显著提高,其主要原因是基体组织α-Mg和强化相β-Mg17Al12的细化.往复挤压4道次后,材料真应变高达20.36,正挤压过程中等效应变速率达到0.192 s-1,AZ91D镁合金往复挤压及正挤压晶粒的细化机制主要包括破碎、动态再结晶和动态回复.
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