Ca变质及热挤压对AZ31镁合金组织的影响
Effects of Modification by Ca and Hot Extrusion on Microstructure of AZ31 Magnesium Alloy
林继兴
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作者单位：浙江工贸职业技术学院 先进材料研发中心，浙江 温州 325003
中文关键字：Ca；热挤压；AZ31；晶粒细化
英文关键字：Ca； hot extrusion； AZ31； grain refinement
中文摘要：研究了金属Ca变质处理及热挤压变形对镁合金组织、晶粒大小的影响。结果表明：0.4%的Ca能使AZ31镁合金的β-Mg17Al12组织明显球化，均匀化处理后晶粒尺寸由变质前的546 μm降至147 μm；另外，400 ℃下热挤压也能强烈地细化组织，平均晶粒尺寸降至20 μm以下，其机理是发生了动态再结晶与孪生变形。
英文摘要：The effects of modification by Ca and hot extrusion on microstructure and grain size of AZ31 magnesium alloy were investigated. The results show that the shape of β-Mg17Al12 spheroidize is obvious with the addition of 0.4%Ca in the alloy, and the grain size reduces from 546 μm to 147 μm after homogenization treatment. Meanwhile, because of the dynamic recrystallization and twinning deformation, the microstructure of AZ31 magnesium alloy would be refined by hot extrusion under 400 ℃, and the average grain size decreases to below 20 μm.