AZ91D镁合金的冷却凝固特性研究
Research on Characteristics of Cooling and Solidification of AZ91D Mg-alloy
张泽磊， 杨 刚， 杨 屹， 卢 东
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作者单位：四川大学 制造科学与工程学院，四川 成都610065
中文关键字：AZ91D镁合金；差示扫描量热法；冷却凝固特性
英文关键字：AZ91D magnesium alloy; differential scanning calorimetry (DSC); characteristics of cooling and solidification
中文摘要：采用DSC对AZ91D镁合金的冷却凝固特性进行了研究。研究发现，AZ91D镁合金的液相线温度为595 ℃，固相线温度为470 ℃，液、固相线温度差为125 ℃，属于宽结晶温度范围低熔点合金。该合金的平均自由线收缩率为1.572%，冷却凝固时倾向于体积凝固方式，容易形成粗大的离异共晶组织。
英文摘要：The characteristics of cooling and solidification of AZ91D magnesium alloy were studied by using DSC. The results indicate that AZ91D magnesium alloy liquidus temperature is about 595℃ and solidus temperature is about 470℃, so the difference between solid and liquid temperature is 125℃, which implies that AZ91D magnesium alloy belongs to a type of wide crystallization temperature range and low-melting-point alloy. The average free line contraction rate of AZ91D magnesium alloy is 1.572%, its solidification mode is inclined to be paste-solidification, which is prone to form coarse divorced eutectic structure in the casting.