采用近液相线铸造的方法浇铸了镁合金AZ91D,并与液相铸造的组织进行了对比.通过不同铸模浇铸考察了冷却速率对组织的影响,研究了近液相线铸造时的静置时间对铸造组织的影响实验结果表明,液相(600℃)铸造组织与常规铸造组织接近.高冷却速率促进了枝晶化:近液相线铸造方法有利于组织的细化和球化,但不如铝合金显著:增加冷却速率有利于组织的细化.也促进了球化的趋势.并对近液相线组织的演变机理进行了初步探讨.
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