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Microstructural Evolution of AZ91D-1.5Er during Semi-solid Isothermal Treatment

机译:半固态等温处理期间AZ91D-1.5%Er的组织演变

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摘要

In this paper, chip recycling technology combined with SIMA method which is called CR-SIMA method was adopted to prepare semi-solid billets. AZ91D magnesium alloy was refined by Er and its microstructural evolution was investigated during semi-solid isothermal treatment. The results show that Er can improve the feature of cast structure and decrease the grain size. Moreover, the γ-Mg_(17)Al_(12) phase is well refined and disperses in the α-Mg matrix. A semisolid microstructure with small and spheroidal primary particles can be obtained after partially remelting. With increasing heating temperature, the dissolution of eutectic Mg_(17)Al_(12) phase first took place, resulting in the primary dendritic grains coarsening into interconnected non-dendritic grains. With heating continuously, the residual interdendritic γ-Mg_(17)Al_(12) at the edges of the primary grains melted in succession and the primary grains separated into small polygon grains. During the semi-solid isothermal treatment, the amount of liquid increased until the solid-liquid system reached its equilibrium state. At the same time, owing to the decreasing of interfacial energy, the grains gradually spheroidized and began to grow with a further increasing of the holding time.
机译:本文采用芯片回收技术结合SIMA方法(称为CR-SIMA方法)制备半固态坯料。用Er精炼AZ91D镁合金,并研究了其在半固态等温热处理过程中的组织演变。结果表明,Er可以改善铸件组织特征,减小晶粒尺寸。此外,γ-Mg_(17)Al_(12)相被很好地细化并分散在α-Mg基质中。部分重熔后可获得具有小且呈球形的初级颗粒的半固态组织。随着加热温度的升高,共晶的Mg_(17)Al_(12)相首先发生溶解,导致初级枝晶晶粒粗化为相互连接的非枝晶晶粒。通过连续加热,一次晶粒的边缘处的残余枝晶间γ-Mg_(17)Al_(12)连续熔化,并且一次晶粒分离成小的多边形晶粒。在半固体等温处理过程中,液体的数量增加,直到固液系统达到平衡状态为止。同时,由于界面能的降低,随着保持时间的进一步增加,晶粒逐渐球形化并开始生长。

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