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Semi-solid forming of magnesium alloys with high Al and Zn contents

机译：高铝和锌含量的镁合金的半固态成形

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摘要

In this study, the suitable alloys for semi-solid forming are searched considering the advantage of carrying out fabrication of near-net shaped products at a lower temperature than die-casting. Firstly Mg-20 percent Al alloy as selected as a model alloy for preliminary evaluation of fluidity. Furthermore, in order to improve mechanical properties, Mg-20 percent Al alloy was chosen as a base alloy, and alloys containing Zn and Ca with reduced Al content were also investigated. These investigated alloys show that solid fraction becomes about 57 to 65 percent just above the melting temperatures of eutectic regions, and solid particles become spherical due to the introduced compressive strain. Besides, eutectic regions, which are rapidly cooled from the semi-solid temperatures during press forming exhibit fine microstructure. The fluidity of Mg-20 percent Al alloy and alloys containing Zn is excellent, while the alloys containing Ca are extremely bad. It is possible to harden all of the investigated alloys by aging. However, heat-treated high Al containing alloys show low tensile strength and elongation because a network of the eutectic compound, Mg_17Al_12 is retained along the grain boundaries even after solution heat treatment, and this becomes the source of crack initiation and propagation. On the other hand, in the alloys having reduced Al content and containing Zn or Ca, the tensile properties increase due to the changes of the morphologies or kinds of eutectic compounds.
机译：在这项研究中，考虑到可以在比压铸更低的温度下制造近净成形产品的优势，寻找适合半固态成型的合金。首先，选择Mg-20％的铝合金作为模型合金，以初步评估流动性。此外，为了改善机械性能，选择Mg-20％的Al合金作为基础合金，并且还研究了Al含量降低的含Zn和Ca的合金。这些研究过的合金表明，刚好在共晶区域的熔化温度之上，固体成分变为约57％至65％，并且由于引入的压缩应变，固体颗粒变为球形。此外，在冲压成型过程中从半固态温度迅速冷却的共晶区域表现出良好的微观结构。 Mg-20％的铝合金和含Zn的合金的流动性极好，而含Ca的合金的流动性极差。有可能通过时效硬化所有被研究的合金。然而，由于即使在固溶热处理后，共晶化合物Mg_17Al_12的网络仍沿晶界保留，因此经热处理的高含Al合金显示出较低的拉伸强度和伸长率，这成为裂纹萌生和扩展的来源。另一方面，在具有减少的Al含量并且包含Zn或Ca的合金中，由于共晶化合物的形态或种类的变化，拉伸性能增加。

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