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首页> 外文期刊>Journal of Materials Engineering and Performance >Structural and Mechanical Properties of Directionally Solidified Al-Si Alloys
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Structural and Mechanical Properties of Directionally Solidified Al-Si Alloys

机译：定向固化的Al-Si合金的结构和力学性能

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摘要

This review covers research aimed at finding the optimum composition and growth rate to obtain a highly modified Al-Si alloy using directional solidification. Investigations of microstructure and mechanical properties as a function of Si content and growth rate are analyzed. These works show that the composition yielding a eutectic microstructure changes considerably with increasing solidification rate in the range of 10(2)-10(4) mu m/s. The increase in ultimate tensile strength with increasing Si content up to that giving a completely eutectic microstructure is explained by a redistribution of volume content of alpha-Al and eutectic. The increase in tensile strength with increasing rate is explained by a decrease in microstructural scale accompanying the transformation of flake-to-fiber eutectic microstructure. The optimal fine fiber structure without any primary crystals of Al-Si alloy at a given Si content is obtained at the solidification rate giving a completely eutectic microstructure at that composition. Hypereutectic alloys can be fully modified using rapid cooling at such solidification rate that causes coupled growth of the eutectic for given composition of the alloy. Additional Sr modification results in a super-modified structure, high tensile strength and record high elongation.
机译：本综述涵盖旨在找到最佳组合物和生长速率的研究，以获得使用定向凝固的高度改性的Al-Si合金。分析了微观结构和机械性能作为Si含量和生长速率的函数的研究。这些作品表明，在10（2）-10（4）mu m / s的范围内，该组合物产生共晶微观结构的变化显着变化。通过将α-Al和共晶的体积含量的重新分布来解释，通过增加Si含量增加均匀的抗拉强度的增加与提供完全共晶微观结构的。通过伴随薄片 - 光纤共晶微观结构的转化的微观结构刻度的降低，解释了抗拉强度的增加。在给定的Si含量下没有Al-Si合金的任何初级晶体的最佳细纤维结构在该组合物的完全共晶微观结构上获得。通过在这种凝固率的快速冷却的情况下，可以通过快速冷却来完全修饰过度化合金，其导致给予合金组合物的共晶的偶联生长。额外的SR改性导致超改性结构，高抗拉强度和记录高伸长率。

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