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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >RECENT PROGRESS IN UNDERSTANDING EUTECTIC SOLIDIFICATION IN ALUMINUM-SILICON FOUNDRY ALLOYS
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RECENT PROGRESS IN UNDERSTANDING EUTECTIC SOLIDIFICATION IN ALUMINUM-SILICON FOUNDRY ALLOYS

机译：铝硅基体合金中共晶凝固的最新进展

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摘要

It is now well established that three different eutectic solidification mechanisms may occur in Al-Si foundry alloys. The operation of each mechanism can be controlled by altering the chemical composition and casting conditions. Recent research has focussed on the understanding of the mechanisms determining the eutectic solidification mode by investigating the growth mechanisms in ultra-high purity and commercial purity alloys, the effect of a wide range of different potential modifying elements and investigating the eutectic nucleation mode. It is concluded that nucleation of eutectic grains is prolific in unmodified commercial purity alloys. In contrast, high-purity alloys have relatively few nuclei and only a few eutectic grains nucleate. Nuclei can also be removed, or rendered inactive, by the addition of modifying elements to commercial purity alloys. There is a relationship between the number of eutectic grains and the morphology of the eutectic because the growth rate of the eutectic depends on the surface area. The three eutectic solidification modes have widely differing spatial distributions of growing eutectic and therefore significant effects on the feeding efficiency of the alloys. Porosity is significantly affected by eutectic solidification mode and there is a direct relationship between them.
机译：现已确定，Al-Si铸造合金中可能发生三种不同的共晶凝固机制。每个机构的操作都可以通过改变化学成分和铸造条件来控制。最近的研究集中在通过研究超高纯度和商业纯度合金中的生长机理，各种不同的潜在修饰元素的影响以及研究共晶成核模式，来确定决定共晶凝固模式的机理。结论是，在未改性的商业纯度合金中，共晶晶粒的成核作用很大。相反，高纯度合金具有相对较少的核，并且仅具有少量的共晶晶粒。通过向商业纯度合金中添加改性元素，也可以去除核或使其失去活性。共晶晶粒的数量与共晶的形态之间存在关系，这是因为共晶的生长速率取决于表面积。三种共晶凝固模式具有不同的生长共晶空间分布，因此对合金的进料效率有显着影响。孔隙率受共晶凝固模式的显着影响，并且两者之间存在直接关系。

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