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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effects of combined additions of Sr and AlTiB grain refiners in hypoeutectic Al-Si foundry alloys
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Effects of combined additions of Sr and AlTiB grain refiners in hypoeutectic Al-Si foundry alloys

机译：Sr和AlTiB晶粒细化剂组合添加对亚共晶Al-Si铸造合金的影响

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摘要

Strontium is the most widely used and a very effective element for modifying the morphology of eutectic silicon, while Ti and B are commonly present in the commercial grain refiners used for Al-Si alloys. Systematic studies on the effects of combined additions of Sr and different AlTiB grain refiners on the Al + Si eutectic and primary aluminium solidification have been performed. While slight coarsening of both eutectic Si and primary aluminium grains occurs during holding, no obvious interactions are observed between Sr and AlTiB grain refiners when the addition level of grain refiners is low. As a result, a well-modified and grain refined structure was obtained. However, strong negative interactions between Sr and Al1.5Ti1.5B were observed as the addition level of the grain refiner increases. It was found that these interactions have a much more profound impact on the eutectic solidification than the primary Al solidification. The melt treated with combined additions of Sr and Al1.5Ti1.5B still shows good grain refinement efficiency even after losing its modification completely. The mechanism responsible for such negative interactions is further discussed.
机译：锶是最广泛使用的并且是改变共晶硅形态的非常有效的元素，而Ti和B通常存在于用于Al-Si合金的商业晶粒细化剂中。系统地研究了Sr和不同的AlTiB晶粒细化剂组合添加对Al + Si共晶和初生铝凝固的影响。在固持过程中，虽然共晶Si和原始铝晶粒均略微粗化，但当晶粒细化剂的添加量较低时，Sr和AlTiB晶粒细化剂之间未观察到明显的相互作用。结果，获得了良好改性的和晶粒细化的结构。然而，随着晶粒细化剂添加量的增加，观察到Sr和Al1.5Ti1.5B之间存在强烈的负相互作用。已发现，这些相互作用对共晶凝固的影响比一次Al凝固的影响大得多。即使完全失去其改性，用Sr和Al1.5Ti1.5B的组合添加处理的熔体仍显示出良好的晶粒细化效率。进一步讨论了造成这种负面互动的机制。

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