本文借助扫描电镜、电子探针等分析手段,详细地考察了Sr,Sb对纯度不同、成分不同的Al-Si合金在不同冷速下的变质作用,作出了五种Al-Si合金的含Sr(或Sb)量-冷却速度-显微组织的诺谟图,可供生产现场选择最佳加Sr、加Sb量作依据。实验结果表明,Al-Si合金加Sr后变质存在一个变质阈值,超过这个阈值时,即便在投缓慢的冷速(4.5℃/min)下,仍能获得完全变质的组织。这个变质阈值随着冷速的减慢而增大。Sr,Sb均能消除硅晶体的非自发形核基底,阻止初晶硅析出,但对共晶硅生长形态的影响不同。
The modification of five Al-Si alloys of different purity and composition with 9—14 wt-% Si at various cooling rates influenced by an additive Sr or Sb has been investigated in detail by means of SEM, EPMA, etc. The microstructural nomograph of these Al-Si alloys is constructed to provide for the selection of optimum addition of Sr or Sb in production practice Experimental results indicate a threshold of Sr content in Al-Si alloy modification, over it, the structure of Al-Si alloy may be completely modified even at quite slow cooling rate down to 4.5℃/min. The threshold increases with the decrease of cooling rate Both Sr and Sb can retard the initiation of Si precipitation, but differ in the influence on the growth form of eutectic Si
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