周正,朱伟

• 1:重庆大学材料科学与工程学院

摘要(Abstract)：

用示差扫描量热分析了Al-Si合金温度处理的熔体结构变化规律及结构变化温度。结果表明,在升温阶段的Al-7%Si亚共晶、Al-12%Si共晶及Al-20%Si过共晶合金的熔体中均存在额外的热效应,范围均在798～850℃之间,额外热效应温度范围与含硅量无关,结构转变焓值随合金的硅含量增加而增加,氢含量不影响结构转变的温度;而在降温过程中仅在Al-20%Si过共晶合金中发现了额外热效应,额外热效应的出现及温度范围取决于降温速度。分析认为,升温阶段的额外热效应体现了Al的熔体结构变化,降温阶段的额外热效应与熔体中的Si-Si原子团簇的行为有关。

关键词(KeyWords)： 铝合金;结构;加热;冷却;转变

Abstract:

Keywords:

基金项目(Foundation): 重庆市自然科学基金(CSTC,2006BB4239)

作者(Author): 周正,朱伟

DOI: 10.13289/j.issn.1009-6264.2010.04.007

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