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3.2 Al-Si二元系合金的组织与性能 3.2.1 Al-Si合金的特征实用合金中的纯二元Al-Si合金有铸件用合金的AC3A和压铸件合金的ADCl。二者大致都是共晶成分的,强度大于或稍低于100兆帕,但因流动性好被用来制作各种机械的壳体、进气管接头等薄壁机器零件和楼房外壁用的大型面板、住宅用的外装品等建筑材料。 Al-Si二元系合金,在共晶成分时为α(Al)固溶体和近似针状的细薄片状Si的共晶组织,Si的排列是无规则的。在亚共晶成分的场合,是由树枝状晶的α(Al)固溶
3.2 Microstructure and properties of Al-Si binary alloys 3.2.1 Characteristics of Al-Si alloys Pure binary Al-Si alloys for practical alloys include AC3A for castings and ADCl for die-cast alloys. Both are generally eutectic composition, strength greater than or slightly less than 100 MPa, but because of good fluidity is used to make all kinds of mechanical shell, inlet pipe joints and other thin-walled machine parts and building exterior wall with large Panels, residential exterior products such as building materials. Al-Si binary system alloy, eutectic composition of the α (Al) solid solution and the approximate needle-like thin flaky Si eutectic structure, Si arrangement is random. In the case of hypoeutectic components, α (Al) is dissolved in dendrites