求翻译：铝硅合金具有比重小、强度高、良好的成形性能、高温流动性能和加工性能等一系列优点，广泛应用于工程机械、车辆、机电等领域中的各种铸锻件。而其中亚共晶铸造A1-Si合金由于具有较好的流动性能及经过改性后优良的力学性能，从而成为制造行业中相当受重视的结构材料之一。通过控制铸件冷却速度可以改善合金的组织和性能，铸件凝固冷却速度与铸件的结构、浇注温度和铸型材料铸造工艺方法等有关。本文通过改变铸型材料，得到不同凝固冷却速度，在此条件下，研究亚共晶铝硅合金凝固组织形态。结果表明：是什么意思？

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aluminum silicon alloy with a small proportion, high strength, good performance, high temperature for the forming and processing performance mobility can be a series of advantages, widely used in construction machinery, vehicles, electrical and mechanical services in the areas of cast alloy applicat

The aluminum silicon alloy has the proportion small, the intensity high, the good formed performance, the high temperature flow properties and workability and so on a series of merits, widely applies in the project machinery, the vehicles, mechanical and electrical and so on in domain each kinds cas

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