(1. 上海交通大学 材料科学与工程学院，上海 200030;
2. 中国科学院 上海硅酸盐研究所 高性能陶瓷和
超微结构国家重点实验室，上海 200050)
摘 要: 运用熔体温度处理工艺，研究了A356铝合金中Cu，Fe，Mg成分的变化对凝固组织及性能的影响。组织观察和性能测试结果表明， 熔体温度处理工艺能够明显抑制富Cu、富Mg、富Fe等金属间化合物相的析出，改善和减小了富Cu、富Mg、富Fe相析出形貌和尺寸，显著地提高合金力学性能。用团簇理论分析和解释了有关的实验现象和结果。
关键字: A356铝合金；熔体温度处理；合金成分；凝固组织；原子团簇
processed by melt temperature treatment
（1. School of Materials Science and Engineering, Shanghai Jiaotong University,
Shanghai 200030, China;
2. State Key Laboratory of High Performance Ceramics and Superfine
Microstructure, Shanghai Institute of Ceramics, The Chinese
Academy of Science, Shanghai 200050, China）
Abstract:The effect of composition of Cu, Fe, Mg on the solidification structure and mechanical properties of the hypoeutectic A356 alloy treated by melt temperature treatment (MTT) process was studied. The results of solidification structure observation and mechanical properties e valuation show that the MTT process can obviously restrain the precipitation, change the morphology of intermetallic compound by the size decreasing, such as Cu-rich, Fe-rich and Mg-rich phase. So the mechanical properties are improved. Finally, the experimental results were analyzed according to the theory of atom clusters.
Key words: A356 alloy；melt temperature treatment；alloy composition；solidification structure；atom clusters
