(1. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院，上海 200030;
2. 中國科學(xué)院 上海硅酸鹽研究所 高性能陶瓷和
超微結(jié)構(gòu)國家重點(diǎn)實(shí)驗(yàn)室，上海 200050)
摘 要: 運(yùn)用熔體溫度處理工藝，研究了A356鋁合金中Cu，F(xiàn)e，Mg成分的變化對凝固組織及性能的影響。組織觀察和性能測試結(jié)果表明， 熔體溫度處理工藝能夠明顯抑制富Cu、富Mg、富Fe等金屬間化合物相的析出，改善和減小了富Cu、富Mg、富Fe相析出形貌和尺寸，顯著地提高合金力學(xué)性能。用團(tuán)簇理論分析和解釋了有關(guān)的實(shí)驗(yàn)現(xiàn)象和結(jié)果。
關(guān)鍵字: A356鋁合金；熔體溫度處理；合金成分；凝固組織；原子團(tuán)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
