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Д1合金的变化特性和最终性能,不仅决定于化学成分,而且还决定于铸造和热变形的工艺。当合金的化学成分固定不变时,只有改变结晶条件,才能对所铸造的合金的结晶机理、相成分、宏观和显微组织产生影响。图1是在各种条件下结晶的铸造均匀化后的Д1合金的典型显微组织。在磁场中结晶的合金,具有非常明显的网格状显微组织。而在通常条件下结晶的合金,具有树枝状显微组织。当主要合金元素的含量(4.2％Cu,0.45％Mg,0.62％Mn)不变时,铁和硅的总含量从0.35％
The changing properties and final properties of the Д1 alloy depend not only on the chemical composition but also on the casting and thermal deformation processes. When the chemical composition of the alloy is constant, only by changing the crystallization conditions, in order to cast the alloy crystallization mechanism, phase composition, macroscopic and microstructure effects. Figure 1 is a typical microstructure of the Д1 alloy after homogenization of the castings crystallized under various conditions. Crystals in the magnetic field of the alloy, with a very obvious grid-like microstructure. However, the alloy crystallized under the usual conditions has dendritic microstructure. When the content of the main alloying elements (4.2% Cu, 0.45% Mg, 0.62% Mn) is constant, the total content of iron and silicon increases from 0.35%