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三、铝合金快速冷凝及其特性在金属铸造过程中凝固速度随铸入温度、铸模性状和铸件大小而显著不同。近来,在先进的薄件铸造及压力铸造中,冷却速度也有时达到几十度/秒。用亨特铸造法连续铸造时,冷却速度达到几百度/秒。凝固时的冷却速度逐渐增大时出现非平衡组织,晶枝间距变小,结晶组织细化,含有的元素向铝中固溶的限度扩
Third, the rapid condensation of aluminum and its characteristics In the metal casting process, the solidification speed with the casting temperature, casting properties and casting size and significantly different. Recently, in advanced thin castings and pressure casting, the cooling rate sometimes reaches tens of degrees / second. With Hunter casting continuous casting, the cooling rate of several hundred degrees / sec. When the cooling rate of solidification gradually increases, the unbalanced structure appears, and the distance between crystal branches becomes smaller, the crystal structure is refined, and the limit of solution containing elements to aluminum is expanded