[請益] 組成過冷
在論文中看到這個字,不過以前修相變態時從來沒搞懂過
固化過程中,因為溶質原子在固相中溶解度較低
所以溶質原子會被排到液相中,而隨著距固液介面距離越遠溶質原子濃度越低
對照平衡相圖,發現濃度越高的部份達平衡的溫度越低
所以溫度是隨距離固液相介面越遠而越高.
但假如真實溫度梯度並不是這樣分佈,而且低於"平衡溫度梯度"
就會有組成過冷的現象.
所以組成過冷會造成什麼現象嗎??光看以上的解釋還是想不通...
謝謝!!
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