基于耗散结构理论的金属凝固过程探讨
Hot Working Technology(2013)
Abstract
将耗散结构理论应用到金属凝固研究中,论述了金属凝固形成的各种形态晶体就是各个稳定的耗散结构分支,外界输入条件达到的阈值就是成分过冷判据,触发金属凝固形成耗散结构分支的涨落包括体积涨落(由溶质传输决定)和温度涨落(由热量传输决定)。分析表明,固液界面所受体积涨落(溶质传输)影响比温度涨落(热量传输)影响越大,固液界面越不稳定,越容易从平面晶趋向于胞晶和枝晶凝固。固液界面所受体积涨落(溶质传输)影响比温度涨落(热量传输)影响越小,固液界面越稳定,越容易趋向于平面晶凝固。
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Key words
volume fluctuation,temperature fluctuation,dissipative structure,metal solidification,threshold
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