(中南工業(yè)大學(xué)非平衡材料研究所，長沙 410083)
摘 要: 運用Pringogine的非平衡熱力學(xué)理論，分析了金屬及合金在非平衡凝固條件下凝固的熱力學(xué)行為， 提出了非平衡凝固時， 獲得亞穩(wěn)組織的臨界過冷度方程。 運用此模型計算了合金的玻璃轉(zhuǎn)變點， 并分析了各物性參量對玻璃轉(zhuǎn)變點的影響，結(jié)果與實驗有較好的吻合。 由此可以看出， 用非平衡熱力學(xué)理論描述金屬及合金的非平衡凝固是可行的。
關(guān)鍵字: 非平衡凝固 非晶轉(zhuǎn)變； 非平衡熱力學(xué)
（Research Institute for Non-equilibrium Material Science and Engineering Central South University of Technology, Changsha, Hunan 410083, P. R. China）
Abstract:The thermodynamic behavior of nonequilibrium solidification of metals and alloys has been analysed, and an equation met by the critical reduced supercooling at which the solidification system may become unstable and the solidification product will be not the equilibrium structure but the metastable structure was proposed. Based on this model, the glass transition temperatures of some metals and alloys have been calculated and the influences of material parameters on glass transition temperature have been discussed. The results are in good agreement with the experiments. It has been shown feasible to describe the nonequilibrium solidification by using Pringogine's nonequilibrium thermodynamic theory.
Key words: nonequilibrium solidification glass transition nonequilibrium thermodynamics
