亚共晶铝硅合金晶粒度热分析法评估判据

Evaluation Criterions of Grain Refinement for Hypoeutectic Al-Si Alloy by Thermal Analysis

从液态合金凝固的热力学、动力学及传热学角度，对铸造合金的晶粒细化过程作了分析，综合现有的铝硅合金晶粒细化度热分析法评估判据，针对晶体的形核和长大过程，提出了“过冷面积和团相生长加速度”的晶粒细化度的评估判据。

Based on thermal dynamics, billetics and heat--transfer of solidification of the liquid metal, the grain refining treatments has been analyzed in the field of casting alloys. The existing evaluation criterions for grain refinement of Al--Si alloys by thermal analysis were reviewed. According to nucleation and growth of crystals, the new evaluation criterions of 'undercooling area and growth acceleration of solid phase' were suggested.