Comparison of newtonian and fourier thermal analysis techniques for calculation of latent heat and solid fraction of aluminum alloys
Comparison of newtonian and fourier thermal analysis techniques for calculation of latent heat and solid fraction of aluminum alloys
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DOI：
10.30544/379
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发表时间：
2004-06
影响因子：
0.9
通讯作者：
D. Emadi;L. V. Whiting;M. Djurdjevic;W. T. Kierkus;J. Sokolowski
中科院分区：
文献类型：
--
作者：
D. Emadi;L. V. Whiting;M. Djurdjevic;W. T. Kierkus;J. Sokolowski
冷却曲线分析（CCA）已在金属铸造行业中广泛使用，通常用于预测合金合成和微观结构成分。如果可以正确计算零曲线，则可以将CCA的使用扩展到其他固化区域。在本文中，描述了确定零曲线的牛顿和傅立叶技术。开发了这些技术来计算潜热并确定Al-7 wt％Si合金的固体分数与温度/时间之间的相关性。检查了潜在热量计算过程中固体和液相的热容量和密度变化的重要性。将通过计算机辅助冷却曲线分析（CA-CCA）方法计算的潜热与文献中报道的方法进行了比较。研究了两种技术的实验程序和采样杯类型对潜热计算的影响。
The cooling curve analysis (CCA) has been used extensively in the metal casting industry, usually to predict alloy compositio n and microstructure constituents. The use of CCA can be expanded to other areas of solidification if the zero curves can be properly calculated. In this paper the Newtonian and Fourier techniques of zero curve determination are described. These techniques were developed to calculate latent heat and to determine the correlations between solid fraction and temperature/time for Al-7 wt%Si alloy. The importance of the changes in heat capacity and density of solid and liquid phases during solidification on the latent heat calculations was examined. The latent heat calculated by Computer-Aided Cooling Curve Analysis (CA-CCA) method is compared with those reported in the literature. The effect of experimental procedure and type of sampling cup on the latent heat calculations were studied for both techniques.