(贵州工业大学冶金系， 贵阳 550003)
摘 要: 由Al-Si-Fe三元系的三个二元子系用Bonnier法计算和讨论了Al-Si-Fe合金在不同温度下各组元的活度。结果表明，该三元系中各组元活度均有负偏差，尤以Fe的偏差为大。当Al含量较高时，合金中Al的活性可近似于纯金属Al的活性。三元系中Al含量不变时，增加Fe的含量，即用Fe代替部分Si可使Al的活度有所增加。对于Al-Si-Fe三元系的计算，Bonnier法比其它解析计算方法简单。
关键字: Al-Si-Fe三元系；活度；计算
（Department of Metallurgy, Guizhou University of Technology, Guiyang 550003, P.R.China）
Abstract:From the three relative binary systems of Al-Si-Fe ternary system, the activity of each component in the Al-Si-Fe ternary system at various temperatures was calculated and discussed. The activities of all components in the ternary system have negative deviations, especially very high for Fe. When the content of Al is higher, the activity of Al in the alloy is nearly equal to the activity of pure Al. In the Al-Si-Fe ternary system,when the content of Al is constant, if the content of Fe increases,the activity of Al will increase. For the calculation of Al-Si-Fe ternary system, the method is simpler than another analysis method.
Key words: Al-Si-Fe ternary system; activity; calculation
