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利用层错能的热力学模型对AZ31,AZ61,AZ91等六方系合金的层错能进行了计算,推导出溶质元素含量及偏聚对层错能影响的理论表达式。计算结果表明:该热力学模型适用于六方系合金层错能的计算,计算的结果与实验相符。其中AZ31,AZ61,AZ91合金的基面层错能在373K时都为45mJ/m2。镁合金层错能随着温度的升高逐渐降低,化学自由能对层错能的影响占主导地位。Al元素有降低镁合金层错能的作用,随着固溶于镁基体中Al含量的增加,合金的层错能降低。合金元素在层错区域内的偏聚对层错能造成的影响也不容忽视,溶质元素Al的偏聚增加了镁合金的层错能。
The stacking fault energy of the hexagonal alloys such as AZ31, AZ61 and AZ91 was calculated by using the thermodynamic model of the stacking fault energy, and the theoretical expression of the effect of solute content and segregation on the stacking fault energy was deduced. The calculation results show that the thermodynamic model is suitable for calculating the stacking fault energy of the hexagonal alloy, and the calculation results are in good agreement with the experiment. The AZ31, AZ61, AZ91 alloy base layer stacking fault energy at 373K when both 45mJ / m2. The stacking fault energy of magnesium alloy gradually decreases with increasing temperature, and the influence of chemical free energy on the stacking fault energy dominates. The Al element has the effect of reducing the stacking fault energy of the magnesium alloy, and the stacking fault energy of the alloy decreases as the content of Al in the matrix dissolves in the magnesium increases. The effect of the segregation of alloying elements in the stratified faults on the faults can not be ignored. The segregation of solute elements Al increases the stacking fault energy of the magnesium alloy.