【摘要】 对Al-Fe-Mg-Si和Al-Fe-Mn-Si2个四元系进行热力学优化评估,并对这2个四元系富Al角的零变量平衡反应温度和液相成分进行了计算。采用光学显微镜,扫描电镜和电子探针技术,系统研究了多组元Al基合金Al356.1定向凝固的显微组织及显微偏析。计算模拟了3个多组元Al合金(Al356.1,Al356.2,Al518.2)的平衡凝固和非平衡凝固的显微组织及显微偏析。模型计算结果与实测数据很吻合,证实了所建立的多组元体系热力学及动力学数据库的可靠性。更多还原

【Abstract】 The thermodynamic assessments of two quaternary systems Al-Fe-Mg-Si and Al-Fe-Mn-Si were performed, and the reaction temperatures and liquid compositions for invariant equilibria in the Al-rich parts of the quaternary systems Al-Fe-Mg-Si and Al-Fe-Mn-Si were calculated. Systematic investigation on the microstructure and microsegregation of di-rectionally solidified multicomponent alloy A1356. 1 was conducted by using optical microscopy, SEM( scanning electron microscope) and EPMA (electron probe microanalysis) techniques. The microstructure and microsegregation of three multicomponent alloys (A1356. 1, A1356. 2 and A1518. 2) were simulated under the conditions of equilibrium solidification and non-equilibrium solidification. The good agreement between the model-predicted results and the experimental ones demonstrats the reliability of the established thermodynamic and kinetic databases.更多还原