论文部分内容阅读
采用Calphad方法对Al-Fe-Mn-Si四元系及其子体系进行热力学评估。首先,通过考虑文献中最新的实验研究结果以及对部分三元化合物应用新的热力学模型,修正Al-Fe-Si三系的热力学描述,显著地改善了整个成分范围内、尤其是富Al角的液相面投影图。随后,对三元化合物α-AlMnSi和β-AlMnSi采用新的模型,精修Al-Mn-Si体系富Al角的热力学描述。然后,通过模拟α-AlMnSi相在Al-Fe-Mn-Si体系中的固溶度,优化Al-Fe-Mn-Si四元系富Al角的热力学描述。在优化时,对α-AlMnSi作特殊考虑并加入限制条件,以确保其不会在Al-Fe-Si三元系中变得稳定。最后,将所获得的热力学描述加入TCAL数据库,通过一系列的相平衡计算与凝固模拟、以及与商业铝合金的实验数据的比较,对所获得的热力学描述进行全面的验证。更新后的TCAL数据库能够可靠地预测Al-Fe-Si基与Al-Fe-Mn-Si基合金中的相形成。
The thermodynamics of Al-Fe-Mn-Si quaternary system and its subsystems was evaluated by Calphad method. Firstly, by amending the latest experimental results in the literature and applying a new thermodynamic model to some ternary compounds, the thermodynamic description of the Al-Fe-Si tri-series was amended to significantly improve the overall composition, especially the Al-rich Liquid phase projection map. Subsequently, a new model of ternary compounds α-AlMnSi and β-AlMnSi was used to refine the thermodynamic description of the Al-rich Al-Mn-Si system. Then, the thermodynamic description of Al-Fe-Mn-Si quaternary Al-rich corners was optimized by simulating the solid solubility of α-AlMnSi phase in Al-Fe-Mn-Si system. In the optimization, special consideration is given to α-AlMnSi with the addition of constraints to ensure that it does not become stable in the Al-Fe-Si ternary system. Finally, the obtained thermodynamic description was added into the TCAL database. The thermodynamic description obtained was verified comprehensively through a series of phase equilibrium calculations and solidification simulations, as well as comparison with experimental data of commercial aluminum alloys. The updated TCAL database reliably predicts the phase formation in Al-Fe-Si based and Al-Fe-Mn-Si based alloys.