中文摘要：

针对多相粉末体系，建立描述其烧结过程的相场模型。在该模型中，界面由不同成分的各相混合组成，通过热力学平衡确定界面中各相的成分：除了体扩散之外，也同时考虑了界面扩散和表面扩散。所建的模型被应用到Fe-Cu粉末的烧结过程。结果表明，该模型能够定量地描述烧结过程中的微观组织演变以及溶质扩散等现象。

英文摘要：

A thermodynamic consistent phase field model is developed to describe the sintering process with multiphase powders. In this model, the interface region is assumed to be a mixture of different phases with the same chemical potential, but with different compositions. The interface diffusion and boundary diffusion are also considered in the model. As an example, the model is applied to the sintering process with Fe-Cu powders. The free energy of each phase is described by the well-developed thermodynamic models, together with the published optimized parameters. The microstructure and solute distribution during the sintering process can both be obtained quantitively.