Sa Ma

Central South University | CSU · Powder Metallurgy Research Insitute

金属增材制造涉及传热与传质、相变、晶粒生长、熔体流动等多个复杂物理过程，实现其微结构演变的定量模拟难度大。相场法采用序参量可描述气/液/固相、晶粒形状/取向等复杂微结构，且能直接引入描述各物理过程的场变量（如浓度、温度、熔体流速等），在金属增材制造过程微结构模拟方面显示出巨大优势。本文简要介绍了相场法的发展和分类，归纳了不同相场模型的特点，详细综述了不同相场模型在金属增材制造凝固过程中微结构演化模拟的研究进展，重点探讨了不同相场模型在金属增材制造领域应用的优势与局限性。最后，展望了相场法在金属增材制造领域的应用前景，并指出其发展方向。 Metal additive manufacturing involves many complex physical processes such as h...

The anisotropic atomic mobilities in hcp Zr(O) were first assessed based on all the literature diffusivities along different orientations. The reliable set of atomic mobilities in hcp Zr(O) was then chosen through comprehensive comparison between the model-predicted diffusion properties with the experimental/theoretical data. It was interestingly f...

The atomic mobility descriptions for Y and O in both α-Y(O) and α-Y2O3 were first assessed by means of CALculation of PHAse Diagram approach based on the critically-reviewed diffusivities available in the literature. The diffusion anisotropy in α-Y(O) with hcp structure and the short-circuit diffusion in both α-Y(O) and α-Y2O3 were taken into accou...

In this paper, we developed a novel analytical approach for description of the diffusion-controlled simultaneous growth of multilayer stoichiometric compounds in binary reactive diffusion couples. The approach was directly extended to describe the compounds with narrow/certain homogeneity ranges. The models were then applied to three different real...

A variety of experimental tracer diffusivities of Mg and O in magnesium oxide available in the literature were first assessed. Atomic mobilities including bulk and short-circuit diffusion of Mg and O were then obtained by means of the CALPHAD (CALculation of Phase Diagram) approach. Afterwards, the diffusion-controlled kinetic model of oxidation in...