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采用扩散界面场模型对非对称成分点及拐点以下成分点同构两相分解过程中应力场(包括外场)对析出相的形态及动力学过程的影响作了比较系统的研究。模拟结果表明:对于各向异性系统在相分解过程中由于弹性应变能与界面能间的相互作用将会导致析出相在不同阶段呈现不同的形貌如网格结构、三明治多畴结构、沉淀宏观点阵结构以及板条状等;对于非均匀弹性模量系统在外加应力场作用下,沉淀相的析出过程发生重大的变化,粒子沿弹性软方向呈各向异性析出。此外,模拟结果还发现,在应力场(包括外加场情况)存在条件下,相析出的中前期长大过程中小粒子沿着弹性软方向相互联结成大粒子,在相变后期孤立的小粒子被大粒子的长大所消耗。
The diffusion field model is applied to study the influence of stress field (including the external field) on the morphologies and kinetic processes of the precipitates during the process of isomorphic two-phase decomposition below the inflection points. The simulation results show that due to the interaction between the elastic strain energy and the interfacial energy in the phase decomposition process of anisotropic system, the precipitation phase will show different morphologies at different stages such as grid structure, sandwich multi-domain structure, precipitation macroscopic Lattice structure and slab shape. For the inhomogeneous elastic modulus system, the precipitation process of precipitation phase changes greatly under the applied stress field. The particles are anisotropically deposited along the elastic soft direction. In addition, the simulation results also show that in the presence of stress field (including the applied field), the small particles in the mid-early phase of the phase precipitation grow into large particles along the elastic soft direction and the isolated small particles in the late phase The growth of large particles consumed.