相场法模拟扩散场相互作用对沉淀相形貌及成分的影响  

PHASE-FIELD SIMULATION OF THE EFFECT OF DIFFUSIONAL INTERACTION ON PRECIPITATE MORPHOLOGY AND COMPOSITION

作　　者：张玉祥[1] 王锦程[1] 杨玉娟[1] 杨根仓[1] 周尧和[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《金属学报》2007年第10期1107-1112,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金50401013

摘　　要：在把网格引入的各向异性的影响降低到合理范围的基础上,采用相场法研究了在无弹性场作用时,沉淀颗粒间的扩散场相互作用对沉淀相形貌及成分的影响.模拟结果表明:由于扩散场的相互作用,在沉淀相生长及粗化过程中,沉淀颗粒形貌可出现圆形→方形→圆形→菱形→圆形的多种变化,且沉淀内部呈现成分不均匀性.随着沉淀相体积分数的增大,沉淀颗粒间的扩散场相互作用加强,对沉淀相形貌及其成分的影响也更加显著.With a reasonable mesh-induced anisotropy, the phase-field simulation was performed to investigate the effect of the diffusional interaction between particles on morphologies and inside compositions of precipitates without taking elastic interaction into account. Simulated results show that the morphology transition will occur during growth and coarsening of the precipitate due to the interaction. The initially rounded particle may vary in the sequence of circular→square→circular→ rhombic→circular, and the composition of precipitate will become inhomogeneous. With increasing precipitate volume fraction, the influence of the inter-particle diffusional interaction on the precipitate morphology and the composition will become stronger.

关 键 词：相场法 沉淀组织 扩散场 相互作用 

分 类 号：TG111.6[金属学及工艺—物理冶金]