Ni75AlxV25-x合金沉淀相粗化行为的微观相场模拟

金属学报

2006, Vol. 42

Issue (3): 239-244

论文

本期目录 | 过刊浏览

Ni75AlxV25-x合金沉淀相粗化行为的微观相场模拟

李永胜;陈铮;卢艳丽;王永欣

西北工业大学材料学院

MICROSCOPIC PHASE-FIELD SIMULATION OF COARSENING BEHAVIOR OF PRECIPITATE OF Ni75AlxV25-x ALLOY

引用本文:

李永胜; 陈铮; 卢艳丽; 王永欣 . Ni75AlxV25-x合金沉淀相粗化行为的微观相场模拟[J]. 金属学报, 2006, 42(3): 239-244 .

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摘要: 基于共格应变的微观弹性理论和微观相场动力学模型，模拟了Ni75AlxV25-x合金沉淀过程的组织演化和粗化行为。结果表明：两种沉淀相颗粒在粗化阶段均表现出明显的取向性。相在其两个不同取向上分布不同，在沿[100]方向的生长趋势明显超过[001]方向，相沿<001>方向排列。先析出相的长大和粗化两个阶段比较分明，后析出相的长大和粗化过程同时进行。两种有序相发生粗化以相邻颗粒碰撞并融合为较大颗粒的方式进行。不同浓度的合金两相析出先后顺序及体积分数不同，但最终形貌基本一致，两相均呈长方块状分布，并且具有(001) //{100} 的取向关系。

关键词 ： Ni75AlxV25-x沉淀, 共格应变粗化微观相场

Abstract：Based on the microelasticity theory of coherent strain and the microscopic phase-field dynamic model, the morphology evolution and the coarsening behavior of Ni75AlxV25-x alloy during precipitation was simulated. The precipitates particles have the obvious orientation for the two phases when the coarsening happened. The [100] directions of phases are the preference orientation during the growth, and aligned along the <001> directions. The growth and coarsening of the first precipitates have two evident stage，but growth and coarsening of the last precipitates are proceeding simultaneously. The growth and coarsening of precipitates are take place by means of the coalescence between neighboring particles. In despite of the precipitation order and the volume fraction are different for different concentration, the morphology of two phases is almost same at last, which has the quadrate shape, and the orientation relationship of (001) //{100} is exist between two phases.

Key words： Ni75AlxV25-x precipitation coherent strain coarsening microscopic phase-field

收稿日期: 2005-06-21

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