李永胜
,
陈铮
,
卢艳丽
,
王永欣
金属学报
doi:10.3321/j.issn:0412-1961.2006.03.003
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.θ相(Ni3V)沿[100]方向的生长趋势明显超过[001]方向,γ′相(Ni3Al)沿<001>方向排列.二相析出顺序与Al含量有关,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)θ//{100}γ′的取向关系.
关键词:
Ni75AlxV25-x
,
沉淀
,
共格应变
,
粗化
,
微观相场
李永胜
,
陈铮
,
卢艳丽
,
王永欣
金属学报
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
,
precipitation
Yongsheng LI
材料科学技术（英文）
The interphase boundary evolution of ordered phase in Ni75AlxV25-x alloy during precipitation was simulated on atomic-scale based on the microscopic phase-field dynamic model. The results show that the second phase precipitated from the interphase boundary formed by the first phase and the disordered matrix at high temperature, and from the interphase boundaries of the first phase at low temperature. L12 phase had obvious selective orientation when precipitated from the interphase boundaries of D022. L12 phase nucleated easily at the interphase boundaries formed by [10] and [01] directions of D022 projection along [001] direction, and grew easily at [10] direction. There was no the selective orientation when L12 phase precipitated from the interphase boundary formed by D022 and the disordered matrix. D022 phase had the selective orientation when precipitated from the interphase boundaries of L12, and grew along the [10] direction.
关键词:
Microscopic phase-field
,
null
,
null
,
null
,
null
Yongsheng LI
,
Zheng CHEN
材料科学技术（英文）
The interrupted aging mechanisms were applied to Ni75Al2.9V22.1 alloy by using the microscopic phase-field simulation method. For the single phase region existing at high temperature, the low content alloy was used as the study object. With the progressive aging mechanisms, the metastable phase γ' of high temperature can be obtained from the low temperature two phase regions, and the quantity of γ' phase reduces with increasing temperature. The θ single phase morphology at high temperature regions will turn to be the γ'+θ two phase morphology at low temperature with the interrupted aging method. Despite of the different precipitation paths of γ' phase, the precipitation mechanisms are the same for the low temperature aging and high temperature interrupted aging.
关键词:
Microstructure
,
null
,
null
,
null
