Ni-Al合金中沉淀相Ni_3Al相互关系的微观相场模拟(英文)  

Microscopic Phase-Field Simulation for Correlations of Ni_3Al Precipitates in Ni-Al Alloys

作　　者：卢艳丽[1] 陈铮[1] 钟汉文[1] 张静[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2009年第11期1890-1893,共4页Rare Metal Materials and Engineering

基　　金：Supported by the National Natural Science Foundation of China(50671084);China Postdoctoral Science Foundation(20070420218);Natural Sci-ence Foundation of Shaanxi Province

摘　　要：基于微观相场动力学模型和微观弹性理论,研究了Ni-Al合金中沉淀相Ni3Al(γ′)形貌演化、体积分数以及铝浓度对其相互关系的影响。结果表明,对于所有浓度的合金,沉淀后期,γ′相均沿着[001]和[010]方向规则排列,但是彼此之间存在着不同的相互关系。对于低铝浓度合金,γ′相之间彼此互相独立。对于中铝浓度的合金,γ′相之间主要存在着4种相互关系:L-状,双透镜状,三重组结构和四重组结构。对于高铝浓度的合金,γ′相之间主要呈现双透镜状关系。The effect of Al concentration on the correlations of Ni3Al precipitates （79 in Ni-Al alloys was studied based on the microscopic phase-field kinetic model and the microelasticity theory. The simulation results show that γ precipitates are arranged along the [001] and [010] directions regarding alloys with all concentration, but there exists different correlations. For the alloy with lower Al concentration, γ precipitates are independent each other; for the alloy with medium Al concentration, there are mainly four types correlations among the γ precipitates： L-shaped pattern, doublet pattern, triplet pattern and quartet pattern; for the alloy with higher Al concentration, the correlation of γ precipitates is mainly doublet pattern.

关 键 词：微观相场 弹性应变 形貌演化 沉淀过程 NI-AL合金 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TU998.12[金属学及工艺—金属材料]