温度对Al-11.4%Li合金沉淀机制影响的微观相场模拟  

Microscopic Phase-field Simulation for Temperature Influence on Precipitation Mechanism of Al-11.4% Li Alloy

作　　者：苗海川[1] 王永欣[1] 陈铮[1] 钟汉文[1] 孙立岩[1] 

机构地区：[1]西北工业大学材料学院,西安710072

出　　处：《有色金属》2010年第4期12-17,共6页Nonferrous Metals

基　　金：国家自然科学基金资助项目(50941020;10902086;50875217)

摘　　要：利用微观相场法模拟Al-11.4%Li合金时效过程中的微观组织。从模拟结果可以看出,该合金在383,423和493K下沉淀机制分别为失稳分解,非经典形核与失稳分解的混合机制和非经典形核长大。随温度的升高,新相颗粒逐渐规则,溶质原子的簇聚程度以及体系整体的有序化程度都在不断的降低。The microstructure of Al-11.4% Li alloy in aging process is investigated with microscopic phase-field method. The simulation results show that the precipitation mechanism of this alloy is the spinodal decomposition, the mixture of nonclassical nucleation and spinodal decomposition, and the nonclassical nucleation at 383, 423 and 493K, respectively. With the increase of temperature, the shape of new grain gradually becomes regular, the degree of solute atomic clustering and the ordering are both gradually decreased.

关 键 词：金属材料 AL-LI合金 微观相场 沉淀机制 

分 类 号：TG146.21[一般工业技术—材料科学与工程]