温度对Al-11.4%Li合金沉淀机制影响的微观相场模拟

来源期刊：有色金属2010年第4期

论文作者：苗海川 王永欣 陈铮 钟汉文 孙立岩

文章页码：12 - 17

关键词：金属材料； Al-Li合金； 微观相场； 沉淀机制

Key words：metal material； Al-Li alloy； microscopic phase-field； precipitation mechanism

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。

Abstract: 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.