Cu-Al合金内氧化产物及分布的研究

Study on internal oxidation product of Cu-Al alloy and its distribution

本文利用TEM、EDS和X射线衍射研究了Cu Al合金的内氧化产物及分布 ,探讨了Al2 O3 的形成机理。结果表明 :内氧化过程中形成的Al2 O3 粒子共有α、γ、θ三种形态结构。纳米级γ Al2 O3 均匀分布在晶内Cu基体上 ,平均粒径 7nm ,间距平均 30nm。大量Al2 O3 偏聚在晶界或颗粒边界上 ,这是Cu Al2 O3 复合材料具有高晶粒长宽比的原因。内氧化所得Al2 O3 的形态结构与Al、O的浓度、分布及相对扩散速率密切相关。

Internal oxidation product of Cu Al alloy and its distribution were investigated using TEM, EDS and X ray diffraction The forming mechanism of alumina was also examined Three kinds of morphology are found with the alumina particles formed during internal oxidation and a tri morphology distribution is presented The nano γ Al 2O 3 particles are uniformly distributed in the copper grains The mean size and distance between γ Al 2O 3 particles are 7nm and 30nm respectively A large amount of alumina are agglomerated at grain and particle boundaries, and it caused high grain aspect ratio in the Cu Al 2O 3 composite The morphology of alumina obtained by internal oxidation is closely related to the concentration, distribution and relative diffusion coefficient of aluminum and oxygen