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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。
In this paper, the internal oxidation products and distribution of Cu Al alloy were studied by TEM, EDS and X-ray diffraction, and the formation mechanism of Al 2 O 3 was discussed. The results show that there are three kinds of α, γ and θ morphologies of Al 2 O 3 particles formed during internal oxidation. Nanoscale γ Al 2 O 3 uniformly distributed in the crystal Cu matrix, the average particle size of 7nm, the average spacing of 30nm. A large amount of Al 2 O 3 segregates at grain boundaries or grain boundaries, which is why Cu Al 2 O 3 composites have high grain aspect ratio. The morphology and structure of Al 2 O 3 obtained by internal oxidation are closely related to the concentration, distribution and relative diffusion rate of Al and O.