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使用Ｘ射线衍射仪和显微硬度计测定了ＬＹ１２铝合金微等离子体氧化陶瓷膜沿深度方向 的相分布及显微硬度变化曲线．结果表明，铝合金微等离子体氧化陶瓷膜主要由 α－Ａｌ_２Ｏ_３、γ－ Ａｌ_２Ｏ_３相组成，从表层到里层，α－Ａｌ_２Ｏ_３相含量逐渐增加．膜的显微硬度沿深度方向变化同 α－ Ａｌ_２Ｏ_３含量变化一致，致密层中显微硬度大于 ＨＶ１５００，极值点达到 ＨＶ２３００．
The phase distribution and micro-hardness curve of LY12 aluminum micro-plasma oxidation ceramic membrane in the depth direction were measured by X-ray diffraction and microhardness tester. The results show that the micro-plasma oxidation of aluminum alloy mainly consists of α-Al 2 O 3 and γ-Al 2 O 3 phases, and the content of α-Al 2 O 3 phase increases gradually from the surface to the inside. The change of microhardness of the film along the depth direction is consistent with that of the α-Al 2 O 3. The microhardness of the dense layer is greater than HV 1500 and the extreme point is HV 2300.