LY12铝合金微弧氧化陶瓷膜的纳米压入研究  

Study of Nanoindentation of Ceramic Coatings Formed on LY12Aluminum Alloy by Microarc Oxidation

作　　者：薛文斌[1] 邓志威[1] 陈如意[1] 张通和[1] 

机构地区：[1]北京师范大学,北京市辐射中心北京100875

出　　处：《稀有金属材料与工程》2001年第4期281-285,共5页Rare Metal Materials and Engineering

基　　金：国家"863"高科技计划 ( 863 - 715 - 0 11- 0 2 0 );国家自然科学基金青年基金 ( 5 980 10 0 3 )资助项目

摘　　要：用纳米压入法测定了 L Y12铝合金微弧氧化陶瓷膜的硬度 H和弹性模量 E分布 ,并探讨了陶瓷氧化膜的生长机理。氧化膜的硬度和弹性模量分别为 18GPa～ 3 2 GPa,2 80 GPa～ 3 90 GPa。靠近膜 /基体界面的氧化膜硬度和弹性模量仍然相当高。 H和 E沿膜深度的分布都存在一个极大值 ,并同膜内α- Al2 O3含量变化是一致的。其形成原因在于微弧区熔融物在膜不同部位冷却速率差异较大。Distributions of microhardness, H, and elastic modulus, E, in ceramic coatings formed on LY12 aluminum alloy by microarc oxidation were determined using a nanoindentation method. The experimental results indicate that the hardness and elastic modulus are in the ranges of 18 GPa similar to 32 GPa and 280 GPa similar to 390 GPa, respectively. H and E are still rather high even at the oxide coating near the Al/Al2O3 interface. In addition, Each of distribution curves of H and E along the depth of the coatings has a maximum value, which is consistent with the change of alpha -Al2O3 content in the coating. The changes of H, E and alpha -Al2O3 content from Al substrate to the coating surface result from the difference of cooling rate of molten alumina in microarc zone at the different depths of the coating. The formation mechanism of the coating is also discussed in detail.

关 键 词：微弧氧化 纳米压入 铝合金 弹性模量 显微硬度 陶瓷膜 

分 类 号：TG174.45[金属学及工艺—金属表面处理]