中文摘要：

通过表面机械研磨处理（SMAT）在LY12CZ铝合金表面制备表面纳米化（SNC）过渡层,再采用微弧氧化（MAO）技术对纳米晶过渡层进行微结构重构,设计制备出纳米化-微弧氧化（SNC-MAO）复合涂层,并对比研究了表面纳米化、微弧氧化及纳米化-微弧氧化复合处理对基体铝合金拉伸性能的影响。结果表明,微弧氧化处理使基体铝合金的屈服强度和抗拉强度减小,而纳米化-微弧氧化复合处理则增加了基体铝合金的屈服强度和抗拉强度。在拉伸伸长率8%的条件下,相同厚度的纳米化-微弧氧化复合涂层比微弧氧化涂层具有更好的抗拉伸破坏能力,表现出更好的膜基结合性能。

英文摘要：

A duplex process was designed to modify the alloy surface using surface mechanical attrition treatment（SMAT）prior to microarc oxidation（MAO）.A surface nanocrystalline（SNC）layer was formed on the surface of Al alloy by SMAT,on which a ceramic coating grew by MAO,finally the SNC-MAO composite coating are fabricated.The tensile properties of the SMATed alloy,MAO coating and SNC-MAO composite coating were comparatively evaluated.Experimental results show that the yield strength and tensile strength of the substrate Al alloy are reduced after MAO treatment,while those of SNC-MAO treated samples are improved due to the introduction of SMAT pre-treatment.When the elongation is 8%,SNC-MAO coating shows better tensile and adhesion properties compared with MAO coating with the same thickness.