表面纳米化-微弧氧化复合涂层对铝合金拉伸性能影响机制研究  

Influence of SNC-MAO Composite Coating on Tensile Properties of Aluminum Alloy

作　　者：文磊[1] 王亚明[2] 金莹[1] 

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083 [2]哈尔滨工业大学特种陶瓷研究所,哈尔滨150080

出　　处：《材料工程》2016年第3期15-20,共6页Journal of Materials Engineering

基　　金：国家自然科学基金(51201008);教育部博士点科研基金(20120006120043);高等学校学科创新引智计划(B12012)

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。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.

关 键 词：铝合金 表面纳米化 表面机械研磨处理 微弧氧化 拉伸性能 

分 类 号：TG561[金属学及工艺—金属切削加工及机床]