所属单位：国家材料服役安全科学中心
教研室：综合科
发表刊物：Rare Metal Materials and Engineering
项目来源：国家自然科学基金项目
关键字：Aluminum alloy; Fatigue; Microarc oxidation; Surface mechanical attrition treatment
摘要：SMAT-MAO composite coating, consisting of a bottom nanocrystalline layer and a top ceramic coating, was designed and fabricated on the surface of 2024 Al alloy. The microstructure and phase composition of SMAT-MAO coating was examined using X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The fatigue life of the treated alloy was evaluated. The results indicate that the SMAT-MAO coated samples with 5 and 10 μm thick ceramic coatings exhibit improved fatigue lifetime, increasing by 21.9 and 23.2%, respectively. The improved fatigue property is attributed to the combined effect of nanocrystalline structure and residual compressive stress induced in the substrate near the ceramic coating. With ceramic coating thickness increasing to 15 μm, the fatigue lifetime of the SMAT-MAO coated sample is lightly reduced due to the protrudent degrading effect caused by the much bigger pores and pre-existed micro cracks on the coating surface.
第一作者：文磊
卷号：43
期号：7
页面范围：2
字数：2
ISSN号：1002-185X
是否译文：否