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中文摘要：
采用高能喷丸技术在铝合金表面制备出纳米晶结构层，利用金相显微镜（OM），扫描电子显微镜（SEM／EDS），透射电子显微镜（TEM）及X射线衍射仪（XRD）等设备对高能喷丸铝合金表面层的显微结构及成分进行分析。结果表明：在高能喷丸表面纳米化过程中，弹丸中的Fe，cr原子在强制机械力的作用下转移进入铝合金表面，在材料表层约30μm的深度范围内形成分布不均匀的合金化层。这可能是纳米晶体中大量界面的形成使合金元素原子能够快速扩散和偏聚的结果。
英文摘要：
A nanostructured surface layer was fabricated on aluminum alloy by using a high-energy shot peening （HESP） technique. The microstructure and composition of treated surface layer were analyzed by means of OM, SEM/EDS, TEM and XRD. Experimental results revealed that in the process of surface nanocrystallization induced by HESP, Fe and Cr atoms in the steel shots transferred into aluminum surface under intensive mechanical force and formed an inhomogeneous alloying layer of about 30μm in thickness. This might be attributed to the slather existence of nanocrystalline grain boundaries in favor of the alloying element atoms diffusing fast and aggregation in the grain boundaries.
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