Laboratory of Magnetism and Spectroscopy of Solids, Physics Department, Faculty of Science, Badji-Mokhtar University, Annaba, Algeria.
J Xray Sci Technol. 2010;18(2):201-19. doi: 10.3233/XST-2010-0245.
This article deals with the microstructural strengthening mechanisms of aluminium by means of hard alpha-Al(2)O(3) alumina fine particles. A broad of understanding views covering materials preparations, elaboration process, characterization techniques and associated microstructural characteristic parameters measurements is given. In order to investigate the microstructural characteristic parameters and the mechanical strengthening mechanisms of pure aluminium by hard fine particles, a set of Al-(alpha-Al(2)O(3)) alloys samples were made under vacuum by high fusion temperature melting, the high frequency (HF) process, and rapidly solidified under ambient temperature from a mixture of cold-compacted high-pure fine Al and alpha-Al(2)O(3) powders. The as-solidified Al-(alpha-Al(2)O(3)) alloys were characterized by means of X-ray diffraction (XRD) analyses, optical microscopy observations and Vickers microhardness tests in both brut and heat-treated states. It was found that the as-solidified HF Al-(alpha-Al(2)O(3)) alloys with compositions below 4 wt.% (alpha-Al(2)O(3)) are single-phase microstructures of the solid solution FCC Al phase and over two-phase microstructures of the solid solution FCC Al and the Rhombohedral alpha-Al(2)O(3) phases. The optical micrographs reveal the presence of a grain size refinement in these alloys. Vickers microhardness of the as-solidified Al-(alpha-Al(2)O(3)) is increased by means of pure fine alpha-Al(2)O(3) alumina particles. These combined effects of strengthening and grain size refinement observed in the as-solidified Al-(alpha-Al(2)O(3)) alloys are essentially due to a strengthening of Al by the alpha-Al(2)O(3) alumina particles insertion in the (HF) melted and rapidly solidified alloys.
本文通过硬 α-Al(2)O(3)氧化铝细颗粒研究了铝的微观结构强化机制。涵盖了材料制备、细化工艺、表征技术以及相关微观结构特征参数测量等广泛的理解观点。为了研究硬细颗粒对纯铝的微观结构特征参数和力学强化机制，通过高融合温度熔炼、高频（HF）工艺和环境温度下从冷压高纯细 Al 和 α-Al(2)O(3)粉末混合物中快速凝固，制备了一组 Al-(α-Al(2)O(3))合金样品。采用 X 射线衍射（XRD）分析、光学显微镜观察和维氏硬度试验对固溶态 Al-(α-Al(2)O(3))合金进行了表征。结果表明，固溶态 HF Al-(α-Al(2)O(3))合金中（α-Al(2)O(3))的组成低于 4wt.%时为单相固溶体 FCC Al 相和两相固溶体 FCC Al 和菱面体 α-Al(2)O(3)相。光学显微镜照片显示这些合金中存在晶粒细化。固溶态 Al-(α-Al(2)O(3))的维氏硬度通过纯细 α-Al(2)O(3)氧化铝颗粒得到提高。在固溶态 Al-(α-Al(2)O(3))合金中观察到的强化和晶粒细化的综合效应主要归因于 α-Al(2)O(3)氧化铝颗粒在（HF）熔化和快速凝固合金中的插入对 Al 的强化。
