Morphology stability of Al₃BC phase in aluminum alloys

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• 作者：Wenjie Tian ; Pengting Li ; Xiangfa Liu
• 关键词：Al3BC ; Morphology ; Crystal growth ; Aluminum
• 刊名：Journal of Alloys and Compounds
• 出版年：15 January, 2014
• 年：2014
• 卷：583
• 期：Complete
• 页码：329-334
• 全文大小：3315 K

文摘

In this work, Al₃BC was synthesized as the main reaction product in an Al-8B-2C master alloy by using the liquid-solid sintering reaction method. Morphologies of Al₃BC crystals were investigated by field emission scanning electron microscopy (FESEM), which indicated that the morphology as well as the size of Al₃BC remain stable at 1073-1573 K and its growth mechanism was also discussed. Since facets have the highest growth rate, Al₃BC crystal tends to form the hexagonal prism (equilibrium crystal shape), with and {0 0 0 1} (or {0 0 0 3}) facets being exposed. However, Al₃BC crystal also appears in tetrakaidecahedron (non-equilibrium shape), caused by the melt environment. Furthermore, the effect of Al₃BC on the tensile strength and elongation of A356 alloy was studied. This work enriches the morphological characteristics about Al₃BC and puts forward a new strengthening phase in particle-reinforced composite area.