Fine structure and interface characteristic of ¦Á-Al₂O₃ in molybdenum alloy

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• 作者：Liujie Xu ; Shizhong Wei ; D ; an Zhang ; Yan Li ; Guoshang Zhang ; Jiwen Li
• 关键词：¦Á-Al2O3 ; Molybdenum alloy ; Stacking fault ; Nanograin ; Interface
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：41
• 期：Complete
• 页码：483-488
• 全文大小：2597 K

文摘

Molybdenum alloy reinforced with 10 vol. % alumina (¦Á-Al₂O₃) was prepared using the sol-gel process combined with the powder metallurgy method. The fine structure of ¦Á-Al₂O₃ and the interface structure of ¦Á-Al₂O₃/Mo are analyzed using high-resolution electron microscopy. Systematic analysis reveals that the ¦Á-Al₂O₃, exhibiting polyhedron shape, had a stacking fault substructure. The fine structure of ¦Á-Al₂O₃ grains is characterized as the orderly stacking of several amorphous and crystalline ¦Á-Al₂O₃ nanograins. It is observed that an interfacial bonding zone of dimension 3-5 nm existed between ¦Á-Al₂O₃ and molybdenum grain. In the bonding zone, the atomic arrangement was similar to the structure of ¦Á-Al₂O₃, yet it is relatively disordered. The crystallographic orientations at the interface can be illustrated as ¦Á-Al₂O₃ [122]//Mo [11(¡ª)0] and ¦Á-Al₂O₃ (201(¡ª))//Mo (110).