Fabrication of multilayered Ti-Al intermetallics by spark plasma sintering

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• 作者：Yanbo Sun ; Sanjay Kumar Vajpai ; Kei Ameyama ; Chaoli Ma
• 关键词：Ti&ndash ; Al intermetallics ; Spark plasma sintering ; Multilayered microstructures ; Foils
• 刊名：Journal of Alloys and Compounds
• 出版年：5 February, 2014
• 年：2014
• 卷：585
• 期：Complete
• 页码：734-740
• 全文大小：1901 K

文摘

A novel processing method, based on heat treatment and spark plasma sintering (SPS) of elemental foils, has been proposed to prepare the Ti-Al intermetallics. It is demonstrated that the full density compacts with different microstructures, i.e. Ti/Ti-Al intermetallics multilayer, Ti₃Al/TiAl multilayer, or homogeneous Ti-Al intermetallics alloy, can be successfully prepared by controlling the sintering conditions. The results show that the compacts with Ti/Ti-Al intermetallics multilayered structure obtained the better mechanical properties as compared with the multilayered Ti₃Al/TiAl and the homogeneous Ti-Al intermetallics compacts. The better mechanical properties of the multilayered Ti/Ti-Al intermetallics compacts were attributed to the deflection of the moving cracks by the ductile 伪-Ti layer. Therefore, it was found that the unique multilayered structure consisting of alternating Ti and Ti-Al intermetallics layers offers the possibility of improving the fracture toughness.