Effects of Al addition on the phase transformation and interfacial evolution in multilayer Ti-B4C composite |
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Authors: | Chao Wu Shihui Xie Yunkai Li Hanqing Xu Yiwen Chen |
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Affiliation: | 1. School of Materials Science and Engineering, Beijing Institute of Technology, 100081 Beijing, PR China;2. Jiangsu Bree Optronics Co.,Ltd., 210000 Nanjing, PR China |
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Abstract: | The fully-dense multilayer Ti-B4C composite doped with 6 wt% Al was fabricated via tape-casting and hot-pressing sintering at 1800 °C and under a uniaxial pressure of 30 MPa for 60 min. The effects of Al addition on the phase composition, interfacial microstructure and fracture toughness of the laminate composite were investigated. Based on the results of WDS and EDS, Al addition was proved to be effective on accelerating atom diffusion between Ti and B4C due to the melting pool around interface where liquid Al enriched, besides, it helps to transform the interfacial bonding method of physical to metallurgical. Finally, the improvement on toughness of Al doped composite can be attributed to the strong metallurgical bonding and hybrid fracture mode of interface. Our study may provide a potential method for producing high strength and toughness multilayer metal/ceramic composites. |
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Keywords: | Laminate structure Interfacial reaction Al addition |
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