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Synthesis, Microstructure, and Mechanical Properties of Al3BC3

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In situ synthesis of bulk Al3BC3 was achieved via a reactive hot-pressing method using Al, B4C, and graphite powders at 1800°C for 2 h. The reaction path for synthesizing Al3BC3 was investigated. It was found that Al3BC3 formed via the reaction of C, B4C, and Al4C3 above 1180°C. Dense Al3BC3 was prepared with a little B4C and graphite remained. Microstructure observations revealed the plate-like morphology of Al3BC3 grains. Moreover, the mechanical properties of Al3BC3 were characterized (Vickers hardness of 11.1 GPa, bending strength of 185 MPa, fracture toughness of 2.3 MPa·m1/2, and Young's modulus of 163 GPa). Young's modulus decreased slowly with increasing temperature, and at 1600°C remained 79% of that at ambient temperature. These results show that Al3BC3 is a promising lightweight high temperature structural material.

Document Type: Research Article


Affiliations: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Publication date: July 1, 2008

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