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Study on Ti2AlC/TiAl composites with doping Ti3AlC2 by SPS
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    Abstract:

    Ti3AlC2 ceramics were fabricated by in-situ reaction in the 2TiC-Ti-1.2Al system. Ti2AlC/TiAl composites were prepared by spark plasma sintering technology in the 59.2Ti-30.8Al-10Ti3AlC2(wt%) system. The phase composition and microstructure of the specimens were analyzed by XRD and SEM methods. The room temperature mechanical properties were also measured. The results revealed that the in-situ Ti3AlC2 materials mainly consisted of Ti3AlC2 and TiC phases. Ti3AlC2 ceramics present layered structure and TiC particles distribute around the grain boundaries. The Ti2AlC/TiAl composites prepared by SPS mainly consist of TiAl, Ti3Al and Ti2AlC phases. Ti2AlC reinforcements are mainly distributed in the matrix grain boundaries, which show grain-boundary strengthening or intracrystalline strengthening effect. The density, Vickers hardness, fracture toughness and flexural strength of the Ti2AlC/TiAl composites are 3.85 g/cm3, 5.37 GPa, 7.17 MPa, 7.17 MPa?m1/2 and 494.85 MPa respectively.

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[Ai Taotao, Wang Wei, Yu Qi, Li Wenhu, Jiang Peng, Yuan Xinqiang, Bo Haiwa, Fei Yanhan. Study on Ti2AlC/TiAl composites with doping Ti3AlC2 by SPS[J]. Rare Metal Materials and Engineering,2017,46(S1):1~4.]
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History
  • Received:May 11,2016
  • Revised:May 11,2016
  • Adopted:August 08,2017
  • Online: December 13,2017
  • Published: