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Evaluation of precipitation hardening in TiC-reinforced Ti2AlNb-based alloys

Journal Article


Abstract


  • Ti2AlNb-based alloys with 0.0wt%, 0.6wt%, and 2.0wt% carbon nanotube (CNT) addition were fabricated from spherical Ti���22Al���25Nb powder by sintering in the B2 single-phase region. Phase identification and microstructural examination were performed to evaluate the effect of carbon addition on the hardness of the alloys. Carbon was either in a soluble state or in carbide form depending on its concentration. The acicular carbides formed around 1050��C were identified as TiC and facilitated the transformation of ��2 + B2 ��� O. The TiC was located within the acicular O phase. The surrounding O phase was distributed in certain orientations with angles of 65�� or 90�� O phase particles. The obtained alloy was composed of acicular O, Widmanstatten B2 + O, and acicular TiC. As a result of the precipitation of carbides as well as the O phase, the hardness of the alloy with 2.0wt% CNT addition increased to HV 429 �� 9.

Publication Date


  • 2018

Citation


  • Zhang, Y. R., Cai, Q., Liu, Y. C., Ma, Z. Q., Li, C., & Li, H. J. (2018). Evaluation of precipitation hardening in TiC-reinforced Ti2AlNb-based alloys. International Journal of Minerals, Metallurgy and Materials, 25(4), 453-458. doi:10.1007/s12613-018-1591-x

Scopus Eid


  • 2-s2.0-85045304794

Start Page


  • 453

End Page


  • 458

Volume


  • 25

Issue


  • 4

Place Of Publication


Abstract


  • Ti2AlNb-based alloys with 0.0wt%, 0.6wt%, and 2.0wt% carbon nanotube (CNT) addition were fabricated from spherical Ti���22Al���25Nb powder by sintering in the B2 single-phase region. Phase identification and microstructural examination were performed to evaluate the effect of carbon addition on the hardness of the alloys. Carbon was either in a soluble state or in carbide form depending on its concentration. The acicular carbides formed around 1050��C were identified as TiC and facilitated the transformation of ��2 + B2 ��� O. The TiC was located within the acicular O phase. The surrounding O phase was distributed in certain orientations with angles of 65�� or 90�� O phase particles. The obtained alloy was composed of acicular O, Widmanstatten B2 + O, and acicular TiC. As a result of the precipitation of carbides as well as the O phase, the hardness of the alloy with 2.0wt% CNT addition increased to HV 429 �� 9.

Publication Date


  • 2018

Citation


  • Zhang, Y. R., Cai, Q., Liu, Y. C., Ma, Z. Q., Li, C., & Li, H. J. (2018). Evaluation of precipitation hardening in TiC-reinforced Ti2AlNb-based alloys. International Journal of Minerals, Metallurgy and Materials, 25(4), 453-458. doi:10.1007/s12613-018-1591-x

Scopus Eid


  • 2-s2.0-85045304794

Start Page


  • 453

End Page


  • 458

Volume


  • 25

Issue


  • 4

Place Of Publication