Properties of NbC–TiAl and TiB2–TiAl composites produced by plasma transferred arc process
Authors: Hirose, A.; Abotani, K.; Aoki, R.; Kobayashi, K. F.
Source: Materials Science and Technology, Volume 12, Number 12, December 1996 , pp. 1057-1063(7)
Publisher: Maney Publishing
Abstract:Intermetallic compound based composites (IMCs) consisting of particles of NbC and TiB2 in Ti–36 wt-%Al (NbC–TiAl and TiB2–TiAl respectively), with varying volume fraction of reinforcing particles, were produced by a plasma transferred arc process. In NbC–TiAl IMCs, the hardness and 0·2% compressive proof stress increased steadily with increasing volume fraction of NbC whereas the tensile strength was lower than that of the unreinforced TiAl regardless of the volume fraction of NbC. In TiB2–TiAl IMCs, the hardness and 0·2% compressive proof stress exhibited maximum values at a volume fraction of 5 vol.-%TiB2. The maximum tensile strength of ˜500 MN m−2, which is almost twice that of the unreinforced TiAI, was obtained at a volume fraction of 5 vol.-%TiB2. The initial improvement of mechanical properties due to the addition of TiB2 was considered to be caused by the reinforcing effect of the TiB2 particles, grain refinement, and the disappearance of γ grains in 3–5 vol.-%TiB2–TiAI IMCs. The deterioration of the mechanical properties observed for a volume fraction of >5 vol.-%TiB2 may be attributed to the increase in the amount of γ grains with increasing volume fraction of TiB2 particles from 7 to 15 vol.-% and the increase in coarse TiB2 particles that can act as crack initiation sites in tensile tests.
Document Type: Research Article
Publication date: 1996-12-01
Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.Materials Science and Technology is the successor of two previous titles, for which digitised archives are available: Metal Science (Vols. 1—17; 1967—84) and Metals Technology (Vols. 1—11; 1974—84).
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