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- W1965576980 abstract "Titanium aluminide based pre-alloyed powder is difficult to consolidate by pressureless sintering. The effect of a small addition of nickel (Ni) on the sintering, sintered microstructure, and mechanical properties of a Ti–45Al–5Nb–0.2C–0.2B alloy, compacted from pre-alloyed powder, has been investigated. The relative density of the alloy, sintered at 1375 °C for 60 min, increased progressively from 74% to >99% with increasing Ni content from 0% to 1.25 at.%. The addition of Ni leads to the formation of an intermediate hexagonal-structured Al3NiTi2 phase (known as the τ3 phase) during heating prior to reaching 1150 °C. The presence of the τ3 phase enables the formation of a Ni-containing sintering liquid through three reactions between 1250 °C and 1350 °C: τ3 + γ → Liquid, τ3 + γ → Liquid + α and τ3 + α → Liquid. The sintering shrinkage of the powder blend Ti–45Al–5Nb–0.2C–0.2B–1.25Ni occurs mostly before reaching the isothermal sintering temperature (1375 °C). Consequently, the sintered density increases only marginally during the subsequent isothermal sintering at 1375 °C from 15 min to 60 min and remains unchanged afterwards. However, achieving a near full lamellar structure requires a longer isothermal hold (120 min) at the single α phase region. The as-sintered Ti–45Al–5Nb–0.2C–0.2B–1.25Ni alloy shows compression strength of 2200 ± 50 MPa, yield strength of 750 ± 20 MPa, and strain to fracture of 28 ± 0.5%." @default.
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- W1965576980 date "2013-11-01" @default.
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- W1965576980 title "The effect of a small addition of nickel on the sintering, sintered microstructure, and mechanical properties of Ti–45Al–5Nb–0.2C–0.2B alloy" @default.
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- W1965576980 doi "https://doi.org/10.1016/j.jallcom.2013.05.104" @default.
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