Abstract
A gas-atomized (GA) prealloyed powder of the Ti-48Al-2Cr-2Nb intermetallic and 1.6 wt pct Y were mechanically alloyed (MA) and hot isostatically pressed (hipped) to produce a fully dense nanocrystalline material. Mechanical alloying of the as-blended powder for 16 hours resulted in the formation of a disordered fcc phase. Hipping of the alloy powder produced a single-phase nanocrystalline TiAl intermetallic, containing a distribution of 20 to 35-nm-sized Al2Y4O9 particles. The formation of oxide particles occurred by the chemical combination of Al and Y with oxygen, which entered as a contaminant during milling. Oxide particles increased the hardness of the intermetallic compound and minimized grain growth even at 0.8 T m , where T m is the melting point of the compound.
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Trivedi, P.B., Patankar, S.N., (Sam) Froes, F.H. et al. Grain-size control in Ti-48Al-2Cr-2Nb with yttrium additions. Metall Mater Trans A 33, 2729–2736 (2002). https://doi.org/10.1007/s11661-002-0395-8
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DOI: https://doi.org/10.1007/s11661-002-0395-8