Grain-size control in Ti-48Al-2Cr-2Nb with yttrium additions

P. B. Trivedi; E. G. Baburaj; A. Genç; L. Ovecoglu; S. N. Patankar; F. H. Froes

doi:10.1007/s11661-002-0395-8

Grain-size control in Ti-48Al-2Cr-2Nb with yttrium additions

P. B. Trivedi, E. G. Baburaj, A. Genç, L. Ovecoglu, S. N. Patankar, F. H. Froes

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

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.

Original language	English
Article number	395
Pages (from-to)	2729-2734
Number of pages	6
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	33
Issue number	8
DOIs	https://doi.org/10.1007/s11661-002-0395-8
Publication status	Published - 2002
Externally published	Yes

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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 Tm, where Tm is the melting point of the compound.",

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AU - Trivedi, P. B.

AU - Baburaj, E. G.

AU - Genç, A.

AU - Ovecoglu, L.

AU - Patankar, S. N.

AU - Froes, F. H.

PY - 2002

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ER -

Grain-size control in Ti-48Al-2Cr-2Nb with yttrium additions

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