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On Microstrucitural Evolution in Gas Atomized Ti-50 at.% Al-2 at.% Nb Powder

Published online by Cambridge University Press:  26 February 2011

Donald S. Shih ,
Gary K. Scarr  and
James C. Chesnutt
Donald S. Shih
Affiliation:
Engineering Materials Technology Laboratories, GE Aircraft Engines Mail Drop M-89, 1 Neumann Way, Cincinnati, Ohio 45215-6301, USA
Gary K. Scarr
Affiliation:
Engineering Materials Technology Laboratories, GE Aircraft Engines Mail Drop M-89, 1 Neumann Way, Cincinnati, Ohio 45215-6301, USA
James C. Chesnutt
Affiliation:
Engineering Materials Technology Laboratories, GE Aircraft Engines Mail Drop M-89, 1 Neumann Way, Cincinnati, Ohio 45215-6301, USA
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Abstract

Microstructural development in helium gas atomized Ti-50A1-2Nb (at.%) powder has been characterized using x-ray diffractometry and transmission electron microscopy. The structure of the as-atomized powder was a mixture of two phases: an ordered fct (L10)γ TiAl phase and an hcp α Ti phase containing fine (≈ 10–20 nm) D019 α2 domains. Large powder (≈ 250 μm) contained ≈ 14 volume % hcp phase, while fine powder (≈37 μm) contained ≈ 72 volume % hcp phase. However, this α+α2 constituent was metastable and transformed to the γ phase during annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 167
Copyright
Copyright © Materials Research Society 1989

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References

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