Spinodal decomposition of the gamma-phase upon quenching in the Ti-Al-Nb ternary
Journal Article
·
· Intermetallics
OSTI ID:989717
- ORNL
- University of Florida, Gainesville
The {gamma}-TiAl with L1{sub 0} crystal structure shows extensive solubility for Nb at elevated temperatures. Recently (Rios et al., Acta materialia 2009; 57:6243), we have demonstrated that the high-Nb {gamma}-TiAl phase becomes unstable upon rapid cooling into a nano-scale two-phase microstructure. In this paper, using detailed compositional and microstructural analyses, we have demonstrated that this phase goes through a spinodal decomposition that results in the compositionally distinct phases identified as a lower-Nb {gamma}-phase and the h-phase, which is rich in Nb and forms by the ordering of this element in the {gamma}-phase.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 989717
- Journal Information:
- Intermetallics, Journal Name: Intermetallics; ISSN 0966-9795
- Country of Publication:
- United States
- Language:
- English
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