Low temperature superplasticity in a TiAl alloy with a metastable microstructure

Journal Article · Mon Sep 15 00:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00163-2· OSTI ID:540976

Nieh, T G; Wang, J N; Hsiung, L M; Wadsworth, J ^[1]; Sikka, V ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Lockheed Martin Energy Systems, Oak Ridge, TN (United States)

The titanium aluminides TiAl ({gamma}) and Ti{sub 3}Al ({alpha}{sub 2}) have considerable potential for using in advanced structures because of their attractive elevated temperature strength and low density. Both intermetallic compounds, however, normally have low ductility at room temperature, which thus far has limited their application. Therefore, methods to improve their ductility, while retaining their strength, are major challenges. In the present paper, the authors demonstrate the occurrence of superplasticity in a technological TiAl alloy (Ti-47Al-2Cr-2Nb) with a metastable microstructure at relatively low temperatures ({approximately}750--800 C) in air.

• OSTI ID: 540976
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
GRAIN SIZE
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NIOBIUM ALLOYS
PLASTICITY
STRAIN RATE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TENSILE PROPERTIES
TITANIUM ALLOYS