Low-temperature superplasticity of submicrocrystalline Ti-48Al-2Nb-2Cr alloy produced by multiple forging

Journal Article · Fri Dec 18 00:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00419-9· OSTI ID:328254

Imayev, V M; Salishchev, G A; Shagiev, M R; Kuznetsov, A V; Imayev, R M ^[1]; Senkov, O N; Froes, F H ^[2]

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1. Inst. for Metals Superplasticity Problems, Ufa (Russian Federation)
2. Univ. of Idaho, Moscow, ID (United States). Inst. for Materials and Advanced Processes

Gamma titanium aluminides are attractive for elevated temperature applications because of their high specific strength, modulus retention, good oxidation and creep resistance. However they are inherently brittle at temperatures below 600 C due to their strong covalent interatomic bonding, which makes fabrication difficult and has restricted commercial applications. In this research work the authors have studied superplastic (SP) forming of a gamma alloy. Grain refinement is the most common method of decreasing the temperature at which superplasticity is observed, while the second approach is applicable only to gamma alloys containing less than 47 at.% Al. In the present work, a low-temperature superplasticity of a gamma TiAl-based alloy was achieved by producing a submicrocrystalline structure via multistep forging. Mechanical behavior and microstructural evolution of the submicrocrystalline gamma titanium aluminide were studied and possible mechanisms of the low-temperature superplasticity were discussed.

• OSTI ID: 328254
• Journal Information: Scripta Materialia, Vol. 40, Issue 2; Other Information: PBD: 18 Dec 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PLASTICITY
FORGING
TITANIUM ALLOYS
ALUMINIUM ALLOYS
NIOBIUM ALLOYS
CHROMIUM ALLOYS
INTERMETALLIC COMPOUNDS
GRAIN REFINEMENT
TEMPERATURE DEPENDENCE