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Yielding and work hardening behaviour of titanium aluminides at different temperatures

1991; Elsevier BV; Volume: 132; Linguagem: Inglês

10.1016/0921-5093(91)90360-y

1873-4936

P. Prasad Rao, K. Tangri,

Semiconductor materials and interfaces

Yielding and work hardening behaviour of a series of TiAl alloys containing 34, 44, 48, 50 and 52 at.% aluminium were investigated through compression tests at 293, 673 and 1073 K. It was found that a coarse-grained polycrystalline single-phase γ alloy showed yield strength anomaly while two-phase α2 + γ alloys showed a marked insensitivity of yield strength to temperature in the range 293–1073 K. The two-phase alloys and the single-phase γ alloy showed multistage deformation behaviour, while the single-phase α2 alloy did not. The yield strength and the work hardening tendency of the two-phase alloys increased with increasing volume per cent of the lamellar α2 + γ constituent.