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Transformation Superplasticity of Cast Titanium and Ti-6Al-4V 总被引:1,自引:0,他引:1
Qizhen Li Edward Y. Chen Douglas R. Bice David C. Dunand 《Metallurgical and Materials Transactions A》2007,38(1):44-53
Samples of unalloyed titanium and Ti-6Al-4V with a cast, coarse-grain structure were subjected to simultaneous mechanical
loading and thermal cycling about their transformation range to assess their capability for transformation superplasticity.
Under uniaxial tensile loading, high elongations to failure (511 pct for titanium, and 265 pct for Ti-6Al-4V) and an average
strain-rate sensitivity exponent of unity are observed. Samples previously deformed superplastically to a strain of 100 pct
show no significant degradation in room-temperature mechanical properties as compared to the undeformed state. Biaxial dome
bulging tests confirm that transformation superplasticity is activated under thermal cycling and faster than creep deformation.
The cast, coarse-grained titanium and Ti-6Al-4V have similar transformation-superplasticity characteristics as wrought or
powder-metallurgy materials with finer grains. This may enable superplastic forming of titanium objects directly after the
casting step, thus bypassing the complicated and costly thermomechanical processing steps needed to achieve fine-grain superplasticity.
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David C. Dunand (Professor)Email: |
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