Deformation mechanisms during superplastic testing of Ti-6Al-4V-0.1B alloy

Roy, Shibayan and Suwas, Satyam (2013) Deformation mechanisms during superplastic testing of Ti-6Al-4V-0.1B alloy. In: Materials Science and Engineering: A, 574 . pp. 205-217.

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Abstract

Superplastic tensile tests on warm rolled and optimally annealed boron modified alloy Ti-6Al-4V-0.1B at a temperature of 850 degrees C and initial strain rate of 3 x 10(-4) s(-1) results in a higher elongation (similar to 500%) compared to the base alloy Ti-6Al-4V (similar to 400%). The improvement in superplasticity has been attributed to enhanced contribution from interfacial boundary sliding to the overall deformation for the boron modified alloy. The boundary sliding was facilitated by the starting microstructure which predominantly contains small equiaxed primary a grains with narrow size distribution. Dynamic processes such as coarsening and globularization of primary a phase occur under the test condition but do not significantly contribute to the observed difference in superplasticity between the two alloys. In spite of cavitation takes place around the TiB particles during deformation, they do not cause macroscopic cracking and early fracture by virtue of the cavities being extremely localized. Localized cavitation is found to correlate with increased material transfer due to faster diffusion.

Item Type:	Journal Article
Publication:	Materials Science and Engineering: A
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Ti-6Al-4V-0.1B Alloy; Superplasticity; Microstructure; Texture; Boundary Sliding; Cavitation
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	11 Jul 2013 05:46
Last Modified:	11 Jul 2013 05:46
URI:	http://eprints.iisc.ac.in/id/eprint/46807

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