Enhanced superplasticity for (alpha plus beta)-hot rolled Ti-6Al-4V-0.1B alloy by means of dynamic globularization

Roy, Shibayan and Suwas, Satyam (2014) Enhanced superplasticity for (alpha plus beta)-hot rolled Ti-6Al-4V-0.1B alloy by means of dynamic globularization. In: MATERIALS & DESIGN, 58 . pp. 52-64.

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Abstract

Thermo-mechanically processed Ti-6Al-4V alloy, with (0.1 wt.%) and without boron addition, has been subjected to tensile test under superplastic deformation conditions (Temperature, T = 850 degrees C and initial strain rate, (epsilon) over dot = 3 x 10(-4) s(-1)). The boron added alloy exhibited higher elongation (similar to 430%) in comparison to the base alloy without boron (similar to 365%). Superior ductility of the boron added alloy has been attributed to an enhanced alpha/beta interfacial boundary sliding. This was caused by riotous dynamic globularization leading to the abundant presence of equiaxed primary alpha grains with refined sizes and narrow distribution in the deforming microstructure. Cavities do occur around TiB particles during deformation; the cavities are, however, extremely localized and do not cause macroscopic cracking. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS & DESIGN
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copyright for this article belongs to the ELSEVIER SCI LTD, ENGLAND
Keywords:	Ti-6Al-4V alloy; Boron addition; Superplasticity; Dynamic globularization; Dynamic coarsening; Cavitation
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	27 May 2014 07:35
Last Modified:	27 May 2014 07:35
URI:	http://eprints.iisc.ac.in/id/eprint/49010

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