Microstructure and texture evolution during beta extrusion of boron modified Ti-6A1-4V alloy

Roy, Shibayan and Suwas, Satyam and Tamirisakandala, S. and Srinivasan, R. and Miracle, D. B. (2012) Microstructure and texture evolution during beta extrusion of boron modified Ti-6A1-4V alloy. In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 540 . pp. 152-163.

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Abstract

Boron addition to conventional titanium alloys below the eutectic limit refines the cast microstructure and improves mechanical properties. The present work explores the influence of hypoeutectic boron addition on the microstructure and texture evolution in Ti-6Al-4V alloy under beta extrusion. The beta extruded microstructure of Ti-6Al-4V is characterized by shear bands parallel to the extrusion direction. In contrast, the extruded Ti-6Al-4V-0.1B alloy shows a regular beta worked microstructure consisting of fine prior beta grains and acicular alpha-lamellae with no signs of the microstructural instability. Crystallographic texture after extrusion was almost identical for the two alloys indicating the similarity in their transformation behavior, which is attributed to complete dynamic recrystallization during beta processing. Microstructural features as well as crystallographic texture indicate dominant grain boundary related deformation processes for the boron modified alloy that leads to homogeneous deformation without instability formation. The absence of shear bands has significant technological importance as far as the secondary processing of boron added alloys in (alpha + beta)-phase field are concerned. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Publisher:	Elsevier Science
Additional Information:	Copyright for this article belongs to Elsevier
Keywords:	Titanium alloy;EBSD;Mechanical characterization;Orientation relationship;Phase transformation
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 Aug 2012 07:12
Last Modified:	17 Aug 2012 07:12
URI:	http://eprints.iisc.ac.in/id/eprint/44481

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