Table of Contents
Smart Materials Research
Volume 2012, Article ID 754657, 6 pages
http://dx.doi.org/10.1155/2012/754657
Research Article

Investigation on the Microstructure, Texture and Magnetostriction of Directionally Solidified Alloys

Defence Metallurgical Research Laboratory, Hyderabad 500058, India

Received 2 November 2011; Revised 31 January 2012; Accepted 2 March 2012

Academic Editor: H. Hosoda

Copyright © 2012 J. Arout Chelvane et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Effect of V addition on the microstructure and magnetostriction of directionally solidified Tb0.3Dy0.7Fe1.95 has been investigated. The microstructure of V added alloys (Tb0.3Dy0.7 with , 0.025, 0.05, and 0.075) indicate that Fe-50 at.% V is formed as primary phase, which subsequently undergoes spinodal decomposition. The spinodially decomposed Fe-rich phase reacts with the liquid and forms the matrix phase, (Tb,Dy)Fe2. The V-rich spinodally decomposed product, on the other hand, exists as remnant phase without undergoing any metallurgical transformation. Texture studies indicate that the grains of (Tb,Dy)Fe2 show /rotated and orientations for all compositions investigated in the directionally solidified condition. An improvement in magnetostriction has been noticed for small addition of V and with further addition the magnetostrictive property decreases. The formation of additional phases containing vanadium is attributed to be the reason when V is added in higher concentration levels.