Title: Assessment of grain size and lattice parameters of titanium alloy through electromagnetic emission technique

Authors: Vishal S. Chauhan; Ashok Misra

Addresses: School of Engineering, Indian Institute of Technology, Mandi – 175001, Himachal Pradesh, India. ' Department of Mechanical Engineering, Birla Institute of Technology, Mesra – 835 215, Ranchi, India

Abstract: Effects of variation in grain size and lattice parameters at elevated temperatures on the electromagnetic radiation (EMR) during failure under tension of ASTM B265 Grade 2 titanium have been investigated. The EMR is observed to be anisotropic in nature. The EMR amplitude decreases with increase in grain size. The magnitude of variation depends upon the processing history of specimens. The EMR amplitude decreases exponentially with lattice parameters in titanium while the decrease in EMR frequency is polynomial in nature. The experimental results are in close agreement with the theoretical predications presented in this paper. A comparison with the results reported earlier shows that the nature of EMR responses with lattice parameters is independent of metal crystal structure. These investigations lead to a new technique for the assessment of grain size and lattice parameters in metals.

Keywords: grain size; lattice parameters; plastic deformation; crack propagation; electromagnetic radiation; EMR; titanium alloys; high temperature; failure.

DOI: 10.1504/IJMMP.2011.044367

International Journal of Microstructure and Materials Properties, 2011 Vol.6 No.6, pp.486 - 506

Available online: 14 Dec 2011 *

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