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Title: In-situ laser ultrasonic measurement of the hcp to bcc transformation in commercially pure titanium

Abstract

Using a novel in-situ laser ultrasonic technique, the evolution of longitudinal velocity was used to measure the α − β transformation during cyclic heating and cooling in commercially pure titanium. In order to quantify the transformation kinetics, it is shown that changes in texture can not be ignored. This is particularly important in the case of titanium where significant grain growth occurs in the β-phase leading to the ultrasonic wave sampling a decreasing number of grains on each thermal treatment cycle. Electron backscatter diffraction measurements made postmortem in the region where the ultrasonic pulse traveled were used to obtain an estimate of such local texture and grain size changes. An analysis technique for including the anisotropy of wave velocity depending on local texture is presented and shown to give self consistent results for the transformation kinetics. - Highlights: • Laser ultrasound and EBSD interpret the hcp/bcc phase transformation in cp-Ti. • Grain growth and texture produced variation in velocity during similar treatments. • Texture was deconvoluted from phase addition to obtain transformation kinetics.

Authors:
; ;
Publication Date:
OSTI Identifier:
22587165
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 117; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; BACKSCATTERING; BCC LATTICES; COOLING; ELECTRON DIFFRACTION; GRAIN GROWTH; GRAIN SIZE; HCP LATTICES; HEAT TREATMENTS; HEATING; LASERS; PHASE TRANSFORMATIONS; TEXTURE; TITANIUM; ULTRASONIC WAVES

Citation Formats

Shinbine, A., E-mail: alyssa.shinbine@gmail.com, Garcin, T., and Sinclair, C. In-situ laser ultrasonic measurement of the hcp to bcc transformation in commercially pure titanium. United States: N. p., 2016. Web. doi:10.1016/J.MATCHAR.2016.04.018.
Shinbine, A., E-mail: alyssa.shinbine@gmail.com, Garcin, T., & Sinclair, C. In-situ laser ultrasonic measurement of the hcp to bcc transformation in commercially pure titanium. United States. doi:10.1016/J.MATCHAR.2016.04.018.
Shinbine, A., E-mail: alyssa.shinbine@gmail.com, Garcin, T., and Sinclair, C. Fri . "In-situ laser ultrasonic measurement of the hcp to bcc transformation in commercially pure titanium". United States. doi:10.1016/J.MATCHAR.2016.04.018.
@article{osti_22587165,
title = {In-situ laser ultrasonic measurement of the hcp to bcc transformation in commercially pure titanium},
author = {Shinbine, A., E-mail: alyssa.shinbine@gmail.com and Garcin, T. and Sinclair, C.},
abstractNote = {Using a novel in-situ laser ultrasonic technique, the evolution of longitudinal velocity was used to measure the α − β transformation during cyclic heating and cooling in commercially pure titanium. In order to quantify the transformation kinetics, it is shown that changes in texture can not be ignored. This is particularly important in the case of titanium where significant grain growth occurs in the β-phase leading to the ultrasonic wave sampling a decreasing number of grains on each thermal treatment cycle. Electron backscatter diffraction measurements made postmortem in the region where the ultrasonic pulse traveled were used to obtain an estimate of such local texture and grain size changes. An analysis technique for including the anisotropy of wave velocity depending on local texture is presented and shown to give self consistent results for the transformation kinetics. - Highlights: • Laser ultrasound and EBSD interpret the hcp/bcc phase transformation in cp-Ti. • Grain growth and texture produced variation in velocity during similar treatments. • Texture was deconvoluted from phase addition to obtain transformation kinetics.},
doi = {10.1016/J.MATCHAR.2016.04.018},
journal = {Materials Characterization},
number = ,
volume = 117,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2016},
month = {Fri Jul 15 00:00:00 EDT 2016}
}