Numéro |
J. Phys. IV France
Volume 112, October 2003
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Page(s) | 151 - 157 | |
DOI | https://doi.org/10.1051/jp4:2003854 |
J. Phys. IV France 112 (2003) 151
DOI: 10.1051/jp4:2003854
Growth kinetics of an athermal martensitic transformation by time-resolved optical diffraction from a Ni 63AI 37 (001) surface
M. Aspelmeyer, U. Klemradt, L.T. Wood and S.C. MossPhysics Department, University of Houston, 4800 Calhoun Rd., Houston, TX 77204-5005, U.S.A.
Abstract
The vertical and lateral growth process of single martensitic bands on the (001) surface of a Ni
63Al
37 single crystal was investigated using time-resolved diffraction of He-Ne laser light. Our extended kinephotometric setup
provided spatial information through an analysis of the Fraunhofer pattern created by diffraction from the surface relief,
while temporal resolution was achieved with a fast-response photodiode. On continuous cooling through the martensitic phase
transition at a rate of 10 K/min, discontinuous changes in the diffraction pattern occurred on time scales ranging from 100
microseconds up to some tens of milliseconds. Each change in the pattern corresponded to a burst-like upheaval of the relief
by a few hundred nanometers. The bands were fully developed within 150-250 ms and reached final heights of about 1.5
m.
© EDP Sciences 2003