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Non-equilibrium processes in martensitic phase transformations by X-ray photon correlation spectroscopy

Published online by Cambridge University Press:  22 June 2015

Michael Widera  and
Uwe Klemradt
Michael Widera
Affiliation:
2nd Institute of Physics and JARA-FIT, RWTH Aachen University, D-52056 Aachen, Germany.
Uwe Klemradt
Affiliation:
2nd Institute of Physics and JARA-FIT, RWTH Aachen University, D-52056 Aachen, Germany.

Abstract

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Through undulator sources at 3rd generation synchrotrons, highly coherent X-rays with sufficient flux are nowadays routinely available, which allow carrying over photon correlation spectroscopy (PCS) from visible light to the X-ray regime. X-ray photon correlation spectroscopy (XPCS) is based on the auto-correlation of X-ray speckle patterns during the temporal evolution of a material and provides access both to equilibrium and non-equilibrium properties of materials at the Angstrom scale. Owing to technical limitations (detector readout), XPCS has typically been used for the detection of slow dynamics on the scale of seconds. The variety of scattering geometries employed in conventional X-ray analysis can be combined with XPCS. In this work, we report on bulk diffraction (XRD) used to study the prototypical shape memory alloy Ni63Al37 undergoing a structural, diffusionless (martensitic) transformation. Two-time correlation functions reveal non-equilibrium dynamics superimposed with microstructural avalanches.

Keywords

x-ray diffraction (XRD)nucleation & growthphase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1754: Symposium OO/PP/QQ/TT – State-of-the-Art Developments in Materials Characterization , 2015 , pp. 141 - 146
Copyright
Copyright © Materials Research Society 2015 

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