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Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from The (001)-Surface of A Ni63Al37Single Crystal

  • U. Klemradt (a1), M. Aspelmeyer (a1) (a2), H. Abe (a1), L.T. Wood (a1), S.C. Moss (a1), E. Dimasi (a3) and J. Peisl (a2)...
Abstract
Abstract

Both x-ray diffuse reflectivity and laser light scattering have been used to investigate the temperature-dependent surface behavior of a Ni63Al37 single crystal on different length scales. In-situ experiments were performed above the conventional martensitic start temperature Ms to search for premartensitic phenomena. X-ray experiments showed the presence of a surface precursor with second-order (continuous) character several 10 K above Ms. This premonitory effect corresponds to a height-height-correlation function which changes on the nanometer scale as the martensitic transformation is approached. At the martensitic transformation, the surface morphology changed from nanoscopic roughness to macroscopic relief within a temperature interval of less than 1 K via intermediate stages. Laser light scattering was employed to study time-dependent aspects of the athermal martensitic transformation above Ms. The occurrence of a martensitic transformation on isothermal holding after a certain incubation period was observed in Ni-Al for the first time. The measured incubation times increased by four orders of magnitude within a temperature interval of 0.5 K.

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Corresponding author
Corresponding author. Present address: Univ. Miinchen, Sektion Physik, Geschw.-Scholl-P1. I, D-80539 Mhinchen, Germany. E-mail: uwe.klemradt@physik.uni-muenchen.de
References
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MRS Online Proceedings Library (OPL)
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  • EISSN: 1946-4274
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