PREMONITORY MARTENSITIC SURFACE RELIEF VIA NOVEL X-RAY DIFFUSE AND LASER LIGHT REFLECTIVITY FROM THE (001)-SURFACE OF A NI63AL37 SINGLE CRYSTAL

U. KLEMRADT *, M. ASPELMEYER *, ***,  H. ABE *, L. T. WOOD *, S. C. Moss *, E. DIMASI **, J. PEISL ***

* Department of Physics, University of Houston, Houston, TX 77204-5506, USA
** Brookhaven National Laboratory, Phys. Dept., Upton, NY 11973-5000, USA
*** Univ. Munchen, Sektion Physik, Geschw. -Scholl-Pl. 1, D-80539 Munchen, Germany

Mat. Res. Soc. Symp. Proc. Vol. 580, 293 (2000).

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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