International Journal of Thermophysics

, Volume 14, Issue 3, pp 541–553 | Cite as

Time-resolved X-ray scattering studies of rapid crystallization of amorphous metals

  • S. Brauer
  • H. E. Fischer
  • J. O. Ström-Olsen
  • M. Sutton
  • G. B. Stephenson
Article
  • 50 Downloads

Abstract

Time-resolved X-ray scattering has been used to study the kinetics of crystallization of amorphous metals on time scales varying from minutes to milliseconds. Measurements have been at the National Synchrotron Light Source, using a wide-bandpass monochomator and fast linear position-sensitive detector system at the IBM/MIT beamline X-20C. With this apparatus, scattering patterns from the transforming material can be acquired with 3-ms time resolution. A fast pyrometric temperature controller has been developed to change and regulate the sample temperature with microsecond response. In a typical measurement, two synchronized position-sensitive detectors provide complementaryin situ information about the transformation. The first is used for wide-angle scattering and allows us to determine which phases are present and to what extent. Changes in lattice parameter and particle size can also be deduced. The second detector measures small-angle scattering, yielding additional information about the microstructure, such as the spacing between lammellae in eutectic systems. At relatively slow transformation rates, quantitative measurements of crystal volume fractions as small as 10−4 are possible. In many systems, as the transformation rate is increased, the crystallization mechanism changes such that new metastable crystal phases are formed en route to the equilibrium structure.

Key words

amorphous metals crystallization in situ measurements X-ray scattering 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    G. B. Stephenson, K. F. Ludwig, Jr., J. L. Jordan-Sweet, S. Brauer, F. Mainville, Y. S. Yang, and M. Sutton,Rev. Sci. Instrum. 60:1537 (1989).Google Scholar
  2. 2.
    U. Köster and U. Herold, inGlassy Metals I, H.-J. Güntherodt and H. Beck, eds. (Springer-Verlag, New York, 1981), Chap. 10.Google Scholar
  3. 3.
    S. Brauer, J. O. Ström-Olsen, M. Sutton, Y. S. Yang, A. Zaluska, GH. B. Stephenson, and U. Köster,Phys. Rev. B 45:7704 (1992).Google Scholar
  4. 4.
    S. Brauer, D. H. Ryan, J. O. Ström-Olsen, M. Sutton, and G. B. Stephenson,Rev. Sci. Instrum. 61:2214 (1990).Google Scholar
  5. 5.
    S. Brauer, H. E. Fischer, J. O. Ström-Olsen, M. Sutton, and G. B. Stephenson, inNational Sunchrotron Light Source Annual Report, S. L. Hulbert and N. M. Lazarz, eds. (1990), pp. 311.Google Scholar
  6. 6.
    J. W. Christian,Transformations in Metals and Alloys, 2nd ed., part I (Pergamon, Oxford, 1975).Google Scholar
  7. 7.
    S. Brauer, H. E. Fischer, J. O. Ström-Olsen, M. Sutton, A. Zaluska, and G. B. Stephenson, in press.Google Scholar
  8. 8.
    U. Köster, U. Schünemann, M. Blank-Bewersdroff, S. Brauer, M. Sutton, and G. B. Stephenson,Mater. Sci. Eng. A133:611 (1991).Google Scholar
  9. 9.
    B. D. Cullity,Elements of X-ray Diffraction, 2nd ed. (Addison-Wesley, New York, 1978).Google Scholar
  10. 10.
    U. Köster, U. Schünemann, G. B. Stephenson, S. Brauer, and M. Sutton,Mater. Res. Soc. Symp. Proc. 205:233 (1992).Google Scholar

Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • S. Brauer
    • 1
  • H. E. Fischer
    • 1
  • J. O. Ström-Olsen
    • 1
  • M. Sutton
    • 1
  • G. B. Stephenson
    • 2
  1. 1.Centre for the Physics of Materials and Department of PhysicsMcGill UniversityMontréalCanada
  2. 2.IBM Research DivisionT. J. Watson Research CenterYorktown HeightsUSA

Personalised recommendations