Validation of predicted precipitate compositions in Al-Si-Ge |
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| Authors: | B Dracup Jr" target="_blank">J W MorrisJr P E A Turchi V Radmilovic U Dahmen |
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| Affiliation: | (1) Exponent Failure Analysis, 90066 Los Angeles, CA;(2) the Department of Materials Science and Engineering, University of California, Berkeley, 94720 Berkeley, CA;(3) the Materials Science Division, Lawrence Berkeley National Laboratory, 94720 Berkeley, CA;(4) the Materials Science Department, Lawrence Livermore National Laboratory, 84551 Livermore, CA;(5) the National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, USA |
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| Abstract: | Aged alloys of Al-0.5Si-0.5Ge (at. pct) contain diamond-cubic-A4 precipitates in a dispersion that is much finer than is found
in alloys with Si or Ge alone. To help understand this aging behavior, the present work was undertaken to determine alloy
composition as a function of aging temperature. The composition was estimated theoretically using a CALPHAD approach, and
measured experimentally with energy-dispersive spectroscopy (EDS) in a high-resolution electron microscope. Theory and experiment
are in reasonable agreement. As the aging temperature rises, the precipitates become enriched in Si, changing from 50 at.
pct in the low-temperature limit to about 80 at. pct Si as the temperature approaches 433 °C, the high-temperature limit of
the precipitate field. |
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