Irregular growth of AlSb in solid aluminum-solid antimony diffusion couples |
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Authors: | John E Lyttle Peter V Dembowski Louis S Castleman |
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Affiliation: | (1) Microcast Division, Howmet Corp., Dover, N.J.;(2) U. S. Army, Watervliet Arsenal, Watervliet, N.J.;(3) Department of Physical and Engineering Metallurgy, Polytechnic Institute of Brooklyn, USA |
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Abstract: | An investigation was made of the growth of the intermediate phase aluminum antimonide (AlSb) in solid aluminum-solid antimony
diffusion couples, AlSb being the only intermediate phase present in the equilibrum phase diagram. Most diffusion couples
were assembled from polycrystalline aluminum and antimony, but a few were made from single crystals; the diffusion couple
surfaces were prepared in a variety of ways and the couples were isothermally annealed at temperatures between 450° and 615°C.
It was found in all cases that AlSb nucleates at the original interface and after sufficient time coalesces into a highly
irregular layer, irrespective of the details of the surface treatment. In several cases in which limited nucleation of AlSb
took place, the morphology of the crystals was such as to suggest that the observed anisotropic growth was related to the
zinc-blende crystal structure of the AlSb.
Formerly Graduate Student, Department of Physical and Engineering Metallurgy, Polytechnic Institute of Brooklyn, Brooklyn,
N. Y.
Formerly Graduate Student, Department of Physical and Engineering Metallurgy, Polytechnic Institute of Brooklyn. |
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