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On the Formation of Rapidly Quenched Ti-Pd and Pd-Si Alloys: A Comparison with Mechanically Alloyed Materials

Published online by Cambridge University Press:  26 February 2011

C. Politis  and
J. R. Thompson
C. Politis
Affiliation:
Kernforschungszentrum Karlsruhe, INFP, Postfach 3640, D-7500 Karlsruhe, FRG
J. R. Thompson
Affiliation:
Department of Physics, University of Tennessee, Knoxville, TN
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Abstract

We have investigated the formation of amorphous and microcrystalline alloys of Pd-Si and Ti-Pd. In order to allow comparison of the two methods, both liquid quenching (LQ) for rapid solidification and mechanical alloying (MA) techniques were employed. Characterization of the materials was obtained through X-ray diffraction and differential thermal analysis (DTA).

Both the LQ and MA syntheses yielded amorphous Pd80Si20 alloys, with very similar X-ray line widths and crystallization temperaiures. However, the MA alloys contained as minority component a second phase, indexed to Pd3Si.

Quite different results were obtained for the Ti-Pd alloys. LQ splats containing 42, 66, and 80 at % Ti were not amorphous but microcrystalline, as might be expected from the very similar atomic radii of Ti and Pd. In contrast, a broad range of amorphicity, from approximately 42 to 85 at % Ti, was found in the MA synthesized materials. Overall, these results show that the two methods, LQ and MA, differ in the mechanisms of amorphization. This conclusion is further supported by additional MA and LQ experiments on ternary Ti-Pd-Cu alloys.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 91
Copyright
Copyright © Materials Research Society 1987

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