Thermal stability of amorphous phases in vapour-deposited binary alloy thin films of palladium with vanadium, niobium and tantalum

Binary alloys of the systems V--Pd, Nb--Pd and Ta--Pd were vapour deposited and investigated by transmission electron microscopy. The atomic fraction, x, was varied in steps of 0.1 from one pure element to the other. The range over which an amorphous phase is observed is found to increase in width g...

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Bibliographic Details
Published in:Journal of materials science 1989-05, Vol.24 (5), p.1895-1900
Main Authors: VAN DER KOLK, G. J, MINEMURA, T, VAN DEN BROEK, J. J
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Specific materials
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Summary:Binary alloys of the systems V--Pd, Nb--Pd and Ta--Pd were vapour deposited and investigated by transmission electron microscopy. The atomic fraction, x, was varied in steps of 0.1 from one pure element to the other. The range over which an amorphous phase is observed is found to increase in width going from 3d to 5d alloying element in Pd: the compositions where amorphous phases are found are V sub 1--x Pd sub x (x = 0.5), Nb sub 1--x Pd sub x (x = 0.4-0.6) and Ta sub 1--x Pd sub x (x = 0.2-0.6). The composition range over which a crystalline phase is found correlates well with the single-phase solid solution region close to the melting temperature in the phase diagram. Crystallization of the V sub 0.5 Pd sub 0.5 alloy takes place at 550K. The amorphous Nb sub 1--x Pd sub x (x = 0.4, 0.5) films crystallize at 850K, whereas the amorphous Ta--Pd films crystallize between 850-1050K, depending on the composition. For Nb sub 1--x Pd sub x (x = 0.4-0.5) and Ta sub 1--x Pd sub x (x = 0.2-0.6) primary crystallization takes place into an fcc phase. The second crystallization step leads to a phase with a complex structure. The result is a two-phase system. V sub 0.5 Pd sub 0.5 and Nb sub 0.4 Pd sub 0.6 crystallize polymorphically to an fcc solid solution. The crystallization temperatures for the compositions which display primary crystallization are higher than for the compositions which crystallize by a polymorphic reaction. 23 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01105720