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Regensburg 2004 – wissenschaftliches Programm

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M: Metallphysik

M 18: Postersitzung

M 18.11: Poster

Dienstag, 9. März 2004, 14:30–16:30, Saal C

Resistometric investigations of "order-order" kinetics in intermetallics with varying superstructure stability — •Ewa Partyka and Rafal Kozubski — M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland

Investigations of long - range ordering kinetics in ternary intermetallic systems of superstructure L12 were carried out. Two groups of compounds: Ni75Al25−xFex and Pt75Co25−xFex , showing opposite relationships between the stability of L12 superstructure and concentration of Fe, were examined by means of isochronal residual resistivity.

The effect has been analyzed within the Schulze- Lücke formalism [1] enabled separate estimation for vacancy formation EF and migration EM energies being components of the overall activation energy EA for ordering kinetics. It was found out that in both systems an increase of activation energy EA accompanying an increase of L12 superstructure stability is due the increasing tendency of the vacancy formation energy EF, the activation energy for vacancy migration EM shows either week decrease with x (Pt75Co25−xFex) or no Fe-concentration dependence (Ni75Al25−xFex).

References:
Schulze A, Lücke K. Acta Metall 1972;20:529.

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