RBsumC. -Les anomalies de rksistivitk apr&s le traitement thermique d'alliages dont un composant au moins est un mktal de transition, ont Ct C traitkes par differents auteurs deja. L'accroissement anormal de la courbe de rksistivitk en fonction de la temperature a ktk attribuk B la formation de l'Ctat appele ct K )) des alliages.Dans le present exposk, l'alliage Ni 11,4 % at Cr a Ctk rkktudik. Les formes des courbes isochrones et isothermes mesurees sont t r b semblables a celles trouvees pour un alliage Au 15 % at Ag. C'est la raison pour laquelle l'analyse basee sur la diffusion de lacunes et la formation d'ordre a courte distance, telle que dkveloppke pour l'alliage Au-Ag, a ktk appliquke aussi aux experiences NiCr. Ici aussi les valeurs autoconsistantes trouvees pour les energies de formation et de..migration-de lacunes ainsi que l'energie d'activation d'autodiffusion sont en accord avec les valeurs dkja connues.Abstract. -Different authors have reported upon resistivity anormalities after thermal treatment of alloys with at least one component being a transition metal. The abnormal increase in the resistivity vs. temperature curve was attributed to the formation of the so-called ( c K ))-state of the alloys.In the present contribution the alloy Ni 11.4 at % Cr has been re-investigated. The shapes of the measured isochronal and isothermal curves are very similar to those found on an Au 15 at % Ag alloy. For this reason the analysis based on vacancy diffusion and short-range-order formation, as developed for the Au-Ag-alloy has been applied also to the NiCr experiments. Also here selfconsistent values for the enthalpies of formation and migration of vacancies as well as the activation enthalpy of selfdiffusion could be determined in good agreement to the values found in literature.1. Introduction. -In the early fifties, detailed investigations were made on the electrical resistivity of alloys with at least one component being a transition metal [l-51.For instance Thomas [2] reports about three anormalities in resistivity measurements in NiCr alloys :1) The resistivity vs. temperature curve is not linear, but t( S ))-shaped.2) After quenching from high temperatures the resistivity of a sample increases during an annealing treatment at lower temperature.3) In contrast to the behaviour of pure metals and many alloys the resistivity of the samples can be decreased by cold deformation.The author assumed that these anormalities were caused by the so-called <( K-state )) which should arise in these alloys at low temperatures (l). However, no detailed information has been provided as to what this state should be microscopically. Although it was assumed that diffusion should control the formation of this state, ordering phenomena were excluded because ordering was assumed to always decrease the electrical resistivity as it is found for long-range-
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