On the effect of structure on the electrical resistivity of some ordering solid solutions

Abstract

An analysis is made of the different contributions to the electrical resistivity of ordering solid solutions. The formalism developed is applied to the process of ordering of Cu,Au alloys. Furthermore, the effect of cold-work upon order in Cu,Au and Ni,Fe is discussed. It is experimentally found that a parameter which depends on the electron thermal scattering term of the resistivity is uniquely related to the state of local order of the structure. Its importance is pointed out as i t permits to separate the effects of order and recovery on the resistivity of these solid solutions. Experimental results and conclusions of previous works are also discussed.Une analyse est faite des diffirentes contributions it la resistivit6 Blectrique des solutions solides avec tendence a l'ordre. La formulation developpee est appliquee au processus d'ordre dans des alliages Cu,Au. E n outre, l'effet d'6crouissage sup l'ordre de cet alliage ainsi que dans Ni,Fe est expliquh. On trouve experimentdement q'un parametre dans la rBsistivit6 qui d6pend de la diffusion thermique des electrons n'est lie qu'8 l'etat d'ordre local de la structure. Son importance est indiquee parce qu'elle permet la separation des effets de l'ordre et de la recuperation sur la ritsistiviti: de ces solutions solides. Des resultats experimentaux et des conclusions des travails precedents sont aussi discutks.

Ordering and recovery processes in the Ni/Fe system near Ni3Fe

“…Here vacancy mobility increases rapidly, resulting in both vacancy annihilation at sinks and further inducement of local order. Since c~ is only influenced by ordering [15] and p0 by both order development and defect annihilation this process should affect the behaviour of o0 more, in agreement with experimental findings. According to this explanation, the isochronal anneals of the quenched alloy show constant values of c~ and P0 during this first stage (see fig.…”

“…The sources and analysis of materials, details of sample preparation and annealing treatments, as well as the techniques used for the measurement of electrical resistivity have already been described in previous publications [15,16]. In most cases, duplicate specimens were used for each annealing run.…”

“…1 and 2 show for the initially cold worked 72/28 alloy the relative variations of the residual resistivity P0 and the parameter ~ (equation 1), respectively, versus the annealing temperature for three step-annealing times. The parameter is here referred to as the standard cold-worked disordered condition [15]. Therefore, unless specially mentioned, a = 1 for maximum achieve able disorder.…”

“…The parameter a, which has been shown to be dependent only on the atomic order [15], will be used here as the main tool for analysing the isothermal behaviour of the Ni/Fe alloys.…”

“…The electrical resistivity results have been analysed by means of a procedure described in a previous publication [15] which allows the separation of the different contributions to the resistivity. It has been proved that for Ni/Fe alloys, below room temperature, the resistivity is given by: p(A, W, T) = p0(A, W) + ~(A).…”