Electrical Resistivity Of Alloys Research Articles

Influence of long range order on electrical resistivity in alloys

We have established the CPA expression of electrical conductivity of a one orbital tight binding band model alloy in terms of the long range order parameter. We investigate its variation with temperature from the completely ordered alloy at T = 0 K till the order-disorder transition in terms of band parameters: scattering potential and filling of the band.

How irradiation affects the electrical resistance of alloys of uranium with zirconium and niobium

How irradiation affects the electrical resistance of alloys of uranium with zirconium and niobium

Electrical Resistivity of Some Gold Alloys: A Search for Effects Due to Local Modes

If phonon-assisted electron scattering by impurities contributes appreciably to the electrical resistivity of alloys, localized modes about light impurities should lead to a resistance which increases faster than linearly at temperatures around $\frac{{\ensuremath{\theta}}_{0}}{2}$ where ${\ensuremath{\theta}}_{0}$ is the characteristic temperature of the local mode. The electrical resistivity of gold alloys containing 1.8 at.% Zn, 2.4 at.% Al and 2.6 at.% Cu was measured between 80 and 500\ifmmode^\circ\else\textdegree\fi{}K. In these cases local modes are expected. Measurements were also made of alloys with 1.0 and 1.6 at.% Pt, where local modes should be absent. Substantial deviations from Matthiessen's rule were found, but not the temperature variation expected from local modes. It is suggested that this effect is obscured by deviations from Matthiessen's rule arising from the zone structure of gold. An unexplained discrepancy was found in the resistance of the 1.6% Pt alloy. The resistivity of pure gold between 80 and 480\ifmmode^\circ\else\textdegree\fi{}K is tabulated in 20\ifmmode^\circ\else\textdegree\fi{} steps.

Size Effect in Electrical Resistivity of Alloys

Size Effect in Electrical Resistivity of Alloys

Magnetic susceptibility and electrical resistivity of Au-Mn alloys

From magnetic measurements made on Au-Mn alloys in both the states, ordered and disordered, the magnetic moment μ of the manganese atoms and the Weiss temperature Θ of the alloys have been determined. In the temperature range used (90–1020°K), the electrical resistivity of the alloys has also been determined. The Θ values of the alloys are found to vary regularly with composition, being positive at low and negative at high manganese concentrations. Resistivity/concention curves have been obtained in three different states of the alloys, the atomic as well as the magnetic order being considered. The magnetic and the electrical measurements show a marked dependence of the magnetic transformation points on the degree of atomic order of a given alloy, the Curie and the Néel points being displaced toward lower temperatures with decreasing atomic ordering of the alloy.

The effect of cold-work on the electrical resistivity of alloys and the law of recovery

The effect of cold-work on the electrical resistivity of alloys and the law of recovery

The effect of cold-work on the electrical resistivity of alloys and the law of recovery

The change in resistivity due to cold-work has been determined for a number of binary alloy series having copper, silver or gold as basic metal. The effects observed are very different in the different alloy systems. A change as large as 42% of the total resistivity is found in one case. Alloys from the systems gold-chromium and gold-iron show a decrease of resistivity when cold-worked. In addition to the binary series, some alloys containing three or four components have also been investigated, and on the basis of the results obtained the question of the influence of the different solutes upon the change of resistivity is discussed. Results are given regarding the recovery of the resistivity changes as a function of time for different annealing temperatures. The resistivity change Δg as a function of temperature T and time τ is found to obey the law Δq = cτnexp (― nE/RT), where n is a number of the order 0.1–0.4 and E is the activation energy oi the process; R is the gas constant, and c a quantity of proportionality. Alloys belonging to the following binary systems have been investigated: Cu-Al, Cu-Si, Ag-Al, Ag-Mn, Ag-Sn, Au-Al, Au-Cr, Au-Mn, Au-Fe and Au-Sn, and the following multi-component systems: Au-Mn-Cr, Au-Mn-Cr-Fe and Au-Al-Cr.

Atomic Distribution in Binary Solid Solutions IV. The Influence of the Short-Range Order on the Electrical Resistivity of Alloys

The temperature dependence of the additional resistivity of binary alloys due to the presence of the short-range order is calculated by means of the pair distribution functions of atoms over crystal lattices, whose analytical expressions are given in the previous parts of this series. The present method used in deriving the expression for the resistivity in alloys is almost similar to the one which has already been developed by Nordheim, who has, however, ignored contribution of the short-range order to the resistance of alloys, and therefore obtained the additional resistivity independent of the temperature. The actual calculation is performed only for simple cubic alloys to avoid computational difficulties. According to the result of calculation, the decrease in the resistivity due to the short-range order becomes appreciable at temperatures immediately above the order-disorder transition point, and, indeed, this contribution decreases the additional resistivity by about 20% compared with the one obtain...

Theory of influence of Order-Disorder trasformations on the electrical resistivity in Alloys

Theory of influence of Order-Disorder trasformations on the electrical resistivity in Alloys

The Electrical Resistance of Alloys Under Pressure

The average pressure coefficients to 12000 kg/${\mathrm{cm}}^{2}$ of electrical resistance for three series of alloys: lithium-tin, bismuth-tin, and calcium-lead, and for one calcium-magnesium alloy of 10 A% magnesium are given in tabular form. The variation with concentration of the pressure coefficient, the temperature coefficient, and the relative change of the temperature coefficient with pressure for these three series is comparable with the variation of the structure of the alloys as given by the equilibrium diagram. The conductivity and the pressure coefficient of a dilute solid solution of bismuth in tin are the same as those of pure tin under pressure. As hydrostatic pressure and impurities have the same effect on the pressure coefficient, electric conduction probably depends on geometrical properties of the conductor.

The Electrical Resistance of Alloys under Pressure

The average pressure coefficients to 12000 kg/${\mathrm{cm}}^{2}$ of electrical resistance for three series of alloys: lithium-tin, bismuth-tin, and calcium-lead, and for one calcium-magnesium alloy of 10 A% magnesium are given in tabular form. The variation with concentration of the pressure coefficient, the temperature coefficient, and the relative change of the temperature coefficient with pressure for these three series is comparable with the variation of the structure of the alloys as given by the equilibrium diagram. The conductivity and the pressure coefficient of a dilute solid solution of bismuth in tin are the same as those of pure tin under pressure. As hydrostatic pressure and impurities have the same effect on the pressure coefficient, electric conduction probably depends on geometrical properties of the conductor.

LXX. Electrical resistance of alloys

LXX. <i>Electrical resistance of alloys</i>

Electrical Resistance of Alloys

Electrical Resistance of Alloys

The Electrical Resistance and Micro-Structure of Alloys

IN a note in NATURE for June 18, 1896, on “The Electrical Resistance of Alloys,” Lord Rayleigh suggested that the entirely different behaviour of pure metals and of alloys with respect to the resistance which they offer to the passage through them of an electrical current, might be partly due to thermoelectric effects.

The Electrical Resistance of Alloys

THE recent researches of Profs. Dewar and Fleming upon the electrical resistance of metals at low temperatures have brought into strong relief the difference between the behaviour of pure metals and of alloys. In the former case the resistance shows every sign of tending to disappear altogether as the absolute zero of temperature is approached, but in the case of alloys this condition of things is widely departed from, even when the admixture consists only of a slight impurity.

The Electrical Resistance of Alloys

IN reference to Lord Rayleigh's very interesting note in your issue of June 18, we have, for several months, had preliminary experiments in progress, with the object of educing practical proof of the effects of thermo-electric currents upon the conductivity of alloys; but, owing to the stress of routine work in our respective departments, the research was not sufficiently advanced for publication. We had hoped, however, to be able to read a short note immediately after the long vacation.