Showing papers in "Canadian Metallurgical Quarterly in 1972"

TL;DR: In this paper, a series of zirconium-tin alloys containing 0.7, 3.0 and 5.0% Sn were tested at different temperatures and strain rates.

TL;DR: In this article, sintered discs of synthetic enargite (Cu3AsS4) were dissolved slowly in acidified ferric sulphate solutions, yielding both elemental and sulphate sulphur, together with soluble copper and arsenic.

TL;DR: The deformation and fracture of Zircaloy-4 and pure zirconium sheets having strong (0002) textures were studied under plane-strain compression at temperatures from 20° to 800°C as discussed by the authors.

TL;DR: In this article, the authors present a consistent mechanistic picture of the silicon-induced reactivity and grey-coating phenomena in hot-dip galvanizing, using electron microprobe and scanning electron microscope analyses and a critical reconsideration of existing knowledge.

TL;DR: In this paper, the formation of a by a classical martensitic reaction and as a diffusion-controlled promonotectoid constituent is discussed in Zr alloys containing 10 to 50 % niobium.

TL;DR: In this paper, two techniques which can improve this situation are reviewed: the first technique uses the precision for individual calculated weight splits to obtain minimum variance estimates of stream weights, and the second uses a least squares-data adjustment computer program for calculating the process stream weights which minimizes adjustments necessary in chemical and physical analyses and flow measurements to obtain a completely consistent set of adjusted data.

TL;DR: In this article, the authors derived the anisotropic factors which apply to creep deformation at relatively low stresses, temperatures of 260° to 300°C and fast neutron flux from 0.6 × 1013 to 3.5× 1013 n/cm2s (> 1 MeV).

TL;DR: In this paper, the texture and microstructure of Zr-25 wt % Nb extruded tubes have been investigated and the major factor that determines the texture is the way the metal flows, which is controlled by the die shape, the extrusion ratio and the lubricant.

TL;DR: In this article, tensile tests at 300°C and structural examination have been carried out on specimens machined from annealed and cold-worked Zircaloy-4 fuel sheathing which had been neutron irradiated at 290°C.

TL;DR: In this paper, the effects of various alloying elements and strengthening methods in zirconium alloys have been assessed and it has been shown that alloys with adequate strengtl1 for use as pressure tube material at temperatures above 400°C can be developed.

TL;DR: A critical appraisal has been made of methods that have been proposed for the hydro metallurgical treatment of chalcopyrite concentrates as mentioned in this paper, including selective sulphation and nonoxidizing treatments in which the ratios of copper, iron and sulphur are changed.

TL;DR: In this paper, a relation between texture and the mechanical anisotropy of zirconium is developed, and rules are suggested for softening and hardening caused by texture change.

TL;DR: Oxygen galvanic cells developed by a number of investigators for use at steelmaking temperatures are discussed in this article, where reaction equilibria for deoxidation by silicon, manganese and other deoxidizers of interest to steelmaking are given.

TL;DR: Zirconium-based alloys with small additions of tin, molybdenum, niobium and aluminum are being developed as candidate materials for high-strength pressure tubes in advanced CANDU reactors as mentioned in this paper.

TL;DR: In this article, the orientation and the effect on tensile properties of hydrides precipitated in heat-treated Zr-2.5 wt% Nb tubing during the corrosion hydriding of internally pressurized samples were investigated.

TL;DR: In this paper, the influence of grain size on the deformation behavior of a-zirconium in the temperature range 77° − 443°K has been investigated, and the flow stress variation with grain size follows the Hall-Petch equation σ = σi + K d−1/2.

TL;DR: The use of oxygen or air as a reference electrode in an electrochemical cell incorporating the solidoxide electrolyte ZrO2-YO1.5 and a gaseous electrode of controlled oxygen pressure has been investigated in this paper.

TL;DR: When pyrrhotite is leached under nonoxidizing conditions in warm aqueous solutions containing HCl, both hydrogen sulphide and elemental sulphur are formed as mentioned in this paper.

TL;DR: A survey of information in the literature regarding the total fluoride consumption per ton of aluminum produced in many plants, and the amount of fluorides retrieved from the anode gas is given in this article.

TL;DR: In this article, the authors investigated the mechanism of activation of sphalerite under different conditions of activation and flotation and found that the mechanism was very dependent on the pH value.

TL;DR: In this article, the yield loci of four batches of Zircaloy-4 canning tubes with different textures were measured at room temperature for quadrants I and IV (axial tensile or compressive stresses in combination with internal pressure).

TL;DR: In this paper, an experimental study has been made of the equilibrium between titanium and oxygen in liquid iron at 1625° and 1700°C, where the gas mixture was bubbled through the melt to give good gas-metal contact and avoid thermal diffusion effects.

TL;DR: Internal friction studies on dilute zirconium alloys containing the interstitial impurities oxygen and nitrogen have indicated that the internal friction is caused by an interaction of substitutional and interstitial atoms as mentioned in this paper.

TL;DR: In this paper, the effects of thermal and stress cycles on the orientation of hydride, simulating reactor operation, were investigated, and the effect of stress was not significant up to 1...

TL;DR: A review of the most promising hydrometallurgical methods for the recovery of pyritic ores from artificial pyrrhotite can be found in this article, where an experimental study of some of the more promising ones is reported.

TL;DR: The evolution of methods used for deoxidation of anode topper at the Noranda smelter is summarized in this paper, where the process range from birch poles and reverberatory furnace to present day natural gas and rotary furnace.

TL;DR: In this article, the current efficiency in a laboratory aluminum electrolytic cell was determined by gas analysis as a function of the alumina content in the cryolite melt, while NaCl had the opposite effect.

TL;DR: The effect of vanadium on the activity of oxygen in liquid iron has been determined by a new method based on levitation melting with water-vapour/hydrogen mixtures to control the oxygen potential of the gas phase as mentioned in this paper.

TL;DR: The strain-rate dependent hardening behavior of commercial grade purity zirconium and its alloy containing 2.5 wt % niobium was investigated by employing a stress relaxation testing method at temperatures from room temperature to 400 C as discussed by the authors.

TL;DR: Fracture studies were made on two batches of SGHWR pressure tubing, one of which had a normal grain size and structure, while the other was coarse grained due to overheating during heat treatment.