Abstract
LONDON. Institute of Metals, Sept. 15* (Annual Autumn Meeting, Zurich).—W. E. Alkins: Experiments in wiredrawing. (2) Notes on the relation between reduction of area by cold-drawing and tensile strength of H.-C. copper. Annealed copper rod 0.435 in. diameter was drawn through straight-sided tapering dies at single drafts of slowly increasing amount. The resulting ‘primary’ tensile strength reduction of area curve consists of an approximately rectilinear portion up to about 15 per cent reduction and of a smooth curve concave to the reduction axis from 15 per cent upwards. Below 15 per cent, results are consistent with the view that drawing takes place by simple elongation under tensile stress; above 15 per cent the curve has the form of a rectangular hyperbola, and one asymptote appears to lie suggestively near the limiting tensile strength to which copper can be cold-drawn.—Clement Blazey: Brittleness in copper. The experiments described are a continuation of those described in two other papers already published under the title of “Brittleness in Arsenical-Copper”. It has been found that the brittleness is not restricted to arsenical-copper, but may be produced in copper free from arsenic.—Edward J. Daniels: The attack on mild steel in hot-galvanising. Experiments have been carried out in the laboratory to determine the rates of attack on mild steel strip when immersed in different brands of zinc at various temperatures between 432° C. and 540° C. The influence of the addition of small percentages of aluminium, antimony, and tin has been investigated, and the action of alloys of zinc and cadmium has also been studied.—J. S. Dunn: The oxidation of some copper alloys. The zinc-copper alloys fall, so far as their behaviour under oxidation is concerned, into two classes, fairly sharply separated. Those with copper contents below about 80 per cent all oxidise at essentially the same rate, and all give rise to an oxide which is almost pure zinc oxide.
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Societies and Academies. Nature 128, 594–595 (1931). https://doi.org/10.1038/128594b0
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DOI: https://doi.org/10.1038/128594b0