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Excerpt from Preparation of Light Aluminum-Copper Casting Alloys Strictly speaking, the commercial No. 12 alloy is not a simple binary alloy in most foundries, because it contains appreciable amounts of impurities; increasing amounts of iron markedly affect the properties of the alloy. If the iron content is high (it often is per cent), the alloy should be regarded as a ternary aluminum-copper iron alloy. The iron content of most of the N o. 12 alloy cast to-day is 1 to per cent, because scrap high in iron is used in making up melting charges, and because much of the remelted (secondary) alu minum pig is high in iron. Unless the foundryman buys his melt ing materials on analysis and excludes materials high in impurities, the resultant castings can not be expected to approach 92: 8 aluminum copper in composition, because No. 12 pig as marketed by refiners may run high in iron. The results of chemical analyses of samples from a number of heats of No. 12 alloy on an aircraft-crankcase job cast under Government specifications are shown in Table 1. The analyses represent. Results on samples selected at various intervals during about three months' production. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Excerpt from Preparation of Light Aluminum-Copper Casting Alloys Strictly speaking, the commercial No. 12 alloy is not a simple binary alloy in most foundries, because it contains appreciable amounts of impurities; increasing amounts of iron markedly affect the properties of the alloy. If the iron content is high (it often is per cent), the alloy should be regarded as a ternary aluminum-copper iron alloy. The iron content of most of the N o. 12 alloy cast to-day is 1 to per cent, because scrap high in iron is used in making up melting charges, and because much of the remelted (secondary) alu minum pig is high in iron. Unless the foundryman buys his melt ing materials on analysis and excludes materials high in impurities, the resultant castings can not be expected to approach 92: 8 aluminum copper in composition, because No. 12 pig as marketed by refiners may run high in iron. The results of chemical analyses of samples from a number of heats of No. 12 alloy on an aircraft-crankcase job cast under Government specifications are shown in Table 1. The analyses represent. Results on samples selected at various intervals during about three months' production. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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