Abstract
By the method of straining and heat treatment large crystals were grown in an alloy of aluminium containing 18·6 per cent. zinc. This alloy is very near the limit of solubility of zinc in aluminium, but the microstructure showed it to be a solid solution. The most favourable extension was 1 per cent., with a load of 12·2 tons per square inch. The crystals were not so large as those obtained for pure aluminium, rarely exceeding 2 inches in length and 0·5 inch in diameter. They were frequently covered with a surface layer of smaller crystals of varying size. These were removed by machining. Small test pieces were made varying in length from 1 to 2 inches over the parallel portion and having a diameter of from 0·05 to 0·25 inch. The crystals gave excellent X-ray reflections. The structure appears to be similar to pure aluminium, but has a slightly larger lattice, viz., 4·18 Å compared with 4·06 Å for pure aluminium. Reflections from both cubic and octahedral planes were obtained. The angles calculated between each pair of planes showed that the crystals had cubic symmetry.
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18 articles.
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