Hareo Iwamura, Nobuo Shiota and Choei Onozaki
A microscopic study on the structure of aluminium single crystal produced by the critical strain method was carried out with the etching solution of P.Lacombe. We recognized, by inserting in hydrogen gas, the considerable change in the structure,when uniform and non-uniform deformations or the heat treatment were done.
The results of the experiment may be summarized as follows:
(a) Etch pits of pure aluminium single crystal are smaller than those of the crystal prepared from the molten metal into which the water vapour is blown.
(b) The specimen cold-worked by about 60 per cent in reduction reveals the sub-boundaries, and the sizes of the sub-boundary become larger with an increase of the volume of the occlude hydrogen gas.
(c) A weakly deformed specimen including hydrogen gas often reveals sub-boundaries by annealing for 20 hours at 620°C.
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