Abstract

As the survey on the change of spesific volume makes it possible to analyse the change which takes place inside the material, this method was tried to examine the aging phenomenon of aluminium alloys, as a method in industrial operation. As the resultof this study, it was found that this method can be successfully used for this purpose.10 sorts of specimens such as 1S, 2S, 3S, 17S etc., on which the change in specific volume had already been known by previous study, were applied for this experiment, where in the tempered aging was made for them under the increasing temperature from 20°C to 400°C. The change in vickers hardness and knoop hardness under different temperature were measured and the relation between change in hardness and specific volume analysis was studied.As the result of the experiment, the specific volume analysis was quit reliable as a method for examining the aging in aluminium alloys. The result was also carefully studied from the viewpoint of the knoop ratio.

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