An experimental study on the aging of aluminium alloy by means of specific volume analysis

This paper deals with the experimental study on the aging of eight sorts of Al-alloy, e. g. 2S, 3S, 52S, 75S, Al-Cu-Sn alloy and so on, by means of specific volume analysis. The specimen of the standard dimension 10×10×20mm, is finished with a 04 emery paper as in the case of preparing the specimen for microscopy, polished with chromium oxide, and then its specific volume (significant figures: five figures) is measured by means of a precision chemical balance. After being kept in 500°C for 30 minutes, the specimens are quenched in water and temper aged for a long time at the prescribed temperature (seven degrees of 20, 80, 120, 150, 180, 200 and 220°C tempering). Then the changes of specific volume are pursued. Furthermore, some interesting results in the change of specific volume were obtained when the quenched specimens were aged in rising temperature.We add that this research owes its expence to the Grant-in-aid of the Scholarship of the Institute of Light Metal Foundation.