On the Mechanisms of Aging in Aluminium-Silver Alloys, I

概要

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The Specific Heat-Temperature curves of age-hardened samples of Aluminium-Silver alloy have been obtained by the Nagasaki-Takagi method, the results of which are in good agreement with hardness measurements of Köster and Braumann. A discrete step is observed between two clearly defined stages of aging process, the first of which is attributed to creation of the Guinier-Preston Zone ($\gamma''$ phase) and the second of which to precipitation of the $\gamma'$ phase and its transformation to the $\gamma$ phase. The phase limits of $\gamma''$ and $\gamma'$ (or $\gamma$) phases respectively are determined and shown in the phase diagram. The results are discussed and compared with the measurements of X-ray diffuse diffraction effects.
1953-09-25