ELECTRON-MICROSCOPE INVESTIGATION OF THE SYSTEM OF ALLOYS AL-ZN-MG,
INSTITUTE OF MODERN LANGUAGES INC WASHINGTON D C
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Two methods can be recommended for decreasing the tendency of an alloy to corrode under stress. 1 Decrease of the concentration of vacancies before aging by reducing the rate of cooling during hardening or by increasing the aging temperature with obligatory introduction into the alloy of the proper amount of elements Cr, Mn, Pe, Si, Ti, Zr, etc. which yield insoluble intermetallides during heating for hardening. However, this method leads also to a lowering of the strength characteristics. Regulation of the concentration of vacancies by changing the hardening temperature is not discussed here, since the choice of temperature is influenced by a number of technological factors. 2 Increase of the concentration of vacancies, and, consequently, provision for a more dispersed and uniform decomposition by means of the introduction of elements which increase the solubility of vacancies Zr, Ti, Sc, Cu, Ag. Evidently a combination of the two methods is expedient for obtaining the optimal complex of properties of the considered alloy types. Besides, one should take into consideration the indirect positive effect of admixtures of the recrystallization temperature and the increase of the length of the grain boundaries connected therewith.
- Properties of Metals and Alloys
- Fabrication Metallurgy