Microstructural Characterization and Stress Corrosion Cracking Susceptibility of Al-Zn-Mg-Ti Alloys.
RENSSELAER POLYTECHNIC INST TROY N Y MATERIALS DIV
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The effects of adding small amounts of titanium to age-hardening Al-Zn-Mg alloys have been studied by transmission electron microscopy, mechanical atests, and stress corrosion cracking SCC tests. The zinc, magnesium, and titanium content of the alloys was varied and the effect of aging upon these alloys was examined. Multiple stages of aging were observed for several of the titanium addition alloys. The resistance to SCC of the Al-Zn-Mg ternary in an aqueous solution 3.5NaCl at room temperature was significantly improved in the titanium addition alloy with 0.12 as compared to an alloy with 0.23 Ti reported upon previously. The addition of 0.09Ti to Al-7Zn-2Mg alloy produces a finer grain boundary precipitation and no deleterious effect on the SCC property. Author
- Properties of Metals and Alloys