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- W1574656088 abstract "The role of Cu in aging phenomena in Al-Zn-Mg-Cu alloys was investigated by hardness and specific heat measurements and transmission electron microscopy. Various specimens, based on (α+T) type Al-Zn-Mg alloys, with a nearly fixed amount of 5.5at% in (Zn+Mg) and with different Cu contents were used. The specimens were solution-treated at 470°C for 2hrs, quenched into iced-water, and finally subjected to aging at various tempera tures. The results obtained were as follows:(1) As Cu content increased, the initial rate of age hardening and the maximum hardness attained at 125-150°C aging increased. The time required for hardness to reach the maximum also increased. This indicates that the quarternary alloys are superior to the ternary alloys with respect to hardness and heat resistant characteristics.(2) Specific heat measurement and observation on transmission electron microscopy showed that two sorts of precipitation processes would exist in Al-Zn-Mg-Cu alloys when Cu contents exceeded about 0.7wt%. One process was that observed in Al-Zn-Mg alloys and the other was that observed in Al-Cu-Mg alloys.(3) Clusters or precipitates, which were formed in the present quarternary alloys and corresponded to those in Al-Cu-Mg alloys, were considered to be responsible for the peculiar aging phenomena in the quarternary alloys." @default.
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- W1574656088 date "1972-01-01" @default.
- W1574656088 modified "2023-10-05" @default.
- W1574656088 title "Effects of copper addition on aging phenomena in Al-Zn-Mg alloys" @default.
- W1574656088 doi "https://doi.org/10.2464/jilm.22.11_661" @default.
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