کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
829980 | 1470347 | 2013 | 7 صفحه PDF | دانلود رایگان |
• Characteristics of GP zones formed in Al–Zn–Mg cast alloys using SAXS technique.
• GP zones formation and growth are accompanied with increase in electrical resistance.
• Direct quenching–aging process results in significant increase in electrical resistance peak.
• The electrical resistance peak of Al–Zn alloys was low compared to Mg-containing alloys.
This study aimed at investigating the structural, electrical resistivity and hardness changes of aged Al–Zn–Mg alloys. It was observed that the isothermal annealing in temperature range of 25–200 °C leads to the following precipitation sequence: Guinier–Preston zones → η′-phase → η-phase. The significant increase of electrical resistivity (ρ) of the considered alloys was associated with the stage of GP zone decomposition. The formation of the intermediate η′-phase was accompanied with a decrease of electrical resistivity and an increase of hardness. Non-continuous quenching was found to suppress the η′-phase formation; while elevated quenching rates led to the formation of uniformly distributed fine precipitates in the alloy bulk.
Journal: Materials & Design - Volume 50, September 2013, Pages 606–612