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The effect of Sc addition in cast Al-Zn-Mg alloys with precipitation strengthening was studied different ageing conditions. Alloy (1–4) systems, the ageing at 140°C for 16h shows the moderate hardness value as compared to the solution treated samples. Further, the ageing at 120°C the high hardness (360 HV) values for the Alloy-1system and the same was estimated (320HV) for the Alloy-1 for the 180°C...
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