356, 7075, 2014, 6061, 7178, 6070 Alloys

Alloy name: 356, 7075, 2014, 6061, 7178, 6070
Diagram No.: 694
Type of diagram: TTT
Chemical composition in weight %:
356 alloy: 6.5-7.5% Si, max. 0.6% Fe, max. 0.25% Cu, 0.2-0.45% Mg, max. 0.25% Ti, max. 0.35% Zn, max. 0.35% Mn, balance is Al
7075 alloy: max. 0.40% Si, max. 0.50% Fe, 1.2-2.0% Cu, max. 0.30% Mn, 2.1-2.9% Mg, 0.18-0.28% Cr, 5.1-6.1% Zn, max. 0.20% Ti, balance is Al
6061 alloy: 0.40-0.8% Si, max. 0.7% Fe, 0.15-0.40% Cu, max. 0.15% Mn, 0.8-1.2% Mg, 0.04-0.35% Cr, max. 0.25% Zn, max. 0.15% Ti, balance is Al
7178 alloy: 0.18-0.35% Cr, 1.6-2.4% Cu, max. 0.5% Fe, 2.4-3.1% Mg, max. 0.3% Mn, max. 0.4% Si, max. 0.2% Ti, 6.3-7.3% Zn, balance is Al
6070 alloy: 1.0-1.7% Si, 0.5-1.2% Mg, 0.4-1.0% Mn, 0.15-0.4% Cu, max. 0.5% Fe, max. 0.25% Zn, max. 0.15% Ti, max. 0.1% Cr, balance is Al
Alloy group: Aluminium-based alloys
Note: Figure compares the observed quench sensitivity of casting alloy 356 (Zhang & Zheng, 1996) with its CCT diagram. Four cooling rates from solution temperature were used, 220, 110, 20 and 0.5 C/s. The calculated CCT diagram clearly supports the hardness evolution plot in the following ways: - There is little precipitation when cooling rate is above 100 C/s. This is in accord with the hardness evolution plot which shows that ageing is not sensitive to cooling rate when it is over 100 C/s.
Reference: Not shown in this demo version.

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