A356 Alloy

Alloy name: A356
Diagram No.: 844
Type of diagram: TTP
Chemical composition in weight %: 7% Si, 0.4% Mg, balance is Al
Alloy group: Aluminium-based alloys
Note: 99.5% TTP curves of A356 casting alloy, dash and solid indicate the TTP curves under different calculation [27].
TTP diagrams can be used to investigate continuous cooling processes. Ma et al. [27] investigated the quench sensitivity of Al-7 pct Si- 0.4 pct Mg (A356) solution heat treatment samples. They used quench factor analysis and constructed TTP curves, which has nose temperature at 425 C, as indicated in the figure. There are several factors that would affect quench sensitivity. Zhang and Zheng investigated the quench sensitivity of Al-Si-Mg alloy, they found that the heat treatment process would affect quench sensitivity, as to the fact that the underaged condition was less quench sensitive than the peak-aged condition. Chaudhury and Apelian investigated the quench sensitivity of Al-7 pct Si-Mg alloys with Mg content from 0.35-0.56 pct. They found that the alloy with the highest Mg content are the most sensitive to cooling rate, which implied highest quench sensitivity.
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