Aging Process during Creep Deformation in an Al-Mg-Si Alloy Affected by Pre-Aging Condition
Creep behavior of an Al-0.3%Mg-0.5%Si alloy affected by pre-aging condition was investigated to obtain fundamental knowledge on the thermal stability in the service temperature range for the precipitation-hardened aluminum heat-exchanger. The alloy was aged at 175 °C for 3 h (under-aged) and 24 h (peak-aged), after solution treatment, and then subjected to creep testing at temperatures of 150 °C and 200 °C. When the creep temperature was 150 °C, the under-aged (UA) specimen showed a lower creep rate than that of the peak-aged (PA) specimen. On the other hand, when the creep temperature was 200°C, both specimens showed almost the same creep rate. In other words, the UA specimen had higher creep resistance than the PA specimen at 150 °C, whereas this advantage disappeared at 200 °C. The difference was thought to originate from the precipitation during creep testing.
Knut Marthinsen, Bjørn Holmedal and Yanjun Li
M. Ando et al., "Aging Process during Creep Deformation in an Al-Mg-Si Alloy Affected by Pre-Aging Condition", Materials Science Forum, Vols. 794-796, pp. 261-266, 2014