Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability
AbstractThe present study investigates the significance of pre-strain on the T6 aging behavior of an Al 7075 alloy for evaluating the applicability of hot stamping. In practice, the alloy was pre-strained up to 15% during solution heat treatment at 480 °C prior to quenching, and artificial aging was conducted at 120 °C. The peak aging time and precipitation behavior were compared with the alloy with pre-straining at room temperature after quenching but immediately before the artificial aging. The results showed that increasing amounts of pre-strain tend to reduce the aging time up to 50% for achieving peak hardness, which is consistent with the alloy at the T6 condition. There is a limitation for the maximum attainable amount of pre-strain of 10% for the homogeneous distribution of strain when the alloy is strained at room temperature (RT) due to the low formability. The pre-strained alloy as hot stamping exhibited lowering of the peak reaction temperatures for dissolution and formation of Guinier–Preston (GP)-Zones and precipitated with increasing amounts of pre-strain towards 15% through the differential scanning calorimetry analysis, thereby confirming the shortening of the peak aging time. The present study confirms the excellent potential of the hot-stamping process to extend the capability of an Al 7075 alloy. View Full-Text
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Jung, S.-H.; Lee, J.; Kawasaki, M. Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability. Metals 2018, 8, 137.
Jung S-H, Lee J, Kawasaki M. Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability. Metals. 2018; 8(2):137.Chicago/Turabian Style
Jung, Seon-Ho; Lee, Jongsup; Kawasaki, Megumi. 2018. "Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability." Metals 8, no. 2: 137.
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