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Metals 2018, 8(2), 137; https://doi.org/10.3390/met8020137

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

1
Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
2
Metal Forming Technology R&D Group, Korea Institute of Industrial Technology, Incheon 21999, Korea
3
Department of Mechanical Engineering, Inha University, Incheon 22212, Korea
4
School of Mechanical, Industrial & Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA
*
Authors to whom correspondence should be addressed.
Received: 12 January 2018 / Revised: 10 February 2018 / Accepted: 12 February 2018 / Published: 16 February 2018
(This article belongs to the Special Issue Heat Treatment of Aluminum Alloys)
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Abstract

The 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
Keywords: Al alloy; artificial aging; hot stamping; precipitation; pre-strain Al alloy; artificial aging; hot stamping; precipitation; pre-strain
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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.

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