Article ID Journal Published Year Pages File Type
1571310 Materials Characterization 2012 8 Pages PDF
Abstract

Multi-step heat treatments comprise of high temperature forming (150 °C/24 h plus 190 °C for several minutes) and subsequent low temperature forming (120 °C for 24 h) is developed in creep age forming of 7075 aluminum alloy to decrease springback and exfoliation corrosion susceptibility without reduction in tensile properties. The results show that the multi-step heat treatment gives the low springback and the best combination of exfoliation corrosion resistance and tensile strength. The lower springback is attributed to the dislocation recovery and more stress relaxation at higher temperature. Transmission electron microscopy observations show that corrosion resistance is improved due to the enlargement in the size and the inter-particle distance of the grain boundaries precipitates. Furthermore, the achievement of the high strength is related to the uniform distribution of ultrafine η′ precipitates within grains.

► Creep age forming developed for manufacturing of aircraft wing panels by aluminum alloy. ► A good combination of properties with minimal springback is required in this component. ► This requirement can be improved through the appropriate heat treatments. ► Multi-step cycles developed in creep age forming of AA7075 for improving of springback and properties. ► Results indicate simultaneous enhancing the properties and shape accuracy (lower springback).

Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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