Evolution of mechanical properties in a 7075 Al-alloy subject to natural ageing |
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| Affiliation: | 1. The complex laboratory of Hot Deformation & Thermo-mechanical Processing of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;3. Polytechnic Institute, University of Rio de Janeiro State, Department of Materials, Nova Friburgo, Brazil;1. Metallic Materials Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea;2. Department of Materials Science and Engineering, Pukyong National University, Busan 48547, Republic of Korea;3. Department of Advanced Materials Engineering, Korea University of Science and Technology, Daejeon 34113, Republic of Korea |
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| Abstract: | A series of mechanical tests was used to characterise the evolution of yield strengths, r-values and work hardening during the natural ageing of a commercial 7075 aluminium alloy. The results show that there is a significant underlying change in anisotropy between the original O-condition and solution heat treated tempers. In the absence of recrystallisation, the abrupt change in anisotropy appears to have been caused by the modification of the precipitate during the solution heat treatment. The degree of induced anisotropy remained constant throughout the natural ageing process from 15 to 120 min. A series of phenomenological functions is presented for the purpose of interpolation between the original test data points. These empirical functions are shown to predict the yield behaviour of the naturally aged material within the observed experimental scatter. |
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