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Effects of solution treatment and sheath on mechanical properties of Al7075 processed by ECAP

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Abstract

Al7075 as a hard-to-work alloy is processed difficultly by Equal channel angular pressing (ECAP) at room temperature. In this paper, experiments were conducted at several heat treatment conditions and also with a new developing strategy using sheath copper to process this alloy at room temperature. Mechanical properties were evaluated by tensile and micro hardness tests. The results demonstrated that the ultimate and yield strength of ECAPed aged samples improved. Tensile test of 4 pass processed samples with copper sheath indicated an increase in the strength in comparison with samples without sheath. The hardness test results showed more uniform distribution of hardness in their cross section for copper sheath casing samples. It was found that by increasing the copper sheath thickness, the hardness variation decreased while the average hardness increased. By considering the time limitation for the process, only solid solution samples without sheath could be successfully ECAPed in 2 passes and samples with sheath could be ECAPed only in one pass.

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Authors and Affiliations

  1. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

    S. Ahmadi & M. Sedighi

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  1. S. Ahmadi
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Correspondence to S. Ahmadi.

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Recommended by Associate Editor Jin Weon Kim

M. Sedighi is a Professor of Manufacturing Engineering at School of Mechanical Engineering in Iran University of Science and Technology. He received his Ph.D. in Mechanical Engineering from Bristol University, UK. His interests include metal forming, modeling of manufacturing processes and residual stresses.

S. Ahmadi is a Ph.D. candidate of School of Mechanical Engineering, Urmia University. He received his master’s degree in manufacturing engineering from Iran University of Science and Technology (IUST). His researches interests include severe plastic deformation, microstructure, and heat treatment study in metal forming processes.

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Ahmadi, S., Sedighi, M. Effects of solution treatment and sheath on mechanical properties of Al7075 processed by ECAP. J Mech Sci Technol 31, 4189–4194 (2017). https://doi.org/10.1007/s12206-017-0816-7

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  • DOI: https://doi.org/10.1007/s12206-017-0816-7

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