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Metals 2019, 9(2), 196; https://doi.org/10.3390/met9020196

Examination of the High Tensile Ductility Improvement in an As-Solutionized AA7075 Alloy with the Aid of a Friction Stir Process

Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
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Received: 9 January 2019 / Revised: 24 January 2019 / Accepted: 5 February 2019 / Published: 7 February 2019
(This article belongs to the Special Issue Heat Treatment of Aluminum Alloys)
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Abstract

The ductility enhancement of an AA7075 aluminum alloy aided by a friction stir process (FSP) and various heat treatments was investigated and compared in terms of outcome with full annealing (O). The results indicate that a big improvement in the tensile ductility was achieved by freezing the sample at temperatures below 0 °C after the solution treatment and water quenching (W treatment), and further improvement could be acquired via a friction stir process due to grain refinement (<6 μm). Thus, the observed improvement in tensile ductility can be explained by the fact that the W treatment and friction stir processing scheme had an increased strain-hardening effect and decreased the presence of intermetallic particles that are harmful to uniform tensile deformation, consequently causing strain localization in the early stage of tensile deformation, which suggests that these treatment are a potential solution for insufficient formability. In general, the elongation to failure values for the W and FSP-treated specimens (>40%) were at least 1.5-fold greater than that of the annealed alloy. In addition, serrated flow could be observed in the tensile flow curves, and both the Piobert–Lüders effect and the Portevin–LeChatelier (PL) effect could be observed. The enhancement in the tensile ductility was examined in terms of the existence of intermetallic particles and the supersaturated concentration of the solid solution. View Full-Text
Keywords: AA7075 aluminum alloy; friction stir process (FSP); heat treatment; tensile ductility; Portevin–LeChatelier effect AA7075 aluminum alloy; friction stir process (FSP); heat treatment; tensile ductility; Portevin–LeChatelier effect
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Ku, M.-H.; Hung, F.-Y.; Lui, T.-S. Examination of the High Tensile Ductility Improvement in an As-Solutionized AA7075 Alloy with the Aid of a Friction Stir Process. Metals 2019, 9, 196.

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