郑州会计网International Journal of Minerals, Metallurgy and Materials Volume 26, Number 8, August 2019, Page 1005
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doi/10.1007/s12613-019-1806-9
自立教育Corresponding author: Salman Nourouzi E-mail: s-nourouzi@nit.ac.ir
© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Microstructure and mechanical properties of AA6063 aluminum alloy wire fabricated by friction stir back extrusion (FSBE) processman to man
Gham Jamali, Salman Nourouzi, and Roohollah Jamaati
财务部负责人职责
Department of Materials Engineering, Babol Noshirvani University of Technology, Babol 47148–71167, Iran.
(Received: 2 September 2018; revid: 10 April 2019; accepted: 15 April 2019)
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Abstract: In the prent work, the friction stir back extrusion (FSBE) process was ud as a novel method for the fabrication of AA6063 aluminum alloy wire. Scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), tensile and hardness tests were performed. The FSBE via the rotational speed of 475 r/min resulted in fine equiaxed grains, and the mean grain size decread from 179.0 μm to 15.5 μm due to the occurrence of dynamic recrystallization (DRX). Heat generated by the FSBE changed the size and volume fraction of the Mg2Si precipitated particles. The minimum particle size and maximum volume fraction obtained in the sample were procesd by rotational speeds of 475 and 600 r/min, respectively. The 475-r/min sample had the maximum hardness value due to having the lowest grain size (i.e., 15.5 μm) and the prence of many fine Mg2Si precipitates in the aluminum matrix. With increasing rotational speed up to 600 r/min, the hardness decread, owing to the growth of both grains and precipitates. The FSBE process with a rotational speed of 475 r/min incread the tensile strength (from 150 to 209 MPa) and ductility (from 21.0% to 30.2%) simultaneously.thepang
Keywords: aluminum alloys; friction stir back extrusion; microstructure; mechanical properties
1. Introduction
One of the most important heat-treatable wrought alumi-num alloys is AA6063. This alloy is widely ud in the au-tomotive and building industries due to its excellent forma-bility, very good corrosion resistance, and relatively low cost. However, due to its low hardness and medium strength and toughness, application of the AA6063 alloy is limited [1–4]. The mechanical properties of this alloy mainly depend on the distribution, volume fraction, and size of the Mg2Si pre-cipitates in the aluminum matrix [3–4]. Up to now, much rearch has been dedicated to improving the strength, tough-ness, and hardness of the AA6063 alloy using heat treatment, deformation, and thermo-mechanical process [5–10].
Das et al. [5] examined the effect of temperature and time on the mechanical properties of the AA6063 aluminum alloy by the ball indentation technique. Mechanical properties of the alloy after treatment with solution and 3 h aging were similar to the as-received sample. However, after 7 h aging treatment, the hardness, yield strength (YS), and ultimate tensile strength incread. Siddiqui et al. [6] investigated the effect of aging parameters on the microstructure and me-chanical propertie
netscapes under solid solution, peak aging, and overaging conditions. Panigrahi et al. [7] found that the ini-tial plastic deformation could improve the mechanical prop-erties of the alloy after aging treatment. Al-Marahleh [2] examined the role of heat treatment and thermo-mechanical process in the better distribution of the precipitates during aging. Heat treatment of AA6063 was insufficient for the formation of a uniform microstructure while the ther-mo-mechanical process was more efficient. Some rearch-ers [8–9] investigated the mechanical behavior of the AA6063 aluminum alloy after vere plastic deformation by equal channel angular pressing (ECAP). In the AA6063 al-loy procesd by ECAP, there was a total increa in the ultimate compression strength (> 70%), YS (228%), com-pression modulus (243%), and microhardness (103%) com-pared to the as-received material. Sato et al. [10] applied friction stir processing to the AA6063 aluminum alloy sheet. They investigated the effect of process parameters on the microstructure and hardness of the nugget zone, heat-affected zone, and thermo-mechanically affected zone.dic
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