Incremental Severe Plastic Deformation Effect on Mechanical and Microstructural Characteristics of AA6063
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ORIGINAL ARTICLE
Incremental Severe Plastic Deformation Effect on Mechanical and Microstructural Characteristics of AA6063 Asli Gu¨nay Bulutsuz1,2
•
Witold Chrominski1,2
Received: 22 June 2020 / Accepted: 24 October 2020 The Indian Institute of Metals - IIM 2020
Abstract In this experimental study, a commercially available AA 6063 in the form of cold profile extruded and T6 heat treated was processed by Incremental Equal Angular Pressing (I-ECAP) through the BC route. I-ECAP deformation was applied at room temperature with a feeding rate of 0.1 mm/cycle. Afterward, the effect of I-ECAP on the microstructure and mechanical properties of AA 6063 was investigated in detail. The aim of this study was to investigate the possibilities to improve properties of semi-products of commercially available aluminum alloy, especially for industrial applications. According to the visible light microscope observations 4 passes of I-ECAP
resulted in grain size reduction, which was 46%. The hardness and tensile test results showed that the I-ECAP process significantly increased mechanical properties of the billets. The hardness was 56% higher, and the mechanical strength was 37% higher than measured for the initial state. Moreover, the grain size distribution was more homogenous in the 4 I-ECAP passes processed samples than the initial state. According to these results, the I-ECAP method has potential in industrial usage for manufacturing ultrafine and fine-grain semi- and final products with superior mechanical properties.
& Asli Gu¨nay Bulutsuz [email protected] 1
Department of Mechanical Engineering, Faculty of Mechanical Engineering, Yildiz Technical University, Istanbul, Turkey
2
Faculty of Materials Science and Engineering Warsaw, University of Technology, Warsaw, Poland
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Trans Indian Inst Met
Graphic abstract
Keywords Severe plastic deformation AA 6063 I-ECAP Incremental SPD methods I-ECAP
1 Introduction Severe plastic deformation (SPD) methods are capable of producing high strength materials with an ultrafine grain size [1]. Thanks to microstructural transformations, such deformation techniques are capable of increasing material mechanical strength. The most important is grain refinement through rearrangement of dislocation structures which leads to a higher amount of grain boundary in unit area than coarse-grained structures. Moreover, due to crystallographic rotation during the deformation, the grain angles between the grains increase establishing the high angle grain boundary network. Decreased grain size and high angled grain boundaries hinder dislocation movement which result in strength increase [2, 3]. SPD methods are attractive manufacturing techniques which gains attention of many researchers until to date. Different kinds of SPD
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methods are developed which have varied deformation mechanisms. Beyond other SPD methods, Equal-Channel Angular Pressing (ECAP) is one of the popular and widely being used to produce ultrafine grained materials [4–8]. ECAP deforms the whole cross section
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