Effect of extrusion-ECA integrated large strain technology on microstructure and properties of 7075 aluminum alloy
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Effect of extrusion‑ECA integrated large strain technology on microstructure and properties of 7075 aluminum alloy Xiaojing Xu1 · Qingjun Liu1 · Qiang Mao1 · Ze Jiang1 · Tianci Zhang1 · Hao Chen1 · Xu Zhang1 · Donghui Du1 Received: 1 May 2020 / Accepted: 15 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In recent years, equal channel angular pressing (ECAP) which is a new technology to produce ultrafine grained materials by plastic deformation has attracted special attention. In this paper, the effects of extrusion-ECA integrated large strain technology on the structure and properties of 7075 aluminum alloys were studied by means of electron backscatter diffraction (EBSD), X-ray diffraction (XRD), hardness test, tensile test. The results show that the grain size of 7075 aluminium alloys processed by extrusion-ECA integrated large strain technology is further refined, the average grain size decreases from 8.53 to 6.55 μm. The extrusion-ECA integrated large strain technique also increases the percentage of the high-angle grain boundary of the alloy. Although the strength of the alloy is reduced, the elongation is increased from 10.17 to 15.82%. In addition, extrusion-ECA integrated large strain technology could reduce the degree of solution aging strengthening of 7075 aluminium alloys, but the plasticity of the material is significantly improved. Keywords Extrusion-ECAP integration large strain · 7075 aluminum alloy · Microstructure · Mechanical properties · Highangle grain boundary
1 Introduction 7075 aluminum alloys are a typical high-strength deformed aluminum alloy, which is widely used in aviation, aerospace, shipbuilding, weapons and other industries because of its excellent comprehensive performance [1–4]. With the continuous development of science and technology, higher requirements have been put forward for the properties of aluminium alloy materials. In recent years, the demand of high strength and high plasticity aluminium alloy materials in aerospace industry is increasing. However, it is very difficult to produce this kind of material with high strength and reasonable texture orientation by the present production technology. Therefore, high efficient and continuous large strain technology has received more and more attention in the modern metal material manufacturing system [5, 6]. Although extrusion technology can produce materials efficiently and continuously, there are many shortcomings * Xiaojing Xu [email protected] 1
Engineering Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China
in aluminium alloy extruded materials produced by existing extrusion technology, and it is difficult to meet the high requirements for materials [7]. Extrusion-ECA integrated large strain technology, which has a good control ability for crystal orientation, and can perform high-efficiency, continuous and stable large strain deformation processing on metal materials, so as to effectively solve defects such as loosen
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