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Microstructural features, texture and strengthening mechanisms of nanostructured AA6063 alloy processed by powder metallurgy SCIE SCOPUS

Title
Microstructural features, texture and strengthening mechanisms of nanostructured AA6063 alloy processed by powder metallurgy
Authors
Asgharzadeh, HSimchi, AKim, HS
Date Issued
2011-05-15
Publisher
ELSEVIER SCIENCE SA
Abstract
Nanostructured AA6063 (NS-Al) powder with an average grain size of similar to 100 nm was synthesized by high-energy attrition milling of gas-atomized AA6063 powder followed by hot extrusion. The microstructural features of the consolidated specimen were studied by transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) techniques and compared with those of coarse-grained AA6063 (CG-Al) produced by hot powder extrusion of gas-atomized powder (without using mechanical milling). The consolidated NS-Al alloy consisted of elongated ultrafine grains (aspect ratio of similar to 2.9) and equiaxed nanostructured grains. A high fraction (similar to 78%) of high-angle grain boundaries with average misorientation angle of 33 was noticed. Microtexture evaluation by plotting pole-figures and orientation distribution function (ODF) analysis showed Copper and P texture components for both the consolidated Al alloys. Tensile test at room temperature and microhardness measurement revealed that a significant improvement in the strength of AA6063 alloy is obtained through refinement of the grain structure. The strengthening mechanisms are discussed based on the dislocation-based models The role of high-angle and low-angle grain boundaries on the strengthening mechanisms is discussed. (C) 2011 Elsevier B.V. All rights reserved.
Keywords
Nanostructured materials; Aluminum alloys; Microstructure; Texture; Strengthening mechanism; ULTRAFINE-GRAINED ALUMINUM; HIGH-PRESSURE TORSION; AL-MG ALLOY; PURE ALUMINUM; DEFORMATION; BEHAVIOR; EVOLUTION; HARDNESS; ECAP; CONSOLIDATION
URI
https://oasis.postech.ac.kr/handle/2014.oak/17459
DOI
10.1016/J.MSEA.2011.01.082
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 528, no. 12, page. 3981 - 3989, 2011-05-15
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