Effect of applied pressure on microstructure development and homogeneity in an aluminium alloy processed by high-pressure torsion

Piotr Bazarnik , Barbara Romelczyk , Huang Yi , Małgorzata Lewandowska , Terence G. Langdon

Abstract

An investigation was conducted to evaluate the influence of applied pressure on the processing of an aluminium 5483 alloy by high-pressure torsion (HPT). Discs were processed by HPT through 1/4 to 5 revolutions at room temperature using the two different applied pressures of 1.0 and 6.0 GPa. Samples were examined after HPT using microhardness measurements and transmission electron microscopy. Colour-coded maps were constructed to show the hardness distributions and the mechanical properties were evaluated by tensile testing. It is shown that the results are dependent upon the applied pressure such that a higher pressure enhances the accumulation of defects and leads to a more rapid grain refinement. The effect of pressure is especially visible in the early stages after fractional numbers of turns since the microstructure and properties tend to homogenize at high numbers of turns. © 2016 Elsevier B.V. All rights reserved.
Author Piotr Bazarnik ZPM
Piotr Bazarnik,,
- Division of Materials Design
, Barbara Romelczyk ZPM
Barbara Romelczyk,,
- Division of Materials Design
, Huang Yi - University of Southampton
Huang Yi,,
-
, Małgorzata Lewandowska ZPM
Małgorzata Lewandowska,,
- Division of Materials Design
, Terence G. Langdon - University of Southampton, University of Southern California
Terence G. Langdon,,
-
Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388
Issue year2016
Vol688
Pages736-745
Publication size in sheets0.5
Keywords in EnglishAl-Mg alloy, Applied pressure, Grain refinement, High-pressure torsion, Microhardness
DOIDOI:10.1016/j.jallcom.2016.07.149
Languageen angielski
File
2016 JALCOM Bazarnik.pdf 2.6 MB
Score (nominal)35
ScoreMinisterial score = 35.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.133 (2) - 2016=2.919 (5)
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