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Wear properties of high pressure torsion processed ultrafine grained Al-7\%Si alloy
Faculty
Science
Year:
2014
Type of Publication:
Article
Pages:
373-382
Authors:
Abd El Aal, Mohamed Ibrahim, Kim, Hyoung Seop
DOI:
10.1016/j.matdes.2013.07.045
Journal:
MATERIALS \& DESIGN ELSEVIER SCI LTD
Volume:
53
Research Area:
Materials Science
ISSN
ISI:000326805500046
Keywords :
Severe plastic deformation, High pressure torsion, Ultrafine grained materials, Grain refinement, Wear, Al-Si alloy
Abstract:
In this paper, Al-7 wt\% Si alloy was processed via high pressure torsion (HPT) at an applied pressure 8 GPa for 10 revolutions at room temperature. The microstructure and hardness of the HPT samples were investigated and compared with those of the as-cast samples. The wear properties of as-cast and the HPT samples under dry sliding conditions using different sliding distances and loads were investigated by reciprocated sliding wear tests. The HPT process successfully resulted in nanostructure Al-7 wt\% Si samples with a higher microhardness due to the finer Al matrix grains and Si particles sizes with more homogeneous distribution of the Si particles than those in the as-cast samples. The wear mass loss and coefficient of friction values were decreased after the HPT process. The wear mechanism was observed to be adhesive, delamination, plastic deformation bands and oxidization in the case of the as-cast alloy. Then, the wear mechanism was transformed into a combination of abrasive and adhesive wear after the HPT process. The oxidization cannot be considered as a mechanism that contributes to wear in the case of HPT samples, because O-2 was not detected in all conditions. (C) 2013 Elsevier Ltd. All rights reserved.
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