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Wear properties of high pressure torsion processed ultrafine grained Al-7%Si alloy SCIE SCOPUS

Title
Wear properties of high pressure torsion processed ultrafine grained Al-7%Si alloy
Authors
Abd El Aal, MIKim, HS
Date Issued
2014-01
Publisher
ELSEVIER SCI LTD
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.
Keywords
Severe plastic deformation; High pressure torsion; Ultrafine grained materials; Grain refinement; Wear; Al-Si alloy; AL-SI ALLOYS; BEHAVIOR; MICROSTRUCTURE; REFINEMENT; RESISTANCE
URI
https://oasis.postech.ac.kr/handle/2014.oak/14572
DOI
10.1016/J.MATDES.2013.07.045
ISSN
0261-3069
Article Type
Article
Citation
MATERIALS & DESIGN, vol. 53, page. 373 - 382, 2014-01
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