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Enhanced Wear Resistivity of a Zr-based Bulk Metallic Glass Processed by High-Pressure Torsion Under Reciprocating Dry Conditions

Title
Enhanced Wear Resistivity of a Zr-based Bulk Metallic Glass Processed by High-Pressure Torsion Under Reciprocating Dry Conditions
Authors
Soo-Hyun JooDong-Hai PiJing GuoHidemi KatoLee, SKim, HS
POSTECH Authors
Lee, SKim, HS
Date Issued
May-2016
Publisher
The Korean Institute of Metals and Materials
Abstract
Wear properties of bulk metallic glasses (BMGs) are important for industrial applications as much as strength and ductility. Free volume of BMGs is a significant factor which decides wear mechanism and resistance. Increased free volume of a Zr55Al10Ni5Cu30 BMG processed by high-pressure torsion (HPT) affected wear resistance under dry reciprocating conditions. Two- and three-body abrasive wear as well as the delamination of oxide layers simultaneously operated during the wear tests of both as-cast and HPT-processed BMG (HPT-BMG). However, the HPT- BMG had a larger area of the oxide layers on a worn surface compared to the as-cast BMG at the early stage of the wear tests. The increased free volume by the HPT process resulted in ductile plastic deformation, prohibited crack propagation, and delayed delamination of the oxide layers. Therefore, the HPT-BMG had thicker oxide layers, which acted as an adequate protection and increased wear properties of the Zr-based BMG.
URI
http://oasis.postech.ac.kr/handle/2014.oak/37467
DOI
10.1007/S12540-016-5331-3
ISSN
1598-9623
Article Type
Article
Citation
Metals and Materials International, vol. 22, no. 3, page. 383 - 390, 2016-05
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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