Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy
In this study, the effects of cerium (Ce) addition on the friction and wear properties of surface welding AZ91 magnesium alloys were evaluated by pin-on-disk dry sliding friction and wear tests at normal temperature. The results show that both the friction coefficient and wear rate of surfacing magn...
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doaj-5696fdb2d6d64d8c94abbcd05d3522c72020-11-24T23:21:20ZengMDPI AGMaterials1996-19442018-02-0111225010.3390/ma11020250ma11020250Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 AlloyQingqiang Chen0Zhihao Zhao1Qingfeng Zhu2Gaosong Wang3Kai Tao4School of Materials Science & Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Materials Science & Engineering, Northeastern University, Shenyang 110819, ChinaKey Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, ChinaKey Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, ChinaKey Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, ChinaIn this study, the effects of cerium (Ce) addition on the friction and wear properties of surface welding AZ91 magnesium alloys were evaluated by pin-on-disk dry sliding friction and wear tests at normal temperature. The results show that both the friction coefficient and wear rate of surfacing magnesium alloys decreased with the decrease in load and increase in sliding speed. The surfacing AZ91 alloy with 1.5% Ce had the lowest friction coefficient and wear rate. The alloy without Ce had the worst wear resistance, mainly because it contained a lot of irregularly shaped and coarse β-Mg17Al12 phases. During friction, the β phase readily caused stress concentration and thus formed cracks at the interface between β phase and α-Mg matrix. The addition of Ce reduced the size and amount of Mg17Al12, while generating Al4Ce phase with a higher thermal stability. The Al-Ce phase could hinder the grain-boundary sliding and migration and reduced the degree of plastic deformation of subsurface metal. Scanning electron microscopy observation showed that the surfacing AZ91 alloy with 1.5% Ce had a total of four types of wear mechanism: abrasion, oxidation, and severe plastic deformation were the primary mechanisms; delamination was the secondary mechanism.http://www.mdpi.com/1996-1944/11/2/250AZ91 magnesium alloysurfacing weldwear resistancecerium |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qingqiang Chen Zhihao Zhao Qingfeng Zhu Gaosong Wang Kai Tao |
spellingShingle |
Qingqiang Chen Zhihao Zhao Qingfeng Zhu Gaosong Wang Kai Tao Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy Materials AZ91 magnesium alloy surfacing weld wear resistance cerium |
author_facet |
Qingqiang Chen Zhihao Zhao Qingfeng Zhu Gaosong Wang Kai Tao |
author_sort |
Qingqiang Chen |
title |
Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy |
title_short |
Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy |
title_full |
Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy |
title_fullStr |
Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy |
title_full_unstemmed |
Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy |
title_sort |
cerium addition improved the dry sliding wear resistance of surface welding az91 alloy |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2018-02-01 |
description |
In this study, the effects of cerium (Ce) addition on the friction and wear properties of surface welding AZ91 magnesium alloys were evaluated by pin-on-disk dry sliding friction and wear tests at normal temperature. The results show that both the friction coefficient and wear rate of surfacing magnesium alloys decreased with the decrease in load and increase in sliding speed. The surfacing AZ91 alloy with 1.5% Ce had the lowest friction coefficient and wear rate. The alloy without Ce had the worst wear resistance, mainly because it contained a lot of irregularly shaped and coarse β-Mg17Al12 phases. During friction, the β phase readily caused stress concentration and thus formed cracks at the interface between β phase and α-Mg matrix. The addition of Ce reduced the size and amount of Mg17Al12, while generating Al4Ce phase with a higher thermal stability. The Al-Ce phase could hinder the grain-boundary sliding and migration and reduced the degree of plastic deformation of subsurface metal. Scanning electron microscopy observation showed that the surfacing AZ91 alloy with 1.5% Ce had a total of four types of wear mechanism: abrasion, oxidation, and severe plastic deformation were the primary mechanisms; delamination was the secondary mechanism. |
topic |
AZ91 magnesium alloy surfacing weld wear resistance cerium |
url |
http://www.mdpi.com/1996-1944/11/2/250 |
work_keys_str_mv |
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1725571921598218240 |