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An investigation on the tribological behavior of AZ91 and AZ91+3wt% RE magnesium alloys at elevated temperatures

Version 2 2024-06-13, 12:29
Version 1 2019-05-17, 12:55
journal contribution
posted on 2024-06-13, 12:29 authored by A Zafari, HM Ghasemi, R Mahmudi
The wear behavior of AZ91 and AZ91+3wt% RE magnesium alloys was investigated under a normal load of 20N at the wear testing temperatures of 25-250°C and sliding speeds of 0.4 and 1ms-1. As the sliding speed increased from 0.4 to 1ms-1 at the wear temperature of 25°C, the wear rates of AZ91 and AZ91+3wt% RE alloys decreased by about 8% and 60%, respectively. With an increase in the wear temperature to 100°C, the wear rate of AZ91 alloy was reduced by 58% at a sliding speed of 0.4ms-1, while the wear rate was sharply increased at a sliding speed of 1ms-1. At higher wear temperatures, the wear of the AZ91 alloy at both sliding speeds soared as a result of the softening of β-Mg17Al12 phase. However, the wear rate of AZ91+3wt% RE alloy showed a minimum at the wear temperatures of 100 and 200°C at sliding speeds of 1 and 0.4ms-1, respectively. Superior wear behavior of AZ91+3wt% RE at the elevated temperatures could be attributed to its higher thermal stability and strength. Furthermore, a rise in sliding speed led to a 55% reduction in the wear rate of AZ91+3wt% RE alloy at the wear temperature of 100°C due to the formation of stable oxide layers on the wear surface.

History

Journal

Materials and design

Volume

54

Pagination

544-552

Location

Amsterdam, The Netherlands

ISSN

0264-1275

eISSN

1873-4197

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2013, Elsevier Ltd

Publisher

Elsevier