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Journal of Materials Engineering and Performance

, Volume 28, Issue 2, pp 1235–1252 | Cite as

Wear Resistance and Tribological Features of Ultra-Fine-Grained Al-Mg Alloys Processed by Constrained Groove Pressing-Cross Route

  • J. Mozafari
  • F. KhodabakhshiEmail author
  • H. Eskandari
  • M. Haghshenas
Article
  • 44 Downloads

Abstract

In the present study, the wear behavior of ultra-fine grained (UFG) Al-Mg alloys produced by a severe plastic deformation (SPD) method was assessed and compared against the annealed coarse-grained alloy. To this end, weight loss, wear resistance, friction coefficient, and morphology of the worn surfaces was investigated. Constrained groove pressing-cross route (CGP-CR) process, an SPD technique, was implemented at ambient temperature up to two passes to impose an equivalent plastic strain of about 4.64. Formation of a UFG structure with an average sub-grain size of ~ 350 nm with an enhanced tensile strength of up to ~ 225 MPa and indentation hardness of up to ~ 95 HV were achieved upon two passes of CGP-CR process. The pin-on-disk dry wear sliding testing was conducted up to a distance of 1000 m under normal loads of 5, 7, and 9 N at a constant sliding speed of 0.5 m/s. The trends measured for the evaluation of wear properties/mechanisms are discussed based on the microstructural features and mechanical property of UFGed alloys. The results showed that by employing the CGP-CR process and through the formation of UFG structure, the wear resistance was considerably increased. This was even beyond two times (~ 100%) larger depending on the normal loading with the lowest coefficient of friction around 0.6. Observation and study of the morphology of the worn surfaces under field emission-scanning electron microscopy (FE-SEM) revealed a change in the wear mechanism from sticking followed by formation of plastic deformation bands and delamination in the coarse-grained annealed alloy into a combined abrasive-adhesive behavior in the UFG material.

Keywords

Al-Mg alloy constrained groove pressing-cross route (CGP-CR) fractography severe plastic deformation (SPD) ultra-fine-grained (UFG) wear resistance 

Supplementary material

11665_2019_3859_MOESM1_ESM.docx (185 kb)
Supplementary material 1 (DOCX 185 kb)

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Copyright information

© ASM International 2019

Authors and Affiliations

  • J. Mozafari
    • 1
  • F. Khodabakhshi
    • 2
    Email author
  • H. Eskandari
    • 1
  • M. Haghshenas
    • 3
  1. 1.Department of Mechanical EngineeringPersian Gulf UniversityBushehrIran
  2. 2.School of Metallurgical and Materials Engineering, College of EngineeringUniversity of TehranTehranIran
  3. 3.Department of Mechanical EngineeringUniversity of North DakotaGrand ForksUSA

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