Journal of Ultrafine Grained and Nanostructured Materials

Journal of Ultrafine Grained and Nanostructured Materials

Mechanical properties and pitting corrosion behavior of Al5085 alloy processed via ECAP

Document Type : Research Paper

Authors
Milad Aali Majidabad
Ali Reza Rezaei
Mohammad Reza Sabour
Ghader Faraji
School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran.
10.22059/jufgnsm.2023.01.05
Abstract
In this paper, the impact of the number of passes of equal channel angular pressing (ECAP) on mechanical properties and corrosion behavior of Al5085 alloys in an HNO3 solution is investigated. After a single pass of ECAP, the ultimate tensile strength (UTS) was increased noticeably from 275 MPa to 342 MPa. Also, the yield strength (YS) and microhardness were improved from ~82 MPa to ~118.5 MPa and 94 HV to 136 HV, respectively. After the second pass all UTS, YS, and microhardness increased by ~13.5%, ~17.8%, and ~11.7% compared to the first pass. Meanwhile, the elongation to failure was reduced by ~15% and ~7.5% after one and two passes of the ECAP, respectively. According to scanning electron microscope (SEM) micrographs, unlike the unprocessed sample in which there is no evidence of pitting corrosion occurrence, after one pass ECAP, the pitting corrosion occurred through all the surfaces of the sample. Also, there is no evidence of pitting corrosion after two passes of ECAP.
Keywords
Equal channel angular pressing (ECAP)
Corrosion
Pitting corrosion
mechanical properties
severe plastic deformation (SPD)
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Journal of Ultrafine Grained and Nanostructured Materials
Volume 56, Issue 1
June 2023
Pages 42-49

  • Receive Date 19 April 2023
  • Revise Date 01 June 2023
  • Accept Date 02 June 2023