Influence of Grain Refinement and Residual Stress on Corrosion Behavior of AZ31 Magnesium Alloy Processed by ECAP in RPMI-1640 Medium

Taito Hosaka, Shouichirou Yoshihara, Iman Amanina, Bryan J. Macdonald

Research output: Contribution to journalConference article

15 Citations (Scopus)

Abstract

Influence of grain refinement and residual stress on corrosion behaviour of AZ31 magnesium alloy processed by equal-channel angular pressing (ECAP) in vitro environment has been investigated. Microstructure of magnesium alloy has been obtained by ECAP process on the different temperature conditions. RPMI-1640 medium was adopted in the immersion test to investigate the effect of the carbonate buffer system and the organic compounds on the degradation behavior of AZ31 magnesium alloy. Additionally, the residual stress of ECAP processed (ECAPed) samples measurement by X-ray diffraction (XRD) was carried out. The results of XRD investigated that residual stress of the sample increases as the forming temperature decreases. The experimental results investigated that the organic compounds which are generated on the sample surface by corrosion reaction works as effective barrier to inhibit corrosion. Besides, the grain refinement and the crystal defects, which were induced by strain, promoted development and growth of pitting corrosion. However, the corrosion resistance of the ECAPed sample processed above the re-crystallization temperature was exceeded as-received sample. Furthermore, the corrosion resistance is expected to be improved by reducing defects via subsequent aging. This study is significant for applying the magnesium alloy in the biomedical implant material.

Original languageEnglish
Pages (from-to)432-441
Number of pages10
JournalProcedia Engineering
Volume184
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes
EventAdvances in Material and Processing Technologies Conference, AMPT 2017 - Chennai, India
Duration: 2017 Dec 112017 Dec 14

Keywords

  • AZ31magnesium alloy
  • Corrosion
  • Equal-channel angular pressing
  • Influence of Grain refinement
  • residual stress
  • RPMI-1640 medium
  • X-ray diffraction

ASJC Scopus subject areas

  • Engineering(all)

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