Fatigue properties of az31b magnesium alloy processed by equal-channel angular pressing

Ryuichi Yamada, Shoichiro Yoshihara, Yasumi Ito

Research output: Contribution to journalArticlepeer-review

Abstract

A stent is employed to expand a narrowed tubular organ, such as a blood vessel. However, the persistent presence of a stainless steel stent yields several problems of late thrombosis, restenosis and chronic inflammation reactions. Biodegradable magnesium stents have been introduced to solve these problems. However, magnesium-based alloys suffer from poor ductility and lower than desired fatigue performance. There is still a huge demand for further research on new alloys and stent designs. Then, as fundamental research for this, AZ31 B magnesium alloy has been investigated for the effect of equal-channel angular pressing on the fatigue properties. ECAP was con-ducted for one pass and eight passes at 300 °C using a die with a channel angle of 90°. An annealed sample and ECAP sample of AZ31 B magnesium alloy were subjected to tensile and fatigue tests. As a result of the tensile test, strength in the ECAP (one pass) sample was higher than in the annealed sample. As a result of the fatigue test, at stress amplitude σa = 100 MPa, the number of cycles to failure was largest in the annealed sample, medium in the ECAP (one pass) sample and lowest in the ECAP (eight passes) sample. It was suggested that the small low cycle fatigue life of the ECAP (eight passes) sample is attributable to severe plastic deformation.

Original languageEnglish
Article number1191
JournalMetals
Volume11
Issue number8
DOIs
Publication statusPublished - 2021 Aug

Keywords

  • Equal-channel angular pressing
  • Fatigue
  • Grain refinement
  • Magnesium alloy
  • Stent
  • S–N curve

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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