Enhancing in-plane fatigue resistance of rolled AZ31 magnesium alloy by pre-straining

Sung Hyuk Park, Seong Gu Hong, Chong Soo Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Rolled AZ31 magnesium alloy has a strong basal texture so that it favors extensive twinning under compressive loading, resulting in a low compressive flow stress compared to a tensile flow stress; this induced a tensile mean stress, which reduced the fatigue resistance during fatigue deformation. The improvement of fatigue resistance was attempted by reducing the developed tensile mean stress, which was achievable by the fact that the lattice reorientation caused by twinning during compressive loading favors detwinning in the twined regions during the subsequent tensile reloading, leading to a significant drop in tensile flow stress. The variation of the twinning-detwinning characteristics was made by pre-compressions of 2, 5, and 8 % and their effect was evaluated at the fully reversed strain amplitude of 1 % at room temperature. The enhancement of fatigue resistance was explained in the relation with the amount of pre-compression.

Original languageEnglish
Title of host publicationLinking Science and Technology for Global Solution - Proceedings of Symposia held during TMS 2009 Annual Meeting and Exhibition
Pages71-76
Number of pages6
StatePublished - 2009
EventTMS 2009 Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: 16 Feb 200919 Feb 2009

Publication series

NameTMS Annual Meeting

Conference

ConferenceTMS 2009 Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Francisco, CA
Period16/02/0919/02/09

Keywords

  • Low-cycle fatigue
  • Magnesium alloy
  • Pre-straining
  • Twinning-detwinning

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