Ratcheting strain and microstructure evolution of AZ31B magnesium alloy under a tensile-tensile cyclic loading

Zhifeng Yan, Denghui Wang, Wenxian Wang, Jun Zhou, Xiuli He, Peng Dong, Hongxia Zhang, Liyong Sun

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

In this paper, studies were conducted to investigate the deformation behavior and microstructure change in a hot-rolled AZ31B magnesium alloy during a tensile-tensile cyclic loading. The relationship between ratcheting effect and microstructure change was discussed. The ratcheting effect in the material during current tensile-tensile fatigue loading exceeds the material's fatigue limit and the development of ratcheting strain in the material experienced three stages: initial sharp increase stage (Stage I); steady stage (Stage II); and final abrupt increase stage (Stage III). Microstructure changes in Stage I and Stage II are mainly caused by activation of basal slip system. The Extra Geometrically Necessary Dislocations (GNDs) were also calculated to discuss the relationship between the dislocation caused by the basal slip system and the ratcheting strain during the cyclic loading. In Stage III, both the basal slip and the (11-20) twins are found active during the crack propagation. The fatigue crack initiation in the AZ31B magnesium alloy is found due to the basal slip and the (11-20) tensile twins.

Original languageEnglish (US)
Article number513
JournalMaterials
Volume11
Issue number4
DOIs
StatePublished - Mar 28 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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