Deformation behaviors and cyclic strength assessment of AZ31B magnesium alloy based on steady ratcheting effect

Zhifeng Yan, Denghui Wang, Xiuli He, Wenxian Wang, Hongxia Zhang, Peng Dong, Chenhao Li, Yuli Li, Jun Zhou, Zhuang Liu, Liyong Sun

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

In this paper, deformation behaviors and microstructure evolution of a hot-rolled AZ31B magnesium alloy under cyclic loadings are investigated. The relationship between plastic deformation and microstructure evolution and the crack formation mechanisms are discussed. Under a high cyclic stress (90–140 MPa), steady ratcheting effect occurred in the material and the development of ratcheting strain went through three stages: 1) Stage I - initial rapid increase stage; 2) Stage II - steady stage; and 3) Stage III - final abrupt increase stage. Under a low cyclic stress (≤ 90 MPa), inconspicuous ratcheting effect was found in the material, indicating a light damage in the material. When the cyclic stress is below 30 MPa, no ratcheting effect is found and only elastic deformation occurs in the material. The formation of cracks in Stages I & II is mainly due to the activation of the basal slip system. The mean geometrically necessary dislocations (GND) are calculated to analyze the relationship between the basal slip and the ratcheting effect during the cyclic loading. Finally, a new approach is proposed to estimate the AZ31B magnesium alloy's cyclic strength (at 107 cycles) according to the cyclic stress at which steady ratcheting effect starts to occur in the material.

Original languageEnglish (US)
Pages (from-to)212-220
Number of pages9
JournalMaterials Science and Engineering A
Volume723
DOIs
StatePublished - Apr 18 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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