Effects of strain rate on the low cycle fatigue behavior of AZ31B magnesium alloy processed by SMAT

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Suzhou Wu

Detail(s)

Original languageEnglish
Pages (from-to)536-546
Journal / PublicationJournal of Alloys and Compounds
Volume735
Online published11 Nov 2017
Publication statusPublished - 25 Feb 2018

Abstract

A gradient nanocrystallined (NC) surface layer was generated on AZ31b magnesium alloy by means of surface mechanical attrition treatment (SMAT). The effects of strain rate and ball size on low cycle fatigue behavior of the SMATed samples were studied under strain-controlled mode. It is found that under the same strain rate, the fatigue life of the SMATed samples is significantly enhanced compared with the coarse-grained (CG) samples, and that the fatigue life of the SMATed samples treated with 3 mm balls is longer than that of those treated with 2 mm balls. The enhanced fatigue life of the SMATed samples is mainly attributed to the combined influences of compressive residual stress and NC surface layer suppressing the initiation of cracks. Meanwhile, for both the SMATed and the CG samples, the fatigue life increases with increasing strain rate, owing to the fact that high strain rate favors twinning activity and restricts dislocation slip, thus enhancing the fatigue crack resistance and prolonging the fatigue life.

Research Area(s)

  • Low cycle fatigue, Magnesium alloy, Strain rate, Surface mechanical attrition treatment

Citation Format(s)

Effects of strain rate on the low cycle fatigue behavior of AZ31B magnesium alloy processed by SMAT. / Chen, Gang; Gao, Jianwen; Cui, Yun; Gao, Hong; Guo, Xiang; Wu, Suzhou.

In: Journal of Alloys and Compounds, Vol. 735, 25.02.2018, p. 536-546.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal