EFFECT OF VARIATION IN GRAIN SIZES AND TWINNING DEFORMATION ON CRACK GROWTH BEHAVIOR IN MAGNESIUM ALLOY AZ31

Keisuke Mori (), Chobin Makabe, Shin-Ichi Inoue () and Shinji Ando ()
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Keisuke Mori: Graduate Student of Engineering, University of the Ryukyus, Senbaru, Nishihara, Nakagami Okinawa 903-0213, Japan
Chobin Makabe: Department of Mechanical Engineering, University of the Ryukyus, Senbaru, Nishihara, Nakagami Okinawa 903-0213, Japan
Shin-Ichi Inoue: Magnesium Research Center, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
Shinji Ando: Graduate School of Engineering, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan

Surface Review and Letters (SRL), 2020, vol. 27, issue 08, 1-8

Abstract: Push–pull tests of rolled magnesium alloy AZ31 were performed with a side-notch plate specimen to examine the crack growth behavior under negative mean stress conditions in conditions of high humidity. The effects of repetition of compression on crack growth were discussed. The geometry of the fracture surface and the changes in microstructure were related to the crack growth behavior. The crack growth rate varied even when the experimental conditions were the same. When the oxidized powder appeared from the cracked surface, the crack growth rate became lower. That was related to the changes in microstructure while the crack grew with local shear plastic deformation. The variation of crack closure point was related to the local shear plastic deformation.

Keywords: Fatigue; crack growth; magnesium alloy; local shear; twinning; oxidized powder (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501920

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