PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 23 (2019) 83–88

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Recently, thre -dim nsi al grain m ppi g techniques for polycrystalline mater als called X-ray diffraction contrast tomography (DCT) have received considerable at ention. DCT can simultaneou ly provide inform ti on the three-dimensional grain arrang ment of a s mple, such as the hapes, locatio s, and crystallograph c orientat s of grains, together with the isorientation f gr ins. In the present study, the twinning and the de wi ning in tension and compr ssion loading in a magnes um alloy was ob erved by the DCT using ultra-bright synchrotron radiation X-r y, and the electr ba kscatter diffraction (EBSD) analysis. The s ape of ach grain in a polycry talline magnesium alloy w successfully recon tructed and misori ntation of each crystallograph c plane was successfully meas red b DCT. With incre ing applied co pression s ress, he average value of the misorientation was d creased, while it is usually in reased with plastic strain for materials without twinning. The value of misori ntation increased with unl ading proces , indicating at the twinni g was occurr d under the compr ssive applied stress. The shape of diffraction spots of some grain also shows the twinning under the compressive stres and th detwining under the following tensile stress. The EBSD analysis of specimen surface also shows that the twinning was occurred under the compressive applied stress, and the following applied tension stress brought detwinning. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Observations of Twinning and Detwinning in Magnesium Alloy by Synchrotron Radiation DCT and EBSD Yoshikazu Nakai a, *, Daiki Shiozawa a , Shoichi Kikuchi b , Yuki Nakagawa a , Kaito Asayama a a Department of Mechanical Engineering, Kobe University, 1-1, Rokkodai, Nada, Kobe 651-2277, Japan b Department of Mechanical Engineering, Shizuoka University, 3-5-1, Johoku, Naka, Hamamatsu, Kobe 432-8561, Japan Recently, three-dimensional grain mapping techniques for polycrystalline materials called X-ray diffraction contrast tomography (DCT) have received considerable attention. DCT can simultaneously provide information on the three-dimensional grain arrangement of a sample, such as the shapes, locations, and crystallographic orientations of grains, together with the misorientation of grains. In the present study, the twinning and the detwinning in tension and compression loading in a magnesium alloy was observed by the DCT using ultra-bright synchrotron radiation X-ray, and the electron backscatter diffraction (EBSD) analysis. The shape of each grain in a polycrystalline magnesium alloy was successfully reconstructed and misorientation of each crystallographic plane was successfully measured by DCT. With increasing applied compression stress, the average value of the misorientation was decreased, while it is usually increased with plastic strain for materials without twinning. The value of misorientation increased with unloading process, indicating that the twinning was occurred under the compressive applied stress. The shape of diffraction spots of some grains also shows the twinning under the compressive stress and the detwining under the following tensile stress. The EBSD analysis of specimen surface also shows that the twinning was occurred under the compressive applied stress, and the following applied tension stress brought detwinning. 9th International Conference on Materials Structure and Micromechanics of Fracture Observations of Twinning and Detwinning in Magnesium Alloy by Synchrotron Radiation DCT and EBSD Yoshikazu Nakai a, *, Daiki Shiozawa a , Shoichi Kikuchi b , Yuki Nakagawa a , Kaito Asayama a a Departm nt of Mechan cal E ineering, Kobe University, -1, R kkod i, Nada, Kobe 651-2277, Japan b Department of Mechanical Engineering, Shizuoka University, 3-5-1, Johoku, Naka, Hamamatsu, Kobe 432-8561, Japan Abstract Abstract Keywords: Twinning; Detwinning; Magnesium alloy; ultrabright synchrotron radiation X-ray; Diffraction contrast tomography Keywords: Twinning; Detwinning; Magnesium alloy; ultrabright synchrotron radiation X-ray; Diffraction contrast tomography

* Corresponding author. Tel.: +81-78-803-6128; fax: +81-78-803-6155. E-mail address: nakai@mech.kobe-u.ac.jp * Correspon ing author. Tel.: +81-78-803-6128; fax: +81-78-803-6155. E-mail address: nakai@mech.kobe-u.ac.jp

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under t CC BY-NC-ND lic nse (http://creativecommon .org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

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