Abstract
The kink deformation dynamics of a unidirectionally solidified 18R LPSO alloy, which is a typical stacking material of hard and soft layers, was investigated via hybrid in situ pulsed-neutron diffraction combined with acoustic emission (AE) measurement at room temperature under the condition of mainly activating a kink deformation mode. It was found that distinctive kink formation starts after the macroscopic yield point from the evolution of neutron diffraction peaks of several lattice planes, whereas the angles between the formed kink planes and the initial undeformed planes have a broad range from the basal plane distribution after kink deformation. Additionally, the size of the formed is widely distributed from the interpretation of the absolute energy distribution of the detected AE signal. The study revealed that kink formation does not occur randomly but follows a specific statistical distribution expressed by the waiting time of the AE signal event. We propose that one possible kink formation mechanism is the incremental deformation theory that considers the effect of initial internal stress. This theory is based on the rheological treatment of stacking hard and soft layers of arbitrary mutual fractions. It may account for the experimental characteristics of the formation of ridge-type or wedge-type kinks and sinusoidal kinks of various sizes.
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Acknowledgements
The neutron diffraction experiment was performed at BL19 in the Materials and Life Science Experimental Facility at J-PARC with the proposals of 2018P0601. This study received financial support from the Japanese Kakenhi No. JP18H05479 and JP18H05476.
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Aizawa, K., Gong, W., Harjo, S., Kawasaki, T. (2021). Kink Deformation Dynamics of LPSO Alloy from the Experimental Viewpoint of Multilayer Structure Deformation. In: Luo, A., et al. Magnesium 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-72432-0_24
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DOI: https://doi.org/10.1007/978-3-030-72432-0_24
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