| Dynamics of Kink Formation Behavior under Compressive Stress via Hybrid Measurement of In Situ Neutron Diffraction and Acoustic Emission Kazuya Aizawa1; Wu Gong2; Stefanus Harjo3; Takuro Kawasaki1; 1JAPAN ATOMIC ENERGY AGENCY, Tokai-mura, Japan; 2KYOTO UNIVERSITY, Tokai-mura, Japan; 3JAPAN ATOMIC ENERGY AGENCY, Naka-gun, Japan; PAPER: 237/Magnesium/Regular (Oral) SCHEDULED: 14:50/Fri. 25 Oct. 2019/Adonis ABSTRACT: Dynamics of kink formation behavior under compressive stress on the 18R Mg-based LPSO alloy, prepared by the one-directional solidification technique, will be presented. This technique uses materials of high strength dual phase Mg-based LPSO alloys [1]. This is observed at room temperature via a hybrid measurement of in situ neutron diffraction and acoustic emission (AE). By in situ neutron diffraction, we revealed the relationship between the basal plane strains and kink formation. On the other hand, by AE measurement, we obtained statistics about kink formation size by analysis of AE absolute energy which consists of flat behavior in low energy regions and power law behavior in higher energy regions. This is basic knowledge for introducing kink structure efficiently. In the AE data plot, we can clearly observe the emergence of an amoeba which is defined by the image of the logarithm of the absolute complex coordinates of the plane complex algebraic curve in the mathematics context. This excludes the scale factor. Specifically, a plot of the energy-difference between (n+1) and n events versus energy-difference between n and (n-1) events indicates an amoeba whose Newton polygon consists of the coordinates (0,0), (1,0) and (0,1). This characteristic has deep meaning regarding the dynamics of kink formation. This reveals that the statistical sequence of kink formation is governed by a simple complex algebraic curve. References: [1] Y. Kawamura et al., Material Transactions 42 (2001) 1172-1176. |
