38 - Analysis of kinking and twinning behavior in mg alloys by AE clustering method

摘要

LPSO (Long Period Stacking Ordered Structure)-Mg alloy has both low density and high strength, andit is expected to be applied to transport equipment. However, it is necessary to evaluate thedeformation and fracture behavior for usage as structural materials. Acoustic emission (AE) signalswere analyzed and classified using several machine learning methods to evaluate the deformationmechanism of various LPSO-Mg alloys. It is difficult to identify AE signals due to each deformationmechanism in extruded materials consisting of two phases, α-Mg phase and LPSO phase. In thisstudy, the high-speed camera was used to directly observe the kink deformation in LPSO phase andthe twinning deformation in α-Mg phase. Compression tests were carried out, and AE signals duringtests from sensors attached to the jig were continuously measured and recorded using ContinuousWave Memory (CWM) developed in our laboratory. Surface motion of specimens was captured by ahigh-speed camera using the AE signal as a trigger. Based on the recorded AE signals correspondingto kink deformation and twinning, AE behaviors of different extruded LPSO-Mg alloys weresuccessfully classified into the kinking and twinning by machine learning methods.