Microstructural Effects During Crackling Noise Phenomena

The jerky motion of twin boundaries in the ferromagnetic shape memory alloy Ni-Mn-Ga is studied by simultaneous measurements of stress and magnetic emissions (ME). A careful design of the experimental conditions results in an approximately linear relationship between the measured ME voltage and the nm-scale volumes exhibiting twinning transformation during microsecondscale abrupt "avalanche" events. This study shows that the same distributions of ME avalanches, related to features of jerky twin boundary motion, are found both during and between stress drop events. Maximum likelihood analysis of statistical distributions of several variables reveals a good fit to power laws truncated by exponential functions. Interestingly, the characteristic cutoffs described by the exponential functions are in the middle of the distribution range. Further, the cutoff values can be related to the physical characteristics of the studied problem. Particularly, the cutoff of amplitudes of ME avalanches matches the value predicted by high rate magnetic pulse tests performed under much larger driving force values. This observation implies that avalanches during slow rate twin boundary motion and velocity changes observed by high rate tests represent the same behavior and can be described by the same theory.

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Tracking Twin Boundary Jerky Motion at Nanometer and Microsecond Scales

Bronstein

Tóth

Daróczi

et al. 2021

Adv Funct Materials

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Microstructural Effects During Crackling Noise Phenomena

Cited by 1 publication

References 86 publications

Tracking Twin Boundary Jerky Motion at Nanometer and Microsecond Scales

Tracking Twin Boundary Jerky Motion at Nanometer and Microsecond Scales

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