Multiple Avalanche Processes in Acoustic Emission Spectroscopy: Multibranching of the Energy−Amplitude Scaling


Type
Article
Change log
Authors
Chen, Y 
Gou, B 
Yuan, B 
Ding, X 
Sun, J 
Abstract

jats:sec<jats:label />jats:pSeveral physical processes can conspire to generate avalanches in materials. Such processes include avalanche mechanisms like dislocation movements, friction processes by pinning magnetic domain walls, moving dislocation tangles, hole collapse in porous materials, collisions of ferroelectric and ferroelastic domain boundaries, kinks in interfaces, and many more. Known methods to distinguish between these species which allow the physical identification of multiavalanche processes are reviewed. A new approach where the scaling relationship between the avalanche energies jats:italicE</jats:italic> and amplitudes jats:italicA</jats:italic> is considered is then described. Avalanches with single mechanisms scale experimentally as jats:italicE</jats:italic> = jats:italicSjats:subi</jats:sub></jats:italic>jats:italicAjats:subi</jats:sub></jats:italic>jats:sup2</jats:sup>. The energy jats:italicE</jats:italic> reflects the duration jats:italicD</jats:italic> of the avalanche and jats:italicA</jats:italic>(jats:italict</jats:italic>), the temporal amplitude. The scaling prefactor jats:italicS</jats:italic> depends explicitly on the duration of the avalanche and on details of the avalanche profiles. It is reported that jats:italicS</jats:italic> is not a universal constant but assumes different values depending on the avalanche mechanism. If avalanches coincide, they can still show multivalued scaling between jats:italicE</jats:italic> and jats:italicA</jats:italic> with different jats:italicS</jats:italic>‐values for each branch. Examples for this multibranching effect in low‐Ni 316L stainless steel, 316L stainless steel, polycrystalline Ni, TC21 titanium alloy, and a Fejats:sub40</jats:sub>Mnjats:sub40</jats:sub>Cojats:sub10</jats:sub>Crjats:sub10</jats:sub> high‐entropy alloy are shown.</jats:p></jats:sec>

Description
Keywords
acoustic emissions, avalanches, deformation mechanisms
Journal Title
Physica Status Solidi (B) Basic Research
Conference Name
Journal ISSN
0370-1972
1521-3951
Volume Title
Publisher
Wiley
Sponsorship
Engineering and Physical Sciences Research Council (EP/P024904/1)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (861153)
Engineering and Physical Sciences Research Council (EP/L014793/1)