The effects of microstructure on crackling noise during martensitic transformation in Cu-Al-Ni

Eilon Faran, Hanus Seiner, Michal Landa, Doron Shilo

Research output: Contribution to journalArticlepeer-review

Abstract

Martensitic phase transformations often exhibit crackling noise response of the emitted energy. This type of behavior implies that the phase transformation proceeds through numerous events that do not exhibit any characteristic scale. On the other hand, the twinned microstructure along the phase boundary exhibits a characteristic size that is expected to affect the propagation of the phase boundary. Here, we present a statistical analysis of jerky events during martensitic transformation, induced by uniaxial compression of a single crystal Cu-Al-Ni. The results indicate that the characteristic length scale of the internal twinned microstructure dictates μ m-scale displacement events of the phase boundary. At the same time, each of these μ m-scale events proceeds through a multitude of smaller events that span several orders of magnitude and follow a scale-invariant power law distribution. The smaller events are associated with the local nucleation and propagation of twinning interfaces close to the phase boundary.

Original languageEnglish
Article number171601
JournalApplied Physics Letters
Volume107
Issue number17
DOIs
StatePublished - 26 Oct 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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