Friction in ferroelastic and martensitic materials

1st International Conference on Rheology and Modeling of Materials

物理学;材料科学

Salje, E.K.H.^1

Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, United Kingdom^1

关键词: Avalanche dynamics;    Experimental methods;    Internal structure;    Martensite phase transformation;    Martensitic materials;    Phonon spectroscopy;    Statistical evaluation;    Time evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/602/1/012018/pdf
DOI  :  10.1088/1742-6596/602/1/012018

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Friction during ferroelastic and martensite phase transformations and under external elastic forcing is related to the appearance of jerks as fingerprint for avalanches of moving domain boundaries. It is argued that such avalanches can be observed if the time scale of the experiment is sufficiently long to allow a statistical evaluation and have a time resolution compatible with the characteristic duration of an avalanche. Typical experimental methods include the observation of acoustic emission, resonance elastic spectroscopy, calorimetry, and advanced phonon spectroscopy. The changes of the internal structure of mobile twin boundaries contribute to changes in their mobility and their friction. The local structures of jammed twin boundary patterns are elucidated by computer simulation, their time evolution is similar to that of observed avalanche dynamics.