Abstract:The microstructural origin of the internal friction response in B19' martensitic NiTiCu polycrystals is investigated by in situ TEM straining experiments. Internal friction measurements showed that the transient contribution Q 21Tr , determined as a function of temperature in martensitic state, vanishes when the heating or cooling is stopped. In situ TEM experiments evidence defects moving across the martensitic variants along the microtwin boundaries. They are identified as partial dislocations (PDs). They mo… Show more
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