alexa Microstructures of 18R martensite induced by deformation and thermomechanical cycles in CuZnAl shape memory alloy
Materials Science

Materials Science

Journal of Material Sciences & Engineering

Author(s): M Zhu, F X Chen, D Z Yang

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Microstructures of martensite in a Cu-26.4Zn-4.8Al shape memory alloy after deformation and thermomechanical cycles are reported. By detailed transmission electron microscopy investigation, it is clearly established that the microstructure induced by deformation is different from that induced by thermomechanical cycles, and the effects on the thermoelastic martensite transformation are also not the same at all. The microstructure of martensite induced by deformation is mainly deformation twins when the deformation exceeds the range of recoverable strain of the shape memory alloy. The main microstructure characteristic of martensite which has undergone thermomechanical cycles is regularly distributed dislocations, which are mainly aligned but sometimes tangled. Micro-twins similar to those found in deformed martensite and crossed bands also exist inside the martensite of samples after thermomechanical cycles, but the amounts are too small to be regarded as important microstructure features.

This article was published in Journal of Materials Science and referenced in Journal of Material Sciences & Engineering

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