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Changes in microstructure of a shape memory alloy (CuAlNi single crystal)

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Uploaded on Feb 25, 2010

Changes in microstructure of a shape memory alloy being heat treated and also mechanically deformed. A CuAlNi single crystal (2H orthorhombic phase ) is compressed (vertical axis) at room temperature, causing activation of two sequential twinning deformations. As austenite, the crystal is cube-shaped, whereas in the martensite form it is sheared. Six different sheared martensite crystals, having well - defined prism shapes (three of which appear in this video), can be created by pressing on 3 different faces of the cube. It is essential that the loading arrangement allows lateral displacements to occur. From TLP: Microstructural Changes. Video was kindly donated by Vaclav Novak and Petr Sittner, Department of Functional Materials Institute of Physics of the ASCR, Prague, Czech Republic. Courtesy of DoITPoMS, The University of Cambridge. Released under Creative Commons Attribution-Non-Commercial-Share Alike licence http://creativecommons.org/licenses/b...

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