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Superelastic NiTi wires were deformed in tension up to gradually increasing total strains at various test temperatures, recoverable strains were evaluated and lattice defects left in the microstructure of deformed and heated wires were analyzed by TEM. It is concluded that the plastic deformation of NiTi wires is initiated by deformation twinning in oriented martensite, accompanied by dislocation slip in austenite and/or martensite in extent depending on the test temperature and total strain.
Contact: Petr Šittner