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Abstract NiTi/amorphous-CuZrAl and NiTiNbFe/amorphous-CuZrAl multilayered thin films with various individual layer thicknesses were fabricated by magnetron sputtering and annealing. NiTi is a transforming constituent which undergoes martensitic transformation during plastic… Click to show full abstract
Abstract NiTi/amorphous-CuZrAl and NiTiNbFe/amorphous-CuZrAl multilayered thin films with various individual layer thicknesses were fabricated by magnetron sputtering and annealing. NiTi is a transforming constituent which undergoes martensitic transformation during plastic deformation while NiTiNbFe is plastically deformed by dislocation slip at room temperature. Nanoindentation tests showed that the hardness of NiTi/a-CuZrAl was comparable with that of NiTiNbFe/a-CuZrAl, despite that the hardness of monolithic NiTi film was only half of that of monolithic NiTiNbFe, in contrast to the rule of mixture. Strain rate sensitivity measurements suggested that NiTi improved the strain rate sensitivity of amorphous CuZrAl layers via martensitic transformation. As a result, the amorphous CuZrAl obtained higher work hardening ability and thereby enhanced strength.
Journal Title: Surface and Coatings Technology
Year Published: 2018
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