Article ID Journal Published Year Pages File Type
1449919 Acta Materialia 2007 9 Pages PDF
Abstract

The conventionally produced Ti50Ni50−xCux shape memory alloys with Cu-content exceeding 12 at.% have been reported to be brittle. The authors have recently reported that, after being properly annealed, the Ti50Ni25Cu25 melt-spun ribbon exhibits excellent superelasticity and shape memory effect. The present research aims to elucidate why these beneficial properties come about by investigating the evolution of microstructures and textures as a function of the annealing condition. It is found that annealing at 500 °C and above results in the formation of a strong (111)[7¯15]B19 sheet texture that is favorable to martensite detwinning, while with annealing at 550 °C and above the formation of B11 precipitates becomes significant. These two factors are believed to play key roles in determining the properties of the ribbon.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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