Functional Properties of Wires and Thin Ribbons of Several Shape Memory Alloys

Abstract

The so‐called two‐way shape memory effect could be very attractive for technical applications. This work deals with the generation of a two‐way shape memory effect and its optimization in NiTi, NiTiW and CuAlNi wire material. Moreover, thin ribbons of CuAlNi have been produced by melt‐spinning to investigate the shape memory behaviour of small parts for possible applications as microsensors and microactuators.

Numerical Modelling of Kinking in Lamellar γ‐TiAl Based Alloys

“…Initially, as structural stability teaches, imperfections similar to the eigenmodes are triggered, and these are kink modes [8], [9] which could occur also in a perfect structure on load levels depending on the material properties. [16] Finally this kink mode type imperfection patterns trigger the development of band-like shear concentration zones due to their geometrical relationship. It should be emphasized that all deformation modes are operative in a strongly geometrically non-linear regime and can actually not be separated.…”

Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

“…None of the above processing studies pertains specifically to SMAs, and published efforts on direct casting of Cu-based SMAs are mostly limited to melt spinning of millimeter-wide ribbons [9][10][11][12][13][14][15][16][17], with the exception of a few reports on INROWASP round SMA fibers [3,18]. Almost all of these studies rely on the addition of grain refiners such as titanium, boron, zirconium and chromium to increase the strength of the cast alloy material.…”

Response of monocyte-derived dendritic cells to rapidly solidified nickel-titanium ribbons with shape memory properties

“…In our previous papers (Kneissl et al, 2006;Mehrabi et al, 2009) we described the process of Rapid Solidifi cation by melt spinning and its infl uence on the microstructure and improvement of the shape memory properties of Ni-Ti SMAs. Since the surface of an alloy is the predominant factor determining the outcome of any material-to-cell interaction (Shabalovskaya, 2002), in this work we investigated for the fi rst time the surface of Ni-Ti RS ribbons aiming to understand its biological effects.…”