• High quality Ti 47 Ni 53 alloy is fabricated by the SLM for first time. The microstructure of SLM-Ti has been systemically studied. Compressive deformation behavior explored in-situ HE-XRD. Synergy relationship between transforming matrix and elastic 4 3 revealed. This work a favorable reference preparing other high content TiNi alloys. alloys with (52–55 at.%) are perfectly suitable wear- co...

In this paper, we present a new nerve cuff electrode based on a shape memory alloy (SMA) armature. This device is dedicated to functional electrical stimulation of the bladder in spinal cord injured patients. The SMA armature performs the closing of the electrode, making its installation around the nerve much easier, quicker and safer. Both remarkable mechanical properties of SlvIA materials na...

T his is the third paper in our series to identify unusual phenomena and to provide recommendations for the thermo-mechanical characterization of shape memory alloy (SMA) wire. Part 1 provided some basic background of the martensitic transformations responsible for the shape memory effect and superelasticity1. The characterization of two typical NiTi SMA alloys began with differential scanning ...

Martensitic transformation usually creates hierarchical internal structures beyond mere change of the atomic crystal structure. Multi-stage nucleation is thus required, where nucleation (level-1) of the underlying atomic crystal lattice does not have to be immediately followed by the nucleation of higher-order superstructures (level-2 and above), such as polysynthetic laths. Using in situ trans...

The study focuses on the superelastic effect in single-crystalline boron-doped Fe-based shape memory alloys. homogenized and quenched single crystals were subjected to a heat treatment at 973 K for variable aging times. As result, small coherent nanometer-sized γ′ (Ni 3 Al-type) precipitates formed. It was established that Fe-28Ni-17Co-11.5Al-2.5Ta-0.05B oriented along [001] direction exhibit f...

Tensile tests were carlied out on con~mercialty available NiTi alloys in order to study their mechamcal d~aracterirtics up to tlie onsct of thc superelasticity effect. Two realtimc supporting techniques, adiabatic thermal emission and acoustic emission, were employed. Thermal ekssion allowed to follow local temperature variations in the material due to loading, while acoustic emission was able ...