In-situ investigation of dynamic deformation in NiTi shape memory alloys under laser induced shock

Functionally graded NiTi shape memory alloys

In this study, in order to obtain a functionally graded material, NiTi strips were annealed at 350°C, 450°C and 550°C in a furnace using an assembly that allowed a temperature gradient along them, and their transformation temperatures were studied by Differential Scanning Calorimetry (DSC). Furthermore, the strips were bent at both ends and dipped into a water bath at room temperature which was...

Atomistic study of nanotwins in NiTi shape memory alloys

Atomistic simulations are performed to study the structure and geometrical limit of nanoscale twins in NiTi shape memory alloys. We analyze compound twins as narrow as 1 nm, involving a few atomic layers. A novel nanotwinned structure is found, forming through the martensitic transformation of sublattices. We predict the temperatures of phase transformation, which are consistent with experiment...

NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

Xenon Focused Ion Beam in the Shape Memory Alloys Investigation – The Case of NiTi and CoNiAl

The presented article reviews the first experiences with the xenon plasma focused ion beam (FIB) in the scanning electron microscope (SEM) applied on the investigations of shape memory alloys (SMAs). The SMA are the focus of investigation in our department for many years and these investigated alloys are examples of material prepared by novel spark plasma sintering method (NiTi) and traditional...

Characterization of smart MARFOS NiTi shape memory alloys

In the present study, structural characterization of NiTi smart shape memory alloys (SMAs), produced by an alternative powder metallurgy approach named mechanically activated reactive forging (MARFOS), was carried out by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was observed that MARFOS materials had a multiphase nanocrys...