Site preference of ternary alloying additions to AuTi

Shape-memory NiTi with two-dimensional networks of micro-channels

“…3d, the Fe and Ni compositions (from quantitative EDX measurements) in sample HP produced with uncarburized meshes are plotted together with a Fe line scan (from Fig. 3b), showing that Fe replaces Ni in the NiTi lattice, as previously documented in bulk NiTi [58,59]. Thus the (Ni, Fe)Ti material adjacent to the channel wall is Ni depleted as compared to the original NiTi.…”

Phase structure and site preference behavior of ternary alloying additions to PdTi and PtTi shape-memory alloys

“…In what follows, the different alloying additions are grouped based on the magnitude of the energy gap between different substitutional defects. As seen in a previous study of alloying additions X to NiTi alloys [25], it is also important to consider the effect of increasing concentrations of the solute, which could lead in some cases to different conclusions regarding site preference than those obtained from the behavior of a single atom. To confirm the trends established with increasing solute concentration and in order to verify their effect in situations that better resemble realistic conditions including finite temperature, we utilize large scale Monte Carlo simulations.…”

Shape memory characteristics of Ti49.5Ni25Pd25Sc0.5 high-temperature shape memory alloy after severe plastic deformation

“…Improvements in the shape memory properties of a Ti 50.5 Ni 24.5 Pd 25 alloy after 0.5 at.% Sc addition have previously been shown [11]. Sc was initially chosen as an alloying addition based on the results of atomistic simulations of quaternary additions to TiNiPd, similar to previous work by Bozzolo et al for ternary additions to NiTi [31] and PdTi and PtTi [32]. Scandium was expected to have a wide range of solubility in TiNiPd, have a positive influence on the bond strength through an increase in the formation energy of the alloy, and increase the lattice strain, making it a potent solid solution strengthener.…”