The influence of silver on the structure and mechanical properties of (TiAl)-based intermetallics

Abstract

The influence of silver on the structure and mechanical properties of sputter-deposited Ti-ALAg films with an aluminium content close to 48 at.% and 0 < at.% Ag < 3 was investigated. A new tensile test procedure has been developed to evaluate the ductiLity of the films. The results show that the as-deposited films are metastable formed, essentially, by an extended c-u-Ti solid solution. Annealing at 6OO'C gives rise to the formation of y-TN intermetallic compound. Silver does not lead to structural modifications of the TiAl system nor influences significantly its ductility. However, a hardness increase of the as-deposited fihns with silver contents up 10 1.6 at.% is observed. (C 1999 Elsevier Science S.A. All rights reserved.Rewords:

Evolution of the functional properties of titanium–silver thin films for biomedical applications: Influence of in-vacuum annealing

“…This effect also promotes more well-defined microstructures as demonstrated by the SEM analysis, Fig. 4 solutions [16,21,27,39]. Since the neighbouring grains of the film belong to different lattice structures and hence to different phases, the resistance for dislocation movement through the grain boundaries is higher resulting in hardness enhancement [23].…”

“…Given the low concentration of silver in the two representative samples of zone I (0.04 at.% and 0.2 at.%), the energy supplied by the thermal treatments promotes Ag diffusion into the Ti structure, resulting in lattice defects and hence microstrains [18,41]. a h b y h α-Ti phase increases results in some grain refinement (grain boundaries reduction), as discussed above, and leads to what might be called an enhanced solid solution hardening effect [39,48]. This effect also promotes more well-defined microstructures as demonstrated by the SEM analysis, Fig.…”

“…It seems that for higher Ag/Ti atomic ratios the sputtered metastable supersaturated hcp-Ti matrix phase is decomposed, since the Ag diffusion into the hcp Ti promotes distortions in the lattice, which evolves to tetragonal Ti 2 Ag and TiAg intermetallic structures [39]. is too low to develop well-defined Ti-Ag phases.…”

Effect of silver addition in gamma titanium aluminide

“…Further, the pincushion type of indent observed in melt-5/1 and melt-5/5 is evidence of material sinking in and around the indentor, which is typical in annealed metals [8] suggesting that these melts are ductile than the other melt. The increase in hardness, as observed in melt-5/2 to melt-5/4, might be due to silver absorption in the solid solution [9]. …”

From Ti–Al- to Ti–Al–N-sputtered 2D materials

“…TiAl thin films can also be deposited as an interlayer to promote better adhesion between thin films and substrates. This procedure has been successfully used with different nitrides [7] and particularly in TiAlN thin films for cutting tools [8]. Moreover, Ti-Al thin films, which can also be used to join materials, holds special interest for (micro)manufacturing [9].…”