The crystal structure, microhardness and thermal stability of the Ti26Al55Zn19 alloy

Experimental investigation and thermodynamic optimization of the Al–Zn–Ti system in the Al-rich corner

“…Single seTi 27 Al 28 Zn 45 phase was found in the #5 sample, and the diffraction peaks were well consistent with that characteristic peaks determined in our previous work [16]. All the results were summarized and listed in Table 1.…”

“…Krajewski [31] studied the atom site preference in TiZn 3 -based trialuminides using H. Rietveld method, and found that Zn was replaced by Al during the transformation from TiZn 3 to Ti(Al,Zn) 3 . In our previous work [16], the existence of the seTi 26 Al 55 Zn 19 phase has been confirmed by Zn/TiAl 3 diffusion couple at 400 C. The crystal structure and thermal stability of the seTi 26 Al 55 Zn 19 alloy were experimentally determined. Then the phase equilibria of the AleZneTi system in Al-rich corner at 400 C were experimentally investigated through equilibrated alloys [17].…”

“…However, the previous HRXRD pattern and HRTEM results [16] suggest that a quantity of disorder phase exists in the alloy. According to the solubilities of Al, Zn and Ti in ternary phase s phase [16,17,26,29], the s phase is The experimental data of phase equilibria at 400 C [17] and 500 C as well as the diffusion couple results at 400 C [16] were used to assess the AleZneTi system. There were four obvious layers existed in the diffusion couple from pure Zn to TiAl 3 .…”

“…Because of the solubility of Zn is about 0.8 at.% in TiAl 3 at 500 C, the sublattice formula proposed for TiAl 3 The structure of the ternary phase s has been determined as an L1 2 structure with Ti occupying (0, 0, 0) position and both Al and Zn occupying (0, 0.5, 0.5) position [16]. However, the previous HRXRD pattern and HRTEM results [16] suggest that a quantity of disorder phase exists in the alloy.…”

“…The crystal structure of the new seTi 26 Al 55 Zn 19 had been analyzed in our previous work [16]. The phase equilibria of the AleZneTi system in the Al-rich corner at 400 C had been experimentally investigated [17].…”