TY - JOUR

T1 - Stabilization of Ti5Al11 at room temperature in ternary Ti-Al-Me (Me = Au, Pd, Mn, Pt) systems

AU - Lazurenko, D. V.

AU - Dovzhenko, G. D.

AU - Lozanov, V. V.

AU - Petrov, I. Y.

AU - Ogneva, T. S.

AU - Emurlaev, K. I.

AU - Bataev, I. A.

N1 - The study was conducted within the framework of Federal Task of Ministry of Education and Science of the Russian Federation (Project FSUN-2020-0014) “Investigations of Metastable Surfaces and Interfaces under Extreme External Impacts”. The structural research was carried out at core facility "Structure, mechanical and physical properties of materials", NSTU. Synchrotron measurements were implemented at the P07 beamline of German Electron Synchrotron (DESY) in April 2019.

PY - 2023/5/25

Y1 - 2023/5/25

N2 - Ti5Al11 is known as a high-temperature phase in binary Ti-Al alloys. However, its existence at low temperatures was previously observed in ternary Ti-Al-based systems alloyed with some transition metals. In this study, we systematically evaluated Ti-Al-Me ternary systems (Me = Au, Pd, Mn, or Pt) to determine the influence of transition elements on low-temperature stabilization of Ti5Al11 phase. The temperature ranges in which Ti5Al11 existed in Ti-Al-Me systems were experimentally found using in situ synchrotron X-ray diffraction (SXRD). It was established that addition of Mn and Pt retains Ti5Al11 at room temperature. The obtained data were compared with predictions of density functional theory (DFT). The total energy, volume, and bond length are especially significantly reduced by addition of Mn and Pt. Ti5Al11 compound containing both of these elements is less prone to saturation with Ti upon preserving the lattice tetragonality and suppressing Ti5Al11 → TiAl transformation. These factors finally contribute to the retention of this phase at room temperature.

AB - Ti5Al11 is known as a high-temperature phase in binary Ti-Al alloys. However, its existence at low temperatures was previously observed in ternary Ti-Al-based systems alloyed with some transition metals. In this study, we systematically evaluated Ti-Al-Me ternary systems (Me = Au, Pd, Mn, or Pt) to determine the influence of transition elements on low-temperature stabilization of Ti5Al11 phase. The temperature ranges in which Ti5Al11 existed in Ti-Al-Me systems were experimentally found using in situ synchrotron X-ray diffraction (SXRD). It was established that addition of Mn and Pt retains Ti5Al11 at room temperature. The obtained data were compared with predictions of density functional theory (DFT). The total energy, volume, and bond length are especially significantly reduced by addition of Mn and Pt. Ti5Al11 compound containing both of these elements is less prone to saturation with Ti upon preserving the lattice tetragonality and suppressing Ti5Al11 → TiAl transformation. These factors finally contribute to the retention of this phase at room temperature.

KW - Alloying

KW - DFT calculations

KW - Phase stability

KW - Titanium aluminides

KW - X-ray synchrotron radiation diffraction

UR - https://www.scopus.com/inward/record.url?eid=2-s2.0-85147911805&partnerID=40&md5=096fb7498fc8017e44e7a4031f0e63f3

UR - https://www.mendeley.com/catalogue/1a09e358-43e5-38c9-80bb-8506c8109de8/

U2 - 10.1016/j.jallcom.2023.169244

DO - 10.1016/j.jallcom.2023.169244

M3 - Article

VL - 944

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 169244

ER -