High-temperature site preference and atomic short-range ordering characteristics of ternary alloying elements in gamma '-Ni3Al intermetallics

Date

2017-01-01

Author

Eriş, Rasim
Mehrabov, Amdulla
Akdeniz, Mahmut Vedat

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

118
views

0
downloads

Remarkable high-temperature mechanical properties of nickel-based superalloys are correlated with the arrangement of ternary alloying elements in L1(2)-type-ordered. gamma '-Ni3Al intermetallics. In the current study, therefore, hightemperature site occupancy preference and energeticstructural characteristics of atomic short-range ordering (SRO) of ternary alloying X elements (X = Mo, W, Ta, Hf, Re, Ru, Pt or Co) in gamma '-Ni3Al 21.875 X 3.125 alloy systems have been studied by combining the statistico-thermodynamical theory of ordering and electronic theory of alloys in the pseudopotential approximation. Temperature dependence of site occupancy tendencies of alloying X element atoms has been predicted by calculating partial ordering energies and SRO parameters of Ni-Al, Ni-X and Al-X atomic pairs. It is shown that, all ternary alloying element atoms (except Pt) tend to occupy Al, whereas Pt atoms prefer to substitute for Ni sub-lattice sites of Ni 3 Al intermetallics. However, in contrast to other X elements, sublattice site occupancy characteristics of Re atoms appear to be both temperature-and composition-dependent. Theoretical calculations reveal that site occupancy preference of Re atoms switches from Al to both Ni and Al sites at critical temperatures, T c, for Re > 2.35 at%. Distribution of Re atoms at both Ni and Al sub-lattice sites above T c may lead to localised supersaturation of the parent gamma '-Ni3Al phase and makes possible the formation of topologically close-packed (TCP) phases. The results of the current theoretical and simulation study are consistent with other theoretical and experimental investigations published in the literature.

Subject Keywords

Condensed Matter Physics

URI

https://hdl.handle.net/11511/46335

Journal

PHILOSOPHICAL MAGAZINE

DOI

https://doi.org/10.1080/14786435.2017.1344787

Collections

Test and Measurement Center In advanced Technologies (MERKEZ LABORATUVARI), Article

Suggestions

OpenMETU
Core

Influence of mutual drag of the carrier-phonon system on the thermopower and transverse Nernst-Ettingshausen effect Babaev, MM; Gassym, TM; Tas, M; Tomak, Mehmet (American Physical Society (APS), 2003-03-15) The thermopower and Nernst-Ettingshausen (NE) effect in degenerate semiconductors and semimetals placed in high electric and magnetic fields are calculated by taking into account the heating of both electrons and phonons as well as their thermal and mutual drags. The magnetic and electric field dependences of the thermoelectric power and the transverse NE voltage are found in analytical forms. It is shown that in weak and high transverse magnetic fields, the electronic and phonon parts of the NE coefficient...
Short-range correlations in a one-dimensional electron gas Tas, M; Tomak, Mehmet (American Physical Society (APS), 2003-06-15) We use the Singwi-Sjolander-Tosi-Land (SSTL) approximation to investigate the short-range correlations in a one-dimensional electron gas. We find out that the SSTL approximation satisfies the compressibility sum rule somewhat better than the more widely used Singwi-Tosi-Land-Sjolander approximation in the case of a one-dimensional electron gas.
Numerical evidence of spontaneous division of dissipative solitons in a planar gas discharge-semiconductor system Rafatov, İsmail (AIP Publishing, 2019-09-01) This work deals with the formation of patterns of spatially localized solitary objects in a planar semiconductor gas-discharge system with a high Ohmic electrode. These objects, known as dissipative solitons, are generated in this system in the form of self-organized current filaments, which develop from the homogeneous stationary state by the Turing bifurcation. The numerical model reveals, for the first time, evidence of spontaneous division of the current filaments in this system, similar to that observe...
First-principles studies of Tin+1SiN(n) (n=1, 2, 3) MAX phase Surucu, Gokhan; Güllü, Hasan Hüseyin; CANDAN, ABDULLAH; YILDIZ, BUĞRA; Erkisi, Aytac (Informa UK Limited, 2020-09-01) In this study, the structural, electronic, mechanical, lattice dynamical and thermodynamic characteristics of ( 1, 2 and 3) phase compounds were investigated using the first principle calculations. These ternary nitride compounds were found to be stable and synthesisable, and the results on the stability nature of them were also evaluated for the possible and phases. -was found to be the most stable one among these new class of layered phases for which limited works are available in the literature. The band...
The electronic and elasticity properties of new half-metallic chalcogenides Cu(3)TMCh(4) (TM = Cr, Fe and Ch = S, Se, Te): an ab initio study ERKİŞİ, AYTAÇ; SÜRÜCÜ, GÖKHAN (Informa UK Limited, 2019-02-16) The ternary copper-based chalcogenides Cu(3)TMCh(4) (TM = Cr, Fe and Ch = S, Se, Te), which have simple cubic (SC) crystal structure and conform to space group with 215 space number, have been investigated by spin-polarised generalised gradient approximation (GGA) in the framework of density functional theory (DFT). All systems have been considered in ferromagnetic (FM) order. The mechanical and thermal properties and the electronic band structures of these systems have been investigated after the well-opti...

Citation Formats

R. Eriş, A. Mehrabov, and M. V. Akdeniz, “High-temperature site preference and atomic short-range ordering characteristics of ternary alloying elements in gamma ’-Ni3Al intermetallics,” PHILOSOPHICAL MAGAZINE, pp. 2615–2631, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46335.