Experimental investigation and thermodynamic calculation of Ni–Al–La ternary system in nickel-rich region: A new intermetallic compound Ni2AlLa

LIAO, Jinfa, WANG, Hang and CHEN, Tzu-Yu (2018). Experimental investigation and thermodynamic calculation of Ni–Al–La ternary system in nickel-rich region: A new intermetallic compound Ni2AlLa. Materials, 11 (12), p. 2396.

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Official URL: https://www.mdpi.com/1996-1944/11/12/2396
Open Access URL: https://www.mdpi.com/1996-1944/11/12/2396/pdf (Published version)
Link to published version:: https://doi.org/10.3390/ma11122396

Abstract

The phase equilibrium of the Ni–Al–La ternary system in a nickel-rich region was observed at 800 °C and 1000 °C using scanning electron microscopy backscattered electron imaging, energy dispersive X-ray spectrometry and X-ray diffractometry. The solubility of Al in the Ni5La phase was remeasured at 800 °C and 1000 °C. Herein, we report a new ternary phase, termed Ni2AlLa, confirmed at 800 °C. Its X-ray diffraction (XRD) pattern was indexed and space group determined using Total Pattern Solution (TOPAS), and the suitable lattice parameters were fitted using the Pawley method and selected-area electron diffraction. Ni2AlLa crystallizes in the trigonal system with a space group R3 (no. 146), a = 4.1985 Å and c = 13.6626 Å. A self-consistent set of thermodynamic parameters for the Al–La and Ni–La binary systems and the Ni–Al–La ternary system includes a Ni2AlLa ternary phase, which was optimized using the CALPHAD method. The calculated thermodynamic and phase-equilibria data for the binary and ternary systems are consistent with the literature and measured data.

Item Type: Article
Uncontrolled Keywords: 03 Chemical Sciences; 09 Engineering
Identification Number: https://doi.org/10.3390/ma11122396
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 23 Jan 2019 16:00
Last Modified: 23 Jan 2019 16:00
URI: http://shura.shu.ac.uk/id/eprint/23551

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