Liquidus Projection of the Ni-Sc-Zr System

• Published in: Journal of phase equilibria and diffusion Vol. 43; no. 2; pp. 109 - 125
• Main Authors: Jiang, Shuwen, Tang, Wenjian, Wang, Yao, Huang, Dandan
• Format: Journal Article
• Language: English
• Published: New York Springer US 2022; Springer Nature B.V
• Subjects: Body centered cubic lattice; Casting alloys; Ceramics; Composites; Crystallography and Scattering Methods; Engineering Thermodynamics; Eutectic reactions; Face centered cubic lattice; Glass; Heat and Mass Transfer; Intermetallic phases; Invariants; Liquidus; Metallic Materials; Natural Materials; Physics; Physics and Astronomy; Projection; Scandium; Solidification; Ternary systems; Thermodynamics; Zirconium; Ni-Sc-Zr; microstructure; liquidus projection; solidification
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-022-00946-9

In this work, the liquidus projection of the Ni-Sc-Zr ternary system has been experimentally investigated using forty-three as-cast alloys for the first time. The determination of primary phase regions, solidification paths and invariant reaction temperatures has been made based on microstructural characterization via scanning electron microscopy (SEM) with energy-dispersive spectrometer (EDS) and Differential Scanning Calorimeter (DSC). In the constructed liquidus projection, up to fifteen primary solidification phases, including BCC_A2, HCP_A3, Sc 2 Ni, NiZr 2 , BCC_B2, NiZr, Ni 10 Zr 7 , Ni 21 Zr 8 , Ni 11 Zr 9 , ScNi 2 , Ni 7 Zr 2 , Sc 2 Ni 7 , ScNi 5 , Ni 5 Zr and FCC_A1, were observed. Among these the ordered BCC_B2 phase forms the dominant primary solidification field while the Sc 2 Ni and HCP_A3 phase regions are described to expand deeply into the ternary system. In addition, a ternary eutectic reaction and seven ternary transition reactions are proposed as invariant reactions.