Unusual effect of high pressures on phase transformations in Ni${}_{62}$Nb${}_{38}$ alloy

Abstract

Binary Ni${}_{62}$Nb${}_{38}$ alloy belongs to the unique class of binary off-eutectic systems, which are able to form a bulk glassy state [L. Xia et al., J. Appl. Phys. 99 (2006) 026103]. In the present work, the ($p$, $T$) phase diagram of Ni${}_{62}$Nb${}_{38}$ alloy was first determined for a wide thermodynamic range with temperatures from $300$\,K to $6000$\,K and with pressures from $1$\,atm to $1.2\times 10^7$\,atm. For this thermodynamic range, elements of the phase diagram such as the liquid-crystal coexistence line and the glass transition line are defined. Our results reveal good agreement between the simulation results and the known experimental values of the liquidus temperature and the glass transition temperature for the isobar $p=1$\,atm. The phase diagram is detailed for pressures greater than $1\times 10^7$\,atm. For the first time, the phase separation conditions at which the liquid Nb and crystalline Ni phases coexist in the system were determined.

12 pages, 4 figures, 1 table

References in corpus (5)

• Phase separation of a supersaturated nanocrystalline Cu Co alloy and its influence on thermal stability
• Mechanical Response of Mesoporous Amorphous NiTi Alloy to External Deformations
• Direct evaluation of attachment and detachment rate factors of atoms in crystallizing supercooled liquids
• Excellent glass former Ni${}_{62}$Nb${}_{38}$ crystallizing under combined shear and ultra-high pressure
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Cited by in corpus (1)

• Machine learning-based prediction of elastic properties of amorphous metal alloys