Amorphous Ni50Ti50 Alloy with Nanoporous Structure Generated by Ultrafast Isobaric Cooling

TL;DR

This study uses atomistic simulations to explore how ultrafast cooling influences pore formation in amorphous Ni50Ti50 alloy, revealing that porosity remains unaffected by cooling rate but pore morphology varies.

Contribution

It demonstrates the effect of ultrafast isobaric cooling on pore morphology in amorphous Ni50Ti50 alloy, providing insights for designing metallic foams with specific properties.

Findings

Porosity is independent of cooling rate.

Pore morphology depends on cooling rate.

Vaporization temperature and equation of state are determined.

Abstract

Amorphous metallic foams are prospective materials due to unique combination of their mechanical and energy-absorption properties. In the present work, atomistic dynamics simulations are performed under isobaric conditions with the pressure $p = 1.0$ atm in order to study how cooling with extremely high rates ($5\times10^{13}$--$5\times10^{14}$ K/s) affects the formation of pores in amorphous titanium nickelide. For equilibrium liquid phase, vaporization temperature $T_{b}$ and the equation of states in the form of $\rho(T)$ are determined. It is found that the porosity of this amorphous solid does not depend on cooling at such high rates, whereas the pore morphology depends on the magnitude of the cooling rate. The obtained results will be in demand in study of mechanical properties of amorphous metallic foams with a nanoporous structure.