Mechanical Response of Mesoporous Amorphous NiTi Alloy to External Deformations

TL;DR

This study uses molecular dynamics simulations to analyze how porosity affects the mechanical properties of porous amorphous NiTi alloy, revealing insights into its elastic behavior and potential for metal foam development.

Contribution

It provides new understanding of the mechanical response of porous amorphous NiTi alloy under various deformations using molecular dynamics simulations.

Findings

Porous amorphous NiTi has higher Young's modulus than crystalline form.

Percolated pore networks improve elastic resistance to tension and shear.

Isolated spherical pores increase resistance to compression but decrease resistance to tension and shear.

Abstract

The porous titanium nickelide is very popular in various industries due to unique combination of physical and mechanical properties such as shape memory effect, high corrosion resistance, and biocompatibility. The non-equilibrium molecular dynamics simulation was applied to study the influence of porosity degree on mechanical properties of porous amorphous titanium nickelide at uniaxial tension, uniaxial compression, and uniform shear. We have found that the porous amorphous alloy is characterized by a relatively large value of Young's modulus in comparison to its crystalline analogue. It has been found that the system with a percolated network of pores exhibits improved elastic characteristics associated with resistance to tensile and shear. The system contained isolated spherical pores is more resistant to compression and less resistant to tensile and shear. These results can be applied to develop and improve the methods for making amorphous metal foams.