• Wiśniewski, Tomasz
• Przybysz, Mariusz
• Kubiś, Michał
• Kulczyk, Mariusz
• Pachla, Wacław
• Smalc-Koziorowska, Julia
• Skiba, Jacek
• Wróblewska, Monika

Abstract

A vital problem faced in the implant logical practice is the heat generated due to friction unavoidable during surgical interventions. The proliferation of heat through the implant results in an increase of temperature above the immunological ability of the human tissues. In present study the mechanical, structural, and thermo-physical properties of titanium CP Ti grade 2 and 316L stainless steel processed by hydrostatic extrusion (HE) are analyzed and discussed. Effect of severe plastic deformation on the thermo-physical properties is presented. In both the materials the structures obtained were of nanometric scale with an average grain size of 80 nm in 316L steel and 95 nm in CP Ti grade 2. After HE, the strength and yield stress increased, with respect to those of the as-received material, respectively by 160% and 300% in steel, and 86% and 120% in titanium. The thermal diffusivity decreased by 8.5% in steel and by 7.5% in titanium, and the specific heat by 8.55% in steel and 4.5% in titanium, resulting in 12-13% decrease of thermal conductivity. All changes were attributed to nanostructure generated during severe plastic deformation by hydrostatic extrusion. The reduced thermo-physical properties widen the possibilities for bioengineering applications of both materials.

Topics

• impedance spectroscopy
• polymer
• grain
• stainless steel
• grain size
• strength
• titanium
• diffusivity
• thermal conductivity
• specific heat
• hydrostatic extrusion