Fizika Nizkikh Temperatur: Volume 43, Number 9 (September 2017), p. 1400-1404    ( to contents , go back )

Instability of the plastic flow of nanocrystalline titanium at low temperatures

R.V. Smolianets and V.A. Moskalenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: smoljanets@ilt.kharkov.ua

Received February 21, 2017, revised March 1, 2017

Abstract

The effect of grain size variation from micrometer-to nano-scale values on the localization of the plastic flow of titanium under quasi-static tension at low temperatures was studied. The influence of the strain hardening rate, true stress and its strain rate sensitivity on the sharp decrease in uniform strain during tension of nanocrystalline titanium was determined. An increase in ductility is favored by the introduction of a grain fraction with submicron grains into the nanocrystalline matrix (the creation of a bimodal structure). The effect is enhanced at low temperatures as a result of activation of twinning in larger grains.

62.25.–g Mechanical properties of nanoscale systems;
PACS: 62.20.F– Deformation and plasticity.

Key words: Nanocrystalline titanium, instability plastic flow, low temperatures.

Published online: July 25, 2017

Download 477584 byte View Contents

 
 
Copyright © ILTPE. . All rights reserved.
ISSN: 0132-6414 (Print) | ISSN: 1816-0328 (Online)