Modulus and hardness evaluation of polycrystalline superconductors by dynamic microindentation technique


Uzun O., Kolemen U. , Celebi S., Guclu N.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol.25, no.6, pp.969-977, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 6
  • Publication Date: 2005
  • Doi Number: 10.1016/j.jeurceramsoc.2004.03.031
  • Title of Journal : JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • Page Numbers: pp.969-977
  • Keywords: indentation, hardness, elastic modulus, superconductors, YBCO, SINGLE-CRYSTALS, YOUNGS MODULUS, LOAD

Abstract

In this study, depth-sensing Vickers indentation tests were conducted on polycrystalline superconductors under different peak load (0.49, 0.73, 0.98, and 1.22 N). The load (P)-penetration depth (h) curves were analyzed in order to evaluate the mechanical characteristics such as microhardness and elastic modulus. It was found that both of these characteristics exhibited significant peak load dependence which suggested a need for calculation of the load-independent hardness and modulus. The load independent hardness (0.88, 0.95, and 1.12 GPa) and modulus (1.98, 3.13, and 3.33 GPa) values were then calculated for YBCO, YBCO + 0.5% ZnO, and YBCO + 1% ZnO, respectively. (c) 2004 Elsevier Ltd. All rights reserved.