Stress exponent investigation of beta-Sn single crystal by depth-sensing indentation tests

Sahin O., Uzun O., Koelemen U., Ucar N.

PHYSICA B-CONDENSED MATTER, vol.396, no.1-2, pp.87-90, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 396 Issue: 1-2
  • Publication Date: 2007
  • Doi Number: 10.1016/j.physb.2007.03.015
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.87-90
  • Keywords: stress exponent, creep, beta-Sn single crystal, depth-sensing indentation test, CREEP-BEHAVIOR, HARDNESS
  • Yozgat Bozok University Affiliated: No


Depth-Sensing Indentation tests with different loading rates were performed on beta-Sn single crystal. It was found that variations in indentation load-depth curves were significantly related to loading rates. The creep penetration depths increased with increasing loading rates, although the maximum load and holding time used were the same. Higher loading rates caused larger creep deformation at the same hold time (300s), as well as larger hardness value. Creep indentation hardness, H, defined from the concept of "work of indentation" varied with the volume strain occurring during the creep hold time, which is a measure of creep strain rate. Thus, strain rate sensitivity n of the indented material was determined from In H vs. In curve. Our results revealed that hardness was linearly dependent on strain rate. (c) 2007 Elsevier B.N. All rights reserved.