Evaluating plastic flow properties by characterizing indentation size effect using a sharp indenter

✍ Scribed by Ju-Young Kim; Seung-Kyun Kang; Julia R. Greer; Dongil Kwon

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 204 KB
• Volume: 56
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.02.049

✦ Synopsis

The strain-hardening exponent, used in describing the plastic flow properties of materials, is evaluated from the characteristic length in the indentation size effect (ISE). A linear relationship is found between the strain-hardening exponent and the log of the ISE characteristic length for Ni and SCM21 (structural steel) samples with different plastic pre-strain values. These results are explained through the Taylor dislocation hardening model and a representative stress-strain approach. A dimensionless function characterizing the plastic deformation using only parameters generally measurable by nanoindentation testing is also proposed. The feasibility of developing a unique dimensionless function is studied for 22 metals.