A different type of indentation size effect

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2008.07.026· OSTI ID:937530

Shim, Sang Hoon ^[1]; Bei, Hongbin ^[1]; George, Easo P ^[1]; Pharr, George Mathews ^[1]

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1. ORNL

Pop-in during nanoindentation, which indicates the onset of dislocation plasticity, was systematically investigated in annealed and pre-strained single crystals of nickel using spherical indenters with different tip radii. As the indenter radius and pre-strain decrease, the maximum shear stresses determined from the pop-in loads increase. This represents a new type of indentation size effect (ISE), based not on the measured hardness as in conventional ISE, but on the stress needed to initiate dislocation plasticity.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 937530
• Journal Information: Scripta Materialia, Vol. 59, Issue 10; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL
DISLOCATIONS
HARDNESS
MONOCRYSTALS
PLASTICITY
SHEAR
STRESSES