A different type of indentation size effect

Journal Article · Tue Jan 01 04:00:00 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 Laboratory (ORNL); High Temperature Materials Laboratory
• Sponsoring Organization: EE USDOE - Office of Energy Efficiency and Renewable Energy (EE); SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 937530
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 59; ISSN SCMAF7; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DISLOCATIONS
HARDNESS
MONOCRYSTALS
NICKEL
PLASTICITY
SHEAR
STRESSES