Single versus successive pop-in modes in nanoindentation tests of single crystals

Xia, Yuzhi; Gao, Yanfei; Pharr, George M.; Bei, Hongbin

doi:10.1557/jmr.2016.193

Single versus successive pop-in modes in nanoindentation tests of single crystals

Journal Article · Tue May 24 00:00:00 EDT 2016 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2016.193· OSTI ID:1324059

Xia, Yuzhi ^[1]; Gao, Yanfei ^[2]; Pharr, George M. ^[2]; Bei, Hongbin ^[3]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

From recent nanoindentation experiments, two types of pop-in modes have been identified: a single pop-in with a large displacement excursion, or a number of pop-ins with comparable and small displacement excursions. Theoretical analyses are developed here to study the roles played by indenter tip radius, pre-existing defect density, heterogeneous nucleation source type, and lattice resistance on the pop-in modes. The evolution of dislocation structures in earlier pop-ins provides input to modeling a stochastic, heterogeneous mechanism that may be responsible for the subsequent pop-ins. It is found that when the first pop-in occurs near theoretical shear stress, the pop-in mode is determined by the lattice resistance and tip radius. When the first pop-in occurs at low shear stress, whether the successive pop-in mode occurs depends on how the heterogeneous dislocation nucleation source density increases as compared to the increase of the total dislocation density. Lastly, the above transitions are found to correlate well with the ratio of indenter tip radius to the mean spacing of dislocation nucleation sources.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324059

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 14 Vol. 31; ISSN 0884-2914; ISSN applab

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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