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- Title
Plasticity initiation and subsequent deformation behavior in the vicinity of single grain boundary investigated through nanoindentation technique.
- Authors
Ohmura, Takahito; Tsuzaki, Kaneaki
- Abstract
The initiation of plasticity and the subsequent state in the vicinity of a single grain boundary during indentation-induced deformation were investigated to understand an elementary step of a stress-strain behavior of polycrystalline materials. Nanoindentation measurements on several points on a single grain boundary and the grain interior of an interstitial-free steel and an analysis on the pop-in behavior and the plastic nanohardness were carried out. The pop-in load P c that was obtained on the loading curve is different for each measurement. However, the loading curves overlap one another and the unloading curves coincide as well after the pop-in event. The nanohardness Hn has no dependence on the P c in the range of 150–550 μN. The relation between P c and Δh can be expressed as a simple cubic polynomial function based on a geometrically necessary dislocation loop model. The fitted function differed for various grains with different crystallographic orientations.
- Subjects
NANOSTRUCTURED materials; MATERIAL plasticity; CRYSTAL grain boundaries; STRESS-strain curves; CRYSTALLOGRAPHY; DEFORMATION potential
- Publication
Journal of Materials Science, 2007, Vol 42, Issue 5, p1728
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-0885-y