Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1499724 | Scripta Materialia | 2011 | 4 Pages |
Abstract
Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was ∼1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
L. Wang, H. Bei, T.L. Li, Y.F. Gao, E.P. George, T.G. Nieh,