Initial Stages of Yield in Nanoindentation

Journal Article · Tue Nov 24 00:00:00 EST 1998 · Journal of Materials Research

OSTI ID:2001

Houston, J E; Jarausch, K F; Kiely, J D; Russell, P E

We have used the Interracial Force Microscope" to perform nanoindentations on Au single- crystal surfaces. We have observed two distinct regimes of plastic deformation which are distinguished by the magnitude of discontinuities in load relaxation. At lower stresses, relaxation occurs in small deviations from elastic behavior, while at the higher stresses they take the form of large load drops often resulting in complete relaxation of the applied load. These major events create a relatively wide plastic zone that subsequently deepens more rapidly than it widens. We discuss these findings in terms of contrasting models of dislocation processes in the two regimes.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 2001
• Report Number(s): SAND98-2632J; ON: DE00002001
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
Monocrystals
Gold
Plasticity