Effects of focused ion beam milling on the nanomechanical behavior of a molybdenum-alloy single crystal

Journal Article · Mon Sep 10 00:00:00 EDT 2007 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2784948· OSTI ID:21016148

Bei, H; Shim, S; Miller, M K; Pharr, G M; George, E P ^[1]

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1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States) and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

Nanoindentation was performed on a Mo-alloy single crystal to investigate effects of focused ion beam (FIB) milling on mechanical behavior. On a non-FIB-milled surface, pop-ins were observed on all load-displacement curves corresponding to a transition from elastic to plastic deformation. Similar pop-ins were not detected on surfaces subjected to FIB milling. This difference indicates that FIB milling introduces damage that obviates the need for dislocation nucleation during subsequent deformation. A second effect of FIB milling is that it increased the surface hardness. Together, these effects could be the source of the size effects reported in the literature on micropillar tests.

• OSTI ID: 21016148
• Journal Information: Applied Physics Letters, Vol. 91, Issue 11; Other Information: DOI: 10.1063/1.2784948; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
DISLOCATIONS
ELASTICITY
HARDNESS
ION BEAMS
MILLING
MOLYBDENUM ALLOYS
MONOCRYSTALS
NUCLEATION
PHASE TRANSFORMATIONS
PLASTICITY
SURFACE PROPERTIES