Yield strength dependence on strain rate of molybdenum-alloy nanofibers

Journal Article · Mon Jun 23 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4885377· OSTI ID:22303848

Loya, P. E.; Peng, C.; Zhang, P.; Zhang, J.; Lou, J. ^[1]; Xia, Y. Z. ^[2]; Bei, H. ^[3]; George, E. P.; Gao, Y. F. ^[2]

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1. Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005 (United States)
2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States)
3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

The yield strength dependence on strain rate was studied for molybdenum-alloy nanofibers with varying initial dislocation density at three different pre-strain levels. In-situ tensile experiments at three displacement rates were carried out in a scanning electron microscope. Yield strength and its scatter decreased as a function of the pre-strain level for different displacement rates. A statistical model was used to analyze the results, and a negative strain rate dependence was inferred from the yield experiments. This finding suggests the need for theoretical investigations since classical models such as dynamic strain aging may have limitations at such nanoscales.

• OSTI ID: 22303848
• Journal Information: Applied Physics Letters, Vol. 104, Issue 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ATOMIC DISPLACEMENTS
DISLOCATIONS
FLUID FLOW
GROUND MOTION
MOLYBDENUM ALLOYS
NANOFIBERS
NANOSTRUCTURES
SCANNING ELECTRON MICROSCOPY
STRAIN AGING
STRAIN RATE
STRAINS
YIELD STRENGTH