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Title: Yield strength dependence on strain rate of molybdenum-alloy nanofibers

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.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ; ;  [2] ;  [4]
  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)
  4. (United States)
Publication Date:
OSTI Identifier:
22303848
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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