Hall-Petch description of nanopolycrystalline Cu, Ni and Al strength levels and strain rate sensitivities

Strength and strain rate sensitivity measurements for nanopolycrystalline copper, nickel and aluminium materials are assessed on the basis of a Hall-Petch method of analysis. The H-P k ε values are attributed to the need for cross-slip in the grain boundary regions. Transition of the H-P dependence...

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Bibliographic Details
Published inPhilosophical magazine (Abingdon, England) Vol. 96; no. 29; pp. 3097 - 3108
Main Author Armstrong, R. W.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 12.10.2016
Subjects
aluminium
Aluminum
Copper
Dislocation loops
dislocation mechanics
Grain boundaries
nanometals
Nanostructure
Nickel
STRAIN RATE
STRAIN RATE SENSITIVITY
Strength
Strengthening mechanisms
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Summary:Strength and strain rate sensitivity measurements for nanopolycrystalline copper, nickel and aluminium materials are assessed on the basis of a Hall-Petch method of analysis. The H-P k ε values are attributed to the need for cross-slip in the grain boundary regions. Transition of the H-P dependence to the stress for a single dislocation loop expanding against the grain boundary resistance provides an explanation of higher measurements for nanoscale aluminium material.
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ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2016.1225168