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  4. The effect of size, orientation and temperature on the deformation of microcast silver crystals
 
research article

The effect of size, orientation and temperature on the deformation of microcast silver crystals

Borasi, Luciano  
•
Frasca, Simone  
•
Charbon, Edoardo  
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March 10, 2023
Acta Materialia

Monocrystalline microwires of silver are produced by means of a novel casting process that combines precise mold production by silicon microfabrication with molten metal pressure infiltration. The wires have a shape amenable to tensile testing and a diameter from a few to several tens of micrometer. Displacement-controlled in -situ tensile tests are conducted at room-temperature, 200 degrees C and 400 degrees C. Data are compared with bulk coun-terparts of the same silver cast to have a diameter near 1 mm. Results show clear evidence of small-scale plasticity. The influence of size, crystal orientation, and temperature on the deformation, yield, strain burst statistics and strain hardening of these micrometric dense metal samples is analyzed. Yield stress values agree with the single arm source model provided that the density of forest dislocations comprises a scale-dependent component likely resulting from thermal mismatch stresses. Statistics of strain burst amplitudes agree with an exponentially truncated power-law complementary cumulative distribution. The power-law exponent agrees with predictions of mean-field theory, while the cutoff intensity exhibits no visible dependence on sample diameter or test temperature and agrees with predictions of current theory.

  • Details
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Type
research article
DOI
10.1016/j.actamat.2023.118817
Web of Science ID

WOS:000954980000001

Author(s)
Borasi, Luciano  
Frasca, Simone  
Charbon, Edoardo  
Mortensen, Andreas  
Date Issued

2023-03-10

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

Published in
Acta Materialia
Volume

249

Article Number

118817

Subjects

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

•

Materials Science

•

Metallurgy & Metallurgical Engineering

•

plasticity size effect

•

temperature

•

silver

•

intermittent plasticity

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single-crystals

•

dislocation avalanches

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plastic-deformation

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strain bursts

•

strength

•

behavior

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scale

•

mechanisms

•

flow

•

cu

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMM  
Available on Infoscience
April 24, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/197045
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