The effect of size on the plastic deformation of annealed cast aluminium microwires

Monocrystalline, cast aluminium microwires of diameter (D) below 25 μm free of micromilling artefacts are annealed under protective atmosphere. Annealing increases the flow stress of all tested microwires, by an amount that is found, in a Haasen plot of measured activation area values, to be an athe...

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Bibliographic Details
Published inScripta materialia Vol. 161; pp. 58 - 61
Main Authors Verheyden, S., Pires Da Veiga, L., Deillon, L., Mortensen, A.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2019
Subjects
Aluminium
Annealing
Monocrystalline
Size effects
Thermal activation
Size effects
Monocrystalline
Annealing
Aluminium
Thermal activation
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Summary:Monocrystalline, cast aluminium microwires of diameter (D) below 25 μm free of micromilling artefacts are annealed under protective atmosphere. Annealing increases the flow stress of all tested microwires, by an amount that is found, in a Haasen plot of measured activation area values, to be an athermal contribution to the flow stress that is attributed to surface oxide layer thickening. Microwires oriented for single slip with D ~14 μm behave as do as-cast microwires with D ~7 μm, showing a transition to higher and more stochastic flow stress values; this effect is attributed to a greater scarcity of dislocation sources after annealing. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.10.009