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

Monocrystalline, cast aluminium microwires of diameter (D) below 25 mu m 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 similar to 14 mu m behave as do as-cast microwires with D similar to 7 mu m, showing a transition to higher and more stochastic flow stress values; this effect is attributed to a greater scarcity of dislocation sources after annealing. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd.


Published in:
Scripta Materialia, 161, 58-61
Year:
Mar 01 2019
ISSN:
1359-6462
Keywords:
Laboratories:




 Record created 2019-01-23, last modified 2019-06-19


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