The effect of size on the plastic deformation of annealed cast aluminium microwires. (1st March 2019)

• Record Type: Journal Article
• Authors: Verheyden, S.; Pires Da Veiga, L.; Deillon, L.; Mortensen, A.
• Is Part Of: Scripta materialia. Number 161(2019)
• Page Start: 58
• Page End: 61
• Publication Date: 2019-03-01
• Subjects: Annealing -- Aluminium -- Size effects -- Thermal activation -- Monocrystalline; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.10.009
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: