Abstract
The Portevin-Le Chatelier (PLC) phenomenon or dynamic strain aging in Al–0.5 wt. % Mg alloys was investigated at different strain rates. This research also examined the effect of γAl2O3 nanoparticles on the PLC phenomenon. A nanocomposite made of A206/1.0 wt. % γAl2O3 was manufactured to this purpose and then, added to an Al–0.5 wt. % Mg melt to obtain ingots of Al–0.5 wt. % Mg–20 wt. % A206/1.0 wt. % γAl2O3 and Al–0.5 wt. % Mg–10 wt. % A206/1.0 wt. % γAl2O3 with 6 mm diameter. Cold deformation allowed manufacturing 1 mm diameter wires using the 6 mm diameter ingots. A 300 °C solution treatment, followed by rapid cooling in ice water permitted to retain Mg atoms in solid solution. The tensile tests performed on the wires revealed the PLC phenomenon upon the tensile stress vs. strain plastic zone. The phenomenon was quantified using MatLab™ and statistical analysis. The results demonstrated how the alumina nanoparticles can diminish the serration amplitude of the PLC phenomenon.
Highlights
IntroductionManufacturing parts made of these alloys by plastic deformation may be affected by the occurrence of the Portevin-Le Chatelier (PLC) phenomenon [1]
ΓAl2 O3 samples had higher critical strains at 0.250 mm/min strain rate, concerning the value of the critical strain registered at 0.125 mm/min; it decreases for faster strain rates
The Al–0.5 wt. % Mg–10% A206 sample shows a critical strain with an inverse behavior at low strain rates, followed by normal behavior at high strain rates
Summary
Manufacturing parts made of these alloys by plastic deformation may be affected by the occurrence of the Portevin-Le Chatelier (PLC) phenomenon [1]. This problem could hinder the utilization of the said alloys in specific applications as the PLC serration occurs upon forming a part at room temperature. Such a serration effect presents itself as rough marks on the finished surface and can be characterized through stress-strain tensile curves. The PLC phenomenon can result in structural problems and affect the alloy’s final mechanical properties. The structure or part can fail under service loads, whereas the combination of these effects added to environmental conditions can make the part susceptible to corrosion [2]
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