Hot deformation and corrosion behaviour of Mg Ce alloy

Abstract

Magnesium has lowest density 1.638 g/cm3 among the structural materials, but also known for newlinelimited ductility at room temperature bearing c/a ratio of 1.624 just lower than ideal value for newlineany hcp lattice. Addition of Ce in Mg improves the restricted ductility owing to limited number newlineof deformation components and also being hcp lattice as in pure Mg. Improvement in ductility newlineis attributed to the weak basal texture as in the starting material in the extruded rod. newlineEnhancement in the ductility can be understood in term of flow behaviour of Mg-0.5 (wt%) Ce newlinealloy to justify the deformation mechanisms. In this study, hot compression test of extruded newlineMg-0.5wt% Ce alloy was conducted using UTM to locate the deformation regime in the newlineprocessing maps requisite for further manufacturing operations. The processing maps were newlinegenerated using experimental data of flow stress spread over five temperatures from 523 K, newline573 K, 623 K, 673 K to 723 K and five strain rates 0.001 s-1, 0.01 s-1, 0.1 s-1, 1 s-1 and 10 s-1. newlineThe deformation behaviour exhibited by the true stress-strain curves depicts flow stress newlineincreases with increase in strain rates but decreases with increase in the temperature and newlinesignificantly depended on the strain. The flow stress behaviour of plastic deformation during newlinehot compression of Mg-Ce alloy is governed by constitutive equations desired for the designing newlineappropriate manufacturing operation for defect-free component and its service performance. A newlinenew physical model for hot deformation characteristics of Mg-Ce alloy considering constitutive newlineequations, based on the hyperbolic-sinusoidal Arrhenius-type have been established as a newlinefunction of strain rate and deformation temperature and later characterized by a temperature newlinecompensated strain rate parameter known as Zener-Holloman parameter. The authority of newlinevarious material constants on true strain ranging from 0.1 to 0.5 was established using a newlinemathematical correlation. These material constants were found to be suitable to fit the true newlinestrain dependency with 4th