Abstract
An enhanced crystal-plasticity finite-element model is developed to model the effects of texture, grain size and loading direction on asymmetrical tension-compression behaviour of AM30 magnesium alloy. A constitutive description of plastic deformation in the suggested scheme accounts for contributions from deformation slip and twinning. The calibrated model was employed to investigate the effects of texture and grain size on the yield stress and strain-hardening behaviour of AM30 magnesium alloy at room temperatures under various loading conditions. The study reveals that grain refinement and initial texture significantly influence the mechanical behaviour of AM30. Results show that the key factor controlling the tension-compression asymmetry is deformation twinning. Two techniques, which could be used to reduce this asymmetry, are grain refinement and weakening of the initial texture in extruded AM30.
Highlights
Magnesium and its alloys have attracted significant attention in recent years as materials suitable for components in the automotive and biomedical sectors
The current study aims to investigate the effects of grain size and texture intensity on the tension and compression deformation mechanisms as well as the observed tension-compression asymmetry in extruded AM30 at room temperature (T = 293 K)
The grain size and texture intensity of the extruded AM30 are studied with emphasis on critical assessment of the underlying deformation mechanisms
Summary
Magnesium and its alloys have attracted significant attention in recent years as materials suitable for components in the automotive and biomedical sectors. Numerical modelling techniques have the capability to elucidate the influence of individual parameters such as grain size and texture accurately Such an approach can lead to a better understanding of the physics of deformation in Mg and its alloys, which, in turn, can contribute to improving the design of components made from those materials. The current study aims to investigate the effects of grain size and texture intensity on the tension and compression deformation mechanisms as well as the observed tension-compression asymmetry in extruded AM30 at room temperature (T = 293 K). By studying the yielding stress and the strain-hardening behaviours of the magnesium alloy we try to understand the effects of texture and grain size on the mechanical behaviour of the extruded AM30.
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