Abstract
The plastic properties of an aluminium alloy are defined by its microstructure. The most important factors are the presence of alloying elements in the form of solid solution and precipitates of various sizes, and the crystallographic texture. A nanoscale model that predicts the work-hardening curves of 6xxx aluminium alloys was proposed by Myhr et al. The model predicts the solid solution concentration and the particle size distributions of different types of metastable precipitates from the chemical composition and thermal history of the alloy. The yield stress and the work hardening of the alloy are then determined from dislocation mechanics. The model was largely used for non-textured materials in previous studies. In this work, a crystal plasticity-based approach is proposed for the work hardening part of the nanoscale model, which allows including the influence of the crystallographic texture. The model is evaluated by comparison with experimental data from uniaxial tensile tests on two textured 6xxx alloys in five temper conditions.
Highlights
Aluminium alloys are the second most important metallic structural materials after steel and are used in the broadest range of products
The yield strength, work-hardening and fracture strain of two aluminium alloys may differ by an order of magnitude
CP-Nanostructure Model (NaMo) provided some improvements over the baseline NaMo with respect to predicting the stress-strain curves of the two studied alloys in the reference direction, mainly by accounting for the texture influence in a better way than by using a constant Taylor factor
Summary
Aluminium alloys are the second most important metallic structural materials after steel and are used in the broadest range of products. The variety of their applications is mirrored by the variety of properties they exhibit. The yield strength, work-hardening and fracture strain of two aluminium alloys may differ by an order of magnitude. In addition some aluminium products, including extruded and rolled sheets, possess considerable plastic anisotropy. Such variety of properties has quite often some common underlying physical mechanisms, which just manifest themselves differently in different conditions. An important task of material science is to uncover these physical mechanisms and to express them through quantitative models, which can be used in practical applications
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