Publication: The influence of particle distribution and volume fraction on the mechanical properties of aluminium alloys

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Title	The influence of particle distribution and volume fraction on the mechanical properties of aluminium alloys
Authors/Editors*	X. Duan, D. Metzger, M. Jain,D. Wilkinson
Where published*	Mechanics of Materials
How published*	None
Year*	2004
Volume	0
Number	0
Pages
Publisher	xxxxx
Keywords	localization, bifurcation, formability, aluminium alloy, finite element method
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Abstract	Experimental observations show that the continuous cast (CC) Al-Mg alloy with 0.21 wt% Fe has a considerably lower fracture strain than that of a CC alloy with 0.08 wt% Fe and a direct chill cast (DC) alloy with 0.21% Fe. However, the forming limit strains are almost the same for the three alloys. The similarities and differences are thought to relate with the distribution of hard second-phase particles. In the present paper, the influence of particle distribution characteristics (random vs. stringer pattern) and volume fraction (1.2% vs. 3.5%) is examined in detail with the use of a simple plane stress finite element unit cell model. The model permits extension of the composite stress/strain curve beyond the diffuse necking condition so that the nominally uniform response is followed directly by localized necking. The model results agree very well with tensile tests with respect to the differing behaviour of the three materials in the deformation range between the onset of diffuse necking and that for localized necking.