Observations and calculations on mechanical anisotropy and plastic flow of an AlZnMg extrusion

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(96)00015-8· OSTI ID:389802

Fjeldly, A; Roven, H J ^[1]

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1. Norwegian Univ. of Science and Technology, Trondheim (Norway). Dept. of Metallurgy

An extruded plate of the alloy AA7108 has been characterized using texture analysis and uniaxial tensile tests. The yield surface, directional yield stresses and plastic strain ratios are calculated from Taylor-Bishop-Hill analysis, employing the measured texture data in combination with either the full constraints model or a relaxed constraints model. Three phenomenological yield functions, capable of describing yield anisotropy, are compared by means of their ability to reproduce the shape of the crystallographic yield surface and to predict directional properties, i.e., R-values and yield stress. On the basis of experiments and calculations it has been found that the Taylor relaxed Constraints model describes the present material more consistently with respect to experimental findings than the Taylor full constraints model.

• OSTI ID: 389802
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 44; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
AUTOMOBILES
DEFORMATION
MAGNESIUM ALLOYS
MATERIALS
MATHEMATICAL MODELS
PLASTICITY
PREDICTION EQUATIONS
STRAINS
STRESSES
TENSILE PROPERTIES
TEXTURE
YIELD STRENGTH
ZINC ALLOYS