Characterization Of Flow Stress Of Different AA6082 Alloys By Means Of Hot Torsion Test

Journal Article · Wed May 04 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3589557· OSTI ID:21516759

Donati, Lorenzo ^[1]; El Mehtedi, Mohamad ^[2]

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1. DIEM Department, University of Bologna, Viale Risorgimento 2, 40136 Bologna (Italy)
2. Department of Mechanics, Universita Politecnica delle Marche, Via Breccie Bianche, 60131 Ancona (Italy)

FEM simulations are become the most powerful tools in order to optimize the different aspects of the extrusion process and an accurate flow stress definition of the alloy is a prerequisite for a reliable effectiveness of the simulation. In the paper the determination of flow stress by means of hot torsion test is initially presented and discussed: the several approximations that are usually introduced in flow stress computation are described and computed for an AA6082 alloy in order to evidence the final effect on curves shapes. The procedure for regressing the parameters of the sinhyperbolic flow stress definition is described in detailed and applied to the described results. Then four different alloys, extracted by different casting batches but all namely belonging to the 6082 class, were hot torsion tested in comparable levels of temperature and strain rate up to specimen failure. The results are analyzed and discussed in order to understand if a mean flow stress behavior can be identified for the whole material class at the different tested conditions or if specific testing conditions (chemical composition of the alloy, specimen shape, etc) influence the materials properties to a higher degree.

• OSTI ID: 21516759
• Journal Information: AIP Conference Proceedings, Vol. 1353, Issue 1; Conference: ESAFORM 2011: 14. international ESAFORM conference on material forming, Belfast, Northern Ireland (United Kingdom), 27-29 Apr 2011; Other Information: DOI: 10.1063/1.3589557; (c) 2011 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM ALLOYS
APPROXIMATIONS
CASTINGS
CHEMICAL COMPOSITION
DEFORMATION
EXTRUSION
FAILURES
FINITE ELEMENT METHOD
FLOW STRESS
SIMULATION
STRAIN RATE
TOOLS
TORSION
ALLOYS
CALCULATION METHODS
EQUIPMENT
FABRICATION
MATERIALS WORKING
MATHEMATICAL SOLUTIONS
NUMERICAL SOLUTION
STRESSES