Comparison of torsion and compression constitutive analyses for elevated temperature deformation of Al–Li–Cu–Mn alloy
| Autor: | H.J. McQueen, D. D. Perovic, G. Avramovic-Cingara |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Arrhenius equation
Materials science Mechanical Engineering Alloy chemistry.chemical_element Torsion (mechanics) Thermodynamics Activation energy engineering.material Condensed Matter Physics Power law symbols.namesake chemistry Mechanics of Materials Aluminium engineering Exponent symbols General Materials Science Zener diode |
| Zdroj: | Materials Science and Technology. 19:11-19 |
| ISSN: | 1743-2847 0267-0836 |
| DOI: | 10.1179/026708303225008716 |
| Popis: | Experimental alloy 2090 (Al – 2.1Li – 2.6Cu – 0.4Mn) was deformed in torsion and compression at temperatures T=300, 400, and 500°C and strain rates e=10–2 to 10 s–1. The torsion and compression results were analysed using equation A(sinh ασ)n=Z=e exp(QHW/RT), where Z is the Zener – Hollomon parameter. The variation of stress exponent n, Arrhenius slope s, and activation energy QHW were calculated with variation of the stress multiplier a from 0.01 to 0.08 MPa–1. The change of α caused the stress exponent to decrease at a declining rate and Arrhenius slope s to increase linearly, thus causing the activation energy QHW to become stable above α=0.04 MPa–1. The two experimental test techniques gave very similar flow stresses and constitutive constants. At α=0.052 MPa–1 activation energy values showed reasonable consistency with other age hardenable aluminum alloys. The compression tests were also analysed using the power law expression e exp(Q′HW/RT)=Z=A″σn′. |
| Databáze: | OpenAIRE |
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