Constitutive equations for use in prediction of flow stress during extrusion of aluminium alloys

Sheppard, T.; Jackson, A. G.

doi:10.1179/mst.1997.13.3.203

Cited by 236 publications

(80 citation statements)

References 8 publications

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“…ε), and temperature (T) has been illustrated using constitutive equations derived by several models [25][26][27]. The Arrhenius model is mostly used because the effect of strain rate and temperature are well considered [28].…”

Section: Constitutive Modelingmentioning

confidence: 99%

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Wang

Niu

et al. 2016

Metals

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Abstract:The hot deformation behavior of as-cast and homogenized Al 0.5 CoCrFeNi high entropy alloys (HEAs) during isothermal compression was investigated as a function of temperature and strain rate. Results indicated that flow stress in a homogenized state was always higher than that in an as-cast state under the same deformation conditions. Moreover, the optimum thermo-mechanical processing (TMP) conditions for the hot working of the homogenized state were identified as 945-965 • C and 10 −1.7 -10 −1.1 s −1 and were easier to determine in practice. Constitutive equations, for both states, correlating the flow stress of Al 0.5 CoCrFeNi with strain rate and deformation temperature were also determined.

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Section: Constitutive Modelingmentioning

confidence: 99%

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Wang

Niu

et al. 2016

Metals

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“…The flow stress calculation is based on the Zener-Holloman parameter [16]. Zener and Holloman [17] found out that the effects of changes in strain rate and in temperature depend upon the stress and strain relation in the material.…”

Section: Description Of the Heat Flow Analysis Modelmentioning

confidence: 99%

A study on heat-flow analysis of friction stir welding on a rotation affected zone

2014

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In recent years, as interest in environmental protection and energy conservation rose, technological development for lightweight efficiency of transport equipment, such as aircrafts, railcars, automobiles and vessels, have been briskly proceeding. This has led to an expansion of the application of lightweight alloys such as aluminum and magnesium. For the welding of these lightweight alloys, friction stir welding has been in development by many researchers. Heat-flow analysis of friction stir welding is one such research. The flow and energy equation is solved using the computational fluid dynamic commercial program 'Fluent'. In this study, a rotation affected zone concept is imposed. The rotation affected zone is a constant volume. In this volume, flow is rotated the same as the tool rotation speed and so plastic dissipation occurs. Through this simulation, the temperature distribution results are calculated and the simulation results are compared with the experimental results.

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“…Sheppard and Jackson [23] published material constants for the constitutive law for 2014 Al alloy, which are as follows: α/MPa …”

Section: Materials Propertiesmentioning

confidence: 99%

Modeling of friction stir welding process for tools design

Lin

Zhao

et al. 2011

Front. Mater. Sci.

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A three-dimensional friction stir welding (FSW) process model has been developed based on fluid mechanics. The material transport in the welding process has been regarded as a laminar, viscous, and non-Newtonian liquid that flows past a rotating pin. A criterion to divide the weld zone has been given on the basis of cooperation of velocity field and viscosity field. That is, the η 0 -easy-flow zone that existed near the tool pin corresponded to the weld nugget zone; the area between the η 0 -easy-flow zone and η 1 -viscosity band is corresponded to the thermal-mechanical affected zone (TMAZ). The model gives some useful information to improve the understanding of material flow in FSW through the simulation result of velocity distribution. In order to appraise the friction stir pin design, three kinds of pin geometry, one is column pin, the second is taper pin, and the last one is screw threaded taper pin, were used in the model. The pin geometry seriously affected the simulation result of velocity distribution in the η 0 -easy-flow zone. The velocity distribution in the η 0 -easy-flow zone can be considered as the criterion of optimizing friction stir tool design. This study will benefit to direct the friction stir tool design.

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Constitutive equations for use in prediction of flow stress during extrusion of aluminium alloys

Cited by 236 publications

References 8 publications

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

A study on heat-flow analysis of friction stir welding on a rotation affected zone

Modeling of friction stir welding process for tools design

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