Modelling of high temperature viscoplastic flow of aluminium alloys by hot torsion testing

Zhou, Min; Clode, Michael

doi:10.1179/026708397790285458

Cited by 3 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several empirical constitutive equations have been proposed. [18][19][20][21][22][23] A properly formulated and validated constitutive equation helps the process designer to obtain optimum processing conditions. Phenomenological constitutive equations are formulated on the basis of a given set of experimental data, and then finding a function that best fits the measured data with a specified number of coefficients.…”

Section: Constitutive Equationmentioning

confidence: 99%

“…The unstable regions (where j , 0) indicate microstructural instability in the material. The ratio J/P (;g/2) and m are the important parameters when using equation (19) to delineate unstable regions in the processing maps.…”

Section: Modified Instability Conditionmentioning

confidence: 99%

“…The instability parameter j defined in equation19 for this case becomes m and the instability condition for the power law nature of the flow stress with strain rate becomes m,The although used elsewhere[8][9][10][11][12] while developing processing maps for magnesium alloys.Rewriting equation(18) in the form: mP-J,0; and differentiating with respect toė,…”

mentioning

confidence: 99%

See 2 more Smart Citations

Modified instability condition for identification of unstable metal flow regions in processing maps of magnesium alloys

Babu¹,

Tiwari²,

Rao³

2005

Materials Science and Technology

View full text Add to dashboard Cite

For the development of processing maps for various magnesium alloys from the flow stress data, a simple instability condition based on Ziegler's continuum principles as applied to large plastic flow is extended to delineate the regions of unstable metal flow or the occurrence of fractures or defects. The measured flow stress data is fitted to a constitutive equation. The applicability of the processing maps developed has been examined by comparing with reported microstructural observations of deformed compression specimens of various magnesium alloys. Optimum hot working conditions for the material are suggested, based on the maximum values of the strain rate sensitivity index.

show abstract

Section: Constitutive Equationmentioning

confidence: 99%

Section: Modified Instability Conditionmentioning

confidence: 99%

See 1 more Smart Citation

Modified instability condition for identification of unstable metal flow regions in processing maps of magnesium alloys

Babu¹,

Tiwari²,

Rao³

2005

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

Development and validation of a processing map for zirconium alloys

Murty

Rao

Kashyap

2002

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

For the development of processing maps to zirconium alloys, a simple instability condition based on the Ziegler's continuum principles as applied to large plastic flow is extended for delineating the regions of unstable metal flow/occurrence of fracture or defects, utilizing the flow stress data of Zr-2.5Nb-0.5Cu. An attempt is made to fit the measured flow stress data in a constitutive equation, useful in the finite element process models. Instability maps at different strain levels were superimposed while delineating the unstable regions in the processing maps. This phenomenon takes into account the dependence of strain rate sensitivity and strain hardening coefficient of the material on the plastic instability during hot deformation. The applicability of the developed processing map has been examined by comparing with the reported microstructural observations of the deformed compression specimens of various zirconium alloys. It is found that the processing map is practically usable in the real fabrication process for the zirconium alloys.

show abstract

Prediction of Microstructure During High Temperature Forming of Ti-6Al-4V Alloy

2003

Transactions of Materials Processing

View full text Add to dashboard Cite

Modelling of high temperature viscoplastic flow of aluminium alloys by hot torsion testing

Cited by 3 publications

References 6 publications

Modified instability condition for identification of unstable metal flow regions in processing maps of magnesium alloys

Modified instability condition for identification of unstable metal flow regions in processing maps of magnesium alloys

Development and validation of a processing map for zirconium alloys

Prediction of Microstructure During High Temperature Forming of Ti-6Al-4V Alloy

Contact Info

Product

Resources

About