Steady non-Newtonian flows in copper and iron aluminide at elevated temperatures
2007 (English)In: Journal of Materials Processing Technology, ISSN 0924-0136, Vol. 189, no 1-3, 428-434 p.Article in journal (Refereed) Published
On the basis of dislocation climb and mobility, a steady-state non-Newtonian flow law is derived for two metallic and one intermetallic material,namely electrolytic tough pitch copper, phosphorus alloyed pure copper, and Fe24AlMo iron aluminide. The purpose is to develop a flow lawapplicable to the finite element simulation for hydrodynamic flow of incompressible metals. The model can accurately represent the experimentalflow stress values and the viscosity of the materials. The mathematical form of the model is similar to that of the free-volume approach, which isused for liquids and amorphous metals. The study indicates that in the temperature and strain-rate regimes that are appropriate to the hot-workingprocesses, the Cohen–Grest model, which is essentially related to the total thermal expansion of fluid, can phenomenologically be extended to thecrystalline solid-state materials for the depiction of viscosity data.
Place, publisher, year, edition, pages
Elsevier B.V. , 2007. Vol. 189, no 1-3, 428-434 p.
Copper; Iron aluminides; Shear rate; Steady non-Newtonian flow; Shear-thinning fluid; Viscosity
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-48148DOI: 10.1016/j.jmatprotec.2007.02.024ISI: 000246326700057ScopusID: 2-s2.0-34047142231OAI: oai:DiVA.org:kth-48148DiVA: diva2:456880
QC 201111232011-11-162011-11-162011-11-23Bibliographically approved