RHEOLOGICAL MODEL OF FLOW OF A MATERIAL WITH
A VARIABLE STRUCTURE UNDER SUPERPLASTIC DEFORMATION

M. A. Tsepin, Jeng Syn, N. L. Lisunets, and A. V. Chekin

UDC 621.7.043:539.374

Versions of rheological models describing the phenomenological 
behavior of materials in the superplasticity state with allowance 
for the elastic component and without allowance for it have been presented. 
Consideration has been given to the basic indications of manifestation 
of superplastic properties from the viewpoint of the influence of 
the dimensions of the structural components on them. Analytical dependences 
of the governing relations of the mechanics of a deformable rigid 
body, which allow for the influence of the applied stresses, the structure, 
and the temperature on the rate of superplastic deformation (SPD) 
and enable one to calculate the shear viscosity and the rheological 
dependences of SPD for deformable aluminum alloys AMg4 and AMg6 with 
a prepared ultrafine-grained structure, have been given.

Moscow State Institute of Steel and Alloys (Technological 
University), Moscow, Russia. Translated from Inzhenerno-Fizicheskii 
Zhurnal, Vol. 76, No. 3, pp. 131-134, May-June, 2003. Original 
article submitted September 6, 2002.