M. Farhani,, M. Soltanieh, M. R. Aboutalebi,
Volume 5, Issue 3 (9-2008)
Abstract
Abstract: Dissolution and recovery of Mn-Al compacts with and without a chloride flux was
studied by taking samples from the melt after addition of the compact. Events occurring after the
addition of the compacts into the melt were studied using water quenched specimens after holding
them for a specified time in molten state. The cross sections of these specimens were characterized
by SEM as well as optical imaging. The results showed that an optimized amount of flux (10 to
15%wt. in this research) considerably decreases the time to reach more than 90% recovery in
comparison with non-fluxed compacts. The flux caused the intermetallic forming reactions to be
started considerably sooner in fluxed compacts in comparison with the non-fluxed compact.
Consequently, the incubation time decreased from about 180 seconds for non-fluxed compacts to
less than 3 seconds for compacts with 10%wt. flux.
Yogesh Dewang, Vipin Sharma,
Volume 18, Issue 1 (3-2021)
Abstract
Finite element analysis has been carried out to investigate the effect of various parameters on axisymmetric hot extrusion process using aluminum alloy. The objective of the present work is to investigate the effect of friction coefficient, die angle, die-profile radius and predefined temperature of workpiece through FEM simulation of extrusion process. Nodal temperature distribution, heat flux, peak temperature at nodes and peak flux induced are identified as the output variables to assess the thermo-mechanical deformation behavior of aluminum alloy. Mesh sensitivity analysis is performed for the evaluation of mesh convergence as well as depicts the accuracy of present FEM model. Higher will be the coefficient of friction between interacting surfaces of die-billet assembly, more will be the increment in nodal temperature in billet. Higher will be the coefficient of friction, higher will be the generation of heat flux within billet, as this is achieved for highest coefficient of friction. Peak nodal temperature diminishes with increase in die profile radius nearly by 17 %.Maximum heat flux diminishes non-linearly by 30% with increase in die profile radius. Maximum nodal temperature increases nearly linearly by 14% with increment in predefined temperature of billet. Maximum heat flux decreases non-linearly by 5 % with increment in the initial temperature of workpiece. Validation of present numerical model is established on the basis of deformation behavior in terms of evolution of nodal temperature distribution upon comparison with previous studies available in literature.
