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Softening of Al during multi-axial forging in a channel die

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Title Softening of Al during multi-axial forging in a channel die
 
Creator KAPOOR, R
SARKAR, A
YOGI, R
SHEKHAWAT, SK
SAMAJDAR, I
CHAKRAVARTTY, JK
 
Subject Multi-axial forging
Channel die
Severe plastic deformation
Al
Softening
SEVERE PLASTIC-DEFORMATION
ULTRAFINE-GRAINED ALUMINUM
STRAIN-RATE SENSITIVITY
MICROSTRUCTURAL EVOLUTION
MECHANICAL-BEHAVIOR
ELECTRON-MICROSCOPY
MG ALLOY
METALS
BOUNDARIES
TEMPERATURES
 
Description Multi-axial forging of Al was carried out at room temperature in a confined channel die as a means of achieving severe plastic deformation (SPD). The microstructures of the 3, 6 and 9 pass samples were quantified using electron back scattered diffraction to obtain the distribution of boundary spacing and fraction of high angle boundaries. Subsequent compression tests at room temperature were carried out to determine their strength and strain rate sensitivity. Softening was observed beyond 6 passes both in terms of the pressing stress as well as the subsequent compression tests. Beyond 6 passes the fraction of high angle boundaries increased and the geometrically necessary dislocations (GND) density decreased. It was estimated that during SPD, Al had a higher hardening contribution due to GND and subgrain walls than that due to Hall-Petch type grain boundary strengthening. It was shown that as the fraction of high angle boundaries increased with increasing deformation, the dislocation strengthening term decreased and the Hall-Petch term increased, resulting in a net softening effect. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-10-16T06:57:41Z
2014-10-16T06:57:41Z
2013
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 560404-412
http://dx.doi.org/10.1016/j.msea.2012.09.085
http://dspace.library.iitb.ac.in/jspui/handle/100/15492
 
Language en