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Flow localization in an Al-2.5Mg alloy after severe plastic deformation

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Title Flow localization in an Al-2.5Mg alloy after severe plastic deformation
 
Creator KAPOOR, R
SHEKHAWAT, SK
SAMAJDAR, I
 
Subject Severe plastic deformation
Equal channel angular pressing
Al alloy
Shear localization
High strain rate
CHANNEL ANGULAR EXTRUSION
STRAIN-RATE SENSITIVITY
ADIABATIC SHEAR BANDS
ULTRAFINE GRAIN SIZES
AL-MG ALLOY
MICROSTRUCTURAL EVOLUTION
NANOSTRUCTURED MATERIALS
DYNAMIC DEFORMATION
STAINLESS-STEEL
RATE BEHAVIOR
 
Description AA5052 was subjected to severe plastic deformation using the equal channel angular pressing (ECAP) technique. The microstructure, quantified using electron backscattered diffraction, showed that ECAP refined the grain size, increased the fraction of high angle boundaries (from 0.46 to 0.75) and increased total boundary area per unit volume of AA5052. ECAP increased the flow stress from about 325 to 425 MPa and strain rate sensitivity from 0.005 to 0.012 and reduced strain hardening exponent from 0.34 to 0.25. Shear localization in the ECAP as well as unpressed AA5052 was studied using hat-shaped samples deformed at both quasi-static strain rates in a screw-driven machine and dynamic strain rates in a split-Hopkinson bar. The shear band formation in the hat-shaped sample was narrow and well defined for the ECAP condition as compared to the unpressed condition where the shear band was broad and diffuse, implying an increased propensity for shear localization as compared to the unpressed condition. The microstructure within the shear band of the ECAP condition sample showed that the boundary area per unit volume decreased as compared to that away from the shear band. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:13:35Z
2014-12-28T17:13:35Z
2014
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 611114-122
0921-5093
1873-4936
http://dx.doi.org/10.1016/j.msea.2014.05.080
http://dspace.library.iitb.ac.in/jspui/handle/100/16974
 
Language English