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Microstructure evolution and flow behavior of hot-rolled aluminum-5% B4C composite

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Title Microstructure evolution and flow behavior of hot-rolled aluminum-5% B4C composite
 
Creator GANGOLU, S
RAO, AG
PRABHU, N
DESHMUKH, VP
KASHYAP, BP
 
Subject METAL-MATRIX COMPOSITES
STRAIN-RATE SUPERPLASTICITY
REINFORCED ALUMINUM COMPOSITES
BORON-CARBIDE
MECHANICAL-BEHAVIOR
CREEP-BEHAVIOR
TEMPERATURE
ALLOY
DEFORMATION
STRESS
 
Description Differential strain rate compression tests were conducted to study flow behavior of hot rolled Al-5 wt% B4C composite as a function of sample orientation (longitudinal and transverse) over the temperature and strain rate ranges of 25-500 degrees C and 10 (4) to 1 s (1), respectively. The longitudinal samples are found to show lower flow stress than that shown by the transverse samples in the temperature range of 25200 degrees C. The reverse becomes true at higher temperatures of 300-500 degrees C. The values of stress exponent (n) and activation energy for deformation (Q), based on applied stress, ranged from 10 to 46 and 307416 kJ/mol, respectively. However, by considering effective stress, these values were reduced to n = 8 and Q = 126-190 kJ/mol. This stress exponent ofn = 8 is further reduced to n = 5 by considering substructural evolution, which suggests the dislocation climb creep mechanism to be favorable for deformation. (C) 2013 Elsevier Ltd. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2014-12-28T16:56:54Z
2014-12-28T16:56:54Z
2014
 
Type Article
 
Identifier MATERIALS & DESIGN, 53581-587
0261-3069
1873-4197
http://dx.doi.org/10.1016/j.matdes.2013.07.025
http://dspace.library.iitb.ac.in/jspui/handle/100/16941
 
Language English