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STRESS-STRAIN RATE RELATIONS FOR HIGH-TEMPERATURE DEFORMATION OF 2-PHASE AL-CU ALLOYS

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Field Value
 
Title STRESS-STRAIN RATE RELATIONS FOR HIGH-TEMPERATURE DEFORMATION OF 2-PHASE AL-CU ALLOYS
 
Creator BAKSHI, PK
KASHYAP, BP
 
Subject eutectic alloy
flow-stress
superplasticity
behavior
size
 
Description Al-Cu alloys containing 6, 11, 17, 24 and 33 wt% Cu, annealed for 0.5-100 h, were deformed by the differential strain-rate test technique over a strain-rate range of approximate to 4 x 10(-6) to 3 x 10-(2) s(-1) at temperatures ranging from 460-540 degrees C. Superplastic behaviour, with strain-rate sensitivity, m approximate to 0.5, and activation energy, Q = 171.5 kJ mol(-1), is shown by the Al-24Cu and Al-33Cu alloys at lower strain rates and higher temperatures. All the alloys show m less than or similar to 0.20 at higher strain rates, but the average activation energy for deformation of the Al-6Cu, Al-11Cu, and Al-17Cu alloys is evaluated to be 480.7 kJ mol(-1), in contrast to a lower value of 211 kJ mol(-1) for the Al-24Cu and Al-33Cu alloys. Instead of grain size, the mean free path between theta particles is suggested to be a more appropriate microstructural parameter for the constitutive relationship for deformation of the Al-Cu alloys.
 
Publisher CHAPMAN HALL LTD
 
Date 2011-07-20T06:21:39Z
2011-12-26T12:51:20Z
2011-12-27T05:37:56Z
2011-07-20T06:21:39Z
2011-12-26T12:51:20Z
2011-12-27T05:37:56Z
1995
 
Type Article
 
Identifier JOURNAL OF MATERIALS SCIENCE, 30(20), 5065-5072
0022-2461
http://dx.doi.org/10.1007/BF00356050
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5379
http://hdl.handle.net/10054/5379
 
Language en