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Microstructure evolution and flow behavior of hot-rolled aluminum - 5% B4C composite
S. Gangolu, A.G. Rao, N. Prabhu, V.P. Deshmukh,
Published in Elsevier Ltd
Volume: 53
Pages: 581 - 587
Differential strain rate compression tests were conducted to study flow behavior of hot rolled Al-5wt% B4C composite as a function of sample orientation (longitudinal and transverse) over the temperature and strain rate ranges of 25-500°C and 10-4 to 1s-1, respectively. The longitudinal samples are found to show lower flow stress than that shown by the transverse samples in the temperature range of 25-200°C. The reverse becomes true at higher temperatures of 300-500°C. The values of stress exponent (n) and activation energy for deformation (Q), based on applied stress, ranged from 10 to 46 and 307-416kJ/mol, respectively. However, by considering effective stress, these values were reduced to n=8 and Q=126-190kJ/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. © 2013 Elsevier Ltd.
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JournalData powered by TypesetMaterials and Design
PublisherData powered by TypesetElsevier Ltd