Effects of temperature and strain rate on compressive flow behavior of aluminum-boron carbide composites
- 26 April 2013
- journal article
- research article
- Published by SAGE Publications in Journal of Composite Materials
- Vol. 48 (11), 1313-1321
- https://doi.org/10.1177/0021998313485265
Abstract
Flow properties of aluminum and aluminum-boron carbide (Al-B4C) composites, containing 5, 10 and 15 wt% B4C, were investigated by compression tests at strain rates of 10−4, 10−3 and 10−2 s−1 over the temperature range 25 to 500℃. The nature of stress–strain curves as a function of reinforcement, temperature and strain rate revealed that (1) flow stress initially increases as the reinforcement increases, but it decreases for Al-15% B4C composite, (2) flow stress increases with the increase in strain rate, with the strain rate sensitivity index varying from 0.01 for aluminum at 200℃ to 0.30 for Al-5% B4C composite. The activation energy for deformation is found to vary from 124 to 187 kJ/mol for Al-15% B4C and Al-5% B4C composites, respectively.Keywords
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