Hot deformation behavior of 6061 Al-SiC{sub p} composites synthesised by casting route
- Indian Institute of Science, Bangalore (India). Dept. of Metallurgy
The constitutive flow behavior of 6061 Al-SiC particle composite has been studied at temperatures varying from 300{degree}C to 550{degree}C as a function of strain and strain rate in the range of 0.001 to 1.0 s{sup {minus}1}. Limited strain hardening is observed at very low strain, but steady-state flow is found to be the main feature of hot deformation. The stress exponent varies from 9.09 to 4.34 with increasing temperature, which is as high as twice the stress exponent of base alloy in the same temperature range. The apparent activation energy for hot deformation has been calculated and compared to that computed from creep studies reported in the literature. The value is as high as three times the activation energy of self diffusion in aluminum. 6061 Al-SiC particle composite did not show any transition in mechanical behavior, the characteristic which had been observed in many two phase alloys including short fiber and whisker reinforced composites. This has been attributed to faster stress relaxation in particle composites.
- OSTI ID:
- 143662
- Report Number(s):
- CONF-930246--; ISBN 0-87339-251-5
- Country of Publication:
- United States
- Language:
- English
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