Grain growth behaviour of the Al-Cu eutectic alloy during superplastic deformation |
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Authors: | B P Kashyap |
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Affiliation: | (1) Department of Metallurgical Engineering, Indian Institute of Technology, 400 076 Bombay, India |
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Abstract: | Grain growth behaviour of the Al-Cu eutectic alloy was investigated as a function of strain (ε), strain rate
and deformation temperature (T) over
= 10−2 s−1 and T=400 to 540°C. The grain size increases with increase in strain and temperature. Upon deformation to a fixed strain,
the grain growth is generally seen to be more at lower strain rates. The rates of overall grain growth
and due to deformation alone
, however, increase with increasing strain rate according to
and
, respectively. The increase in the grain growth rate with strain rate is attributed primarily to the shorter time involved
at higher strain rate for reaching a fixed strain. The activation energy for grain growth under superplastic conditions is
estimated to be 79 kJ mol−1. |
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Keywords: | |
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