Abstract: This paper discussed the
superplasticity behavior of aluminum-copper cast alloy with
different amount of rate-earth element and superplastic forming
test of a machine part was conducted. The results of the test
showed that cast grains of the alloy added 0.009% RE were
refined from 44μm to 23 μm. Aluminium-copper alloy added 0.009%
RE exhibited excellent superplasticity under optimum condition
of tensile deformation and the results were as follows: δ=165%,
flow stress σ=11.5MPa, strain rate sensitivity exponent=0.35.
The grain of alloy was refined further and continued to maintain
equiaxed grain after superplastic deformation.
Key words:
Superplasticity Aluminium alloy Rare-earth element
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