A Creep Analysis of Superplastic Materials : Constant Load Creep of the Al-Zn Eutectoid-Base Superplastic Alloys

概要

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Some phenomenological equations to hold among creep parameters of superplastic materials have been derived from a mechanical equation of state for superplasticity. A constant tensile-load creep test was carried out for Al-Zn eutectoid-base alloys to verify these equations. The equations agreed fairly well with the experimental results. Principal results obtained are as follows: Steady state creep disappears under the constant load. Accelerated creep accounts for most of creep strain. The relation between creep strain and time, and the time to rupture will be obtained if the minimum creep strain rate and m-value are known, where m is the strain rate sensitivity.
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