Abstract
The θ projection method, originally developed to describe the creep curve even in the tertiary creep section, was applied to creep curves observed in pure aluminium. Since this test material has wide expansion of the secondary stage of creep, the original θ projection method cannot necessarily be applied to the whole creep curve. Then the authors modified the θ projection method, replacing a Blackburn-type equation of creep to a Bailey-type equation for the primary creep section. Four parameters derived from the modified equation were expressed as functions of testing temperature, applied stress and grain size of the test material. As a consequence, the proposed equation can determine the whole creep curve except the rupture point, and the minimum creep rate. Using four paramaters extrapolated on the test condition of creep, unknown creep curve can be easily obtained.
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