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Vol.21, No.7, 628 ~ 635, 1983
Title
The Temperature and Stress Dependence of cyclic Creep Acceleration in Pure Aluminum
신동혁Dong Hyuk Shin, 남수우Soo Woo Nam
Abstract
Under constant peak stress conditions cyclic creep behavior of pure aluminum is quantitatively investigated in the temperature range of 333K-548K (0.36-0.59 Tm, where Tm is melting temperature in the absolute scale). Cyclic creep acceleration is found to occur up to a temperature of about 0.5 Tm. The phenomenon is more significant with increasing stress at a given temperature. The measured activation energy for cyclic creep deformation, Q_(cy), is found to be lower than that of static creep, Q_(st). It seems that this difference can be interpreted by using an effective diffusion coefficient, D_(eff), Which includes an excess vacancy term for cyclic creep.
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