The Effect of Plastic Strain Rate on Diffusion in Aluminum-Zinc Alloys

摘要

The effect of compressive strain-rate on interdiffusion and zinc self-diffusion in aluminum-zinc alloys has been investigated. At a strain rate of 0.0002/sec, the interdiffusion coefficient is increased by factors of 20, 13, and 8 at 375, 415, and 450C respectively. At comparable strain rates, little enhancement of self-diffusion is detected. Quasi-hydrostatic pressure causes the interdiffusion coefficient to decrease much more than predicted theoretically. Factors are suggested which could account for the results, but existing uncertainties preclude a precise interpretation. (Author)