99.999 mass%アルミニウム単結晶の引張試験における動的再結晶

抄録

Tensile testing on 99.999 mass% purity aluminum was carried out in the temperature range of 413 to 653 K. The deformation behavior of single crystals of three orientations was compared at the initial strain rates of 1.67×10⁻⁴, 1.67×10⁻³ and 1.67×10⁻² s⁻¹. Typical stress oscillations inherent to the discontinuous dynamic recrystallization were observed.
Microstructural observation detected dynamically recrystallized grains containing subgrains. It was confirmed that dynamic recrystallization takes place even at the tensile testing showing macroscopically homogeneos deformation mode. The activation energy on the rate controlling process was calculated from the temperature and strain rate dependence of the first peak stress of the stress oscillation. The obtained value 140+⁄−10 kJ· mol⁻¹ was near the activation energy for the self diffusion of aluminum.