6061アルミニウム合金O材の衝撃引張強度

抄録

Tensile strength of 6061–O aluminum alloy is presently investigated in the wide ranges of temperature from 77 to 473 K, and of strain rate from 10⁻⁴ to 10³ s⁻¹. At high strain rates a split-Hopkinson pressure bar method is adapted. Temperature and strain rate effects on the stress are not significant at around the room temperature, while the stress greatly depends on the temperature and strain rate with increase of strain in the low temperature range. The thermally activated process concept well describes the temperature and strain rate effects on the stress. Comparing with the effects on the stress in 6061–T6 aged material, athermal component of the stress is significantly reduced due to the largely dispersed precipitates in the present materials, while the temperature and strain rate effects are almost identical in both materials. The dislocation intersection is most plausible deformation mechanism for thermally activated process in 6000 aluminum alloy independent of the aging treatment.