Dynamic Internal Friction during High-Temperature Deformation in Aluminum Single Crystals with Different Orientations

Abstract

Following the investigation of dynamic internal friction (DIF) in pure aluminum single crystals with [331] orientation reported before, the DIF in pure aluminum single crystals with two other orientations ([001], [111]) during high-temperature creep and tensile deformation has been studied. It is found that there also appears a peak of DIF at the early stage of deformation for [001] and [111] orientations, the dependence of DIF on measuring frequency and applied stress (or strain rate) is also similar to that observed for [331]. But owing to the differences in the orientation factor and the number of favourable slip systems, there are some differences in the peak height and the level of DIF among different orientations at the same test condition. As an example of the application of DIF, the generation rates of dislocations during creep and tensile deformation are evaluated from the data of DIF in aluminum single crystals with different orientations.