Dynamic recrystallization of 99.999 mass% aluminum single crystal with [111] orientation during creep testing

Constant-compressive-load creep testing on [111] single crystals of 99.999 mass% purity aluminum was carried out at 473 and 533 K. Rapid increases in the creep rate (strain burst) were observed under the stress ranging from 15 to 30 MPa at 473 K. The strain burst was also observed at 533 K under 10, 15 and 20 MPa, but there was the less increase in the strain at the strain burst. Microstructural observations revealed that the strain burst is caused by dynamic recrystallization accompanying rapid grain growth of a few grains. It was confirmed that dynamic recrystallization takes place during the creep testing of high purity aluminum.