LOW-TEMPERATURE MECHANICAL LOSS MEASUREMENTS OF 5N AND 6N LEAD

Measurements of the dynamic modulus and internal friction of 5N and 6N lead were performed after low-temperature plastic deformation. Low-te mperature deformation induces an important decrease in the low-tempera ture modulus. This result is associated with lubrication dislocation m otion due to intrinsic point defects. Finally, the evolution of the re laxation peak observed when the annealing temperature is increased dem onstrates that Bordoni relaxation due to kink pair formation occurs in lead at a very low temperature compared with other f.c.c. metals.