Abstract
CA-alloy (Corson alloy containing several % of Al) was quenched from 850°, cold rolled 0, 10, 30, 45 and 60%, tempered at various temperatures and examined by X-ray back reflection method using Cu-K radiation. When reduction by cold rolling is small, change of the lattice constant, which occurs at about 350°, becomes large and reaches a maximum at 500°. But when rolled about 50%, as internal strain exists, the lattice enlarges, diffusing the line to a large extent and beginning to decrease the lattice constant due to removal of internal strain at a temperature lower than 200°. The change of lattice constant due to artificial ageing begins at a temperature lower than 350° and as these temperature ranges overlap each other, K doublet is not resolved before the process of ageing is almost ended.
Coefficient of internal friction was determined from logarithmic decrement of vibration in vacuum. It decreases by cold working and removal of internal strain, but artificial ageing causes increase at first and then decrease of it.
