THERMALLY ACTIVATED DEFORMATION AND DYNAMIC STRAIN AGING OF Zr–4 ALLOY DURING STRESS RELAXATION

The thermally activated deformation and dynamic strain aging(DSA)of Zr-4 were investigated by stress relaxation experiments in a broad temperature range.It is found that in the process of stress relaxation,the plastic deformation rate of the alloy decreases with the relaxation time,and this rate and the stress reduction ratio at the end of relaxation exhibit a minimum value at about 623 K.The activation volume associated with dislocation motion...