On the kinetics of stress jumps during plastic deformation of crystals

✍ Scribed by V.V. Demirski; S.N. Komnik

• Publisher: Elsevier Science
• Year: 1982
• Weight: 688 KB
• Volume: 30
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(82)90143-2

✦ Synopsis

This is a study of jump parameters for the case of twinning in Cu + 7 at.% Al single crystals at 295 K over a wide range of effective mass M and stiffness K of the crystal-machine system. The stress jump amplitude is shown to be independent of K, the jump time At and the deformation kinetics to depend essentially on the parameters K and M and the stress measured near the crystal to be practically constant throughout At. This relaxation process is analyzed with allowing for the inertia of the loading system effective mass. The approach used is well suitable both for the experimental results of this work and for the generally known jump parameters at cryogenic temperatures and during the Portevin-Le Chatelier effect. The condition of the jumplike character of the deformation is formulated: the strain rate sensitivity of the ffow stress must be below critical, which depends on the parameters M and K. The ex~rimentally observed features of deformation process during the jump may not be explained without allowance for the interrelation of microscopic processes responsible for the jump and the inertia of the loading system effective mass.