Precipitation during serrated flow in AlZn5Mg1

✍ Scribed by E. Pink; W.M. Webernig

• Publisher: Elsevier Science
• Year: 1987
• Weight: 661 KB
• Volume: 35
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(87)90220-3

✦ Synopsis

The stress drops Au of serrations and the time intervals At between them were analyzed as functions of strain rate and temperature. For small values of At the relation between Au and the preceding At agrees with Cottrell and Bilby's law of the aging of a stationary dislocation. As AI increases, the relation follows the trend predicted by modifications of the law. However, a more quantitative comparison together with features of serrations lead to suspect that an actual precipitation of second phases intensifies the deviations. Activation enthalpies were calculated from Au and At as 52 k 2 kJ/mol for the range where the Cottrell-Bilby law is valid, as well as for the range which is interpreted as interfered with by a precipitation process.

R&un&-Nous avons analysi: les chutes de contrainte Au des dents de scie et les intervalles de temps AI