ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The kinetics of recrystallisation of an SAP alloy containing 5.25 wt % oxide has been studied, mainly by metallographic observations and transmission electron microscopy. At the beginning of the process the isothermal reaction follows the Avrami lawx=1− exp (−Bt k) withk − 1.7. A deviation from the above kinetics takes place with increasing time; it is shown by metallographic observations and from the effect of preliminary recovery that this behaviour results from competition between recovery and recrystallisation. The competing process has an activation energy close to the value of 1.57 eV, previously determined for the stage of dislocation recovery preceding recrystallisation. Results reported by other authors have been analysed, and it is noticed that competition is a general feature of recrystallisation in these alloys; this effect becomes more pronounced with increasing oxide concentration, and can ultimately stop recrystallisation. The analysis of the kinetics of recrystallisation indicates that the dispersed phase not only reduces the driving force for grain boundary migration, but also affects mobility by raising the activation energy of the process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00741962
Permalink