Abstract
A number of processes may occur during recovery, which reduce the stored energy and coarsen the structure, paving the way for the nucleation of recrystallization. In this review, recovery is discussed based on the initial deformed structure. Recovery in samples deformed to low-to-medium strains is briefly considered, whereas recovery in samples deformed to much higher strains is discussed in more detail. An example is Al, where a new and important recovery mechanism is triple junction motion, which can remove thin lamellae and consequently increase the thickness of neighbouring lamellae. This recovery mechanism therefore coarsens the structure and causes a gradual transition from a lamellar to a near equiaxed structure preceding recrystallization. This mechanism is discussed in conjunction with structural pinning, which stabilizes the coarsening microstructure, thereby balancing the forces controlling the rate of recovery by triple junction motion. Operation of triple junction motion in other heavily deformed metals, such as Ni and Cu, is also briefly discussed.
Highlights
Recovery by triple junction motion in heavily deformed metalsI O P Conference Series: Materials Science and Engineering, 89, [012014]
Recovery is traditionally defined as all annealing processes occurring in deformed materials without migration of high angle boundaries [1], whose misorientation angles are typically larger than 15°, and it is usually considered as a precursor of recrystallization [2]
Triple junction motion has been classified as a recovery mechanism since it occurs before primary recrystallization, migration of high angle boundaries is heavily involved
Summary
I O P Conference Series: Materials Science and Engineering, 89, [012014]. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.
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