On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Acta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90118-X· OSTI ID:7238000

Qing, L; Xiaoxu, H; Mei, Y; Jinfeng, Y ^[1]

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1. Analysis and Measurement Centre, Dept. of Metals and Technology, Harbin Inst. of Technology, Harbin 150006 (CN)

This paper reports on the microstructural changes of a warm rolled Al-Li alloy occurring during static annealing and superplastic deformation at 515{degrees}C that were studied by means of transmission electron microscopy. Deformation induces a continuous recrystallization with a rapid subgrain growth and a rapid increase in boundary misorientations. The higher strain rate results in a faster subgrain growth and a finer recrystallized grain size. The increasing rate of boundary misorientations and the strain at which the average misorientation reaches about 20{degrees} increase with increasing strain rate. The increase in boundary misorientations is proportional to the subgrain growth during the whole static annealing process. Deformation results in a more rapid increase in boundary misorientation with subgrain size than static annealing. Dislocation gliding plays an important role before the formation of high angle grain boundaries during superplastic deformation. The absorption of dislocations into subgrain boundaries results in a more rapid increase in boundary misorientation during deformation. Thus, the mechanism of the deformation-induced continuous recrystallization is suggested to be the generation of dislocations in grains and the absorption of gliding dislocations into subgrain boundaries.

• OSTI ID: 7238000
• Journal Information: Acta Metallurgica; (United States), Vol. 40:7; ISSN 0001-6160
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
ALUMINIUM ALLOYS
DEFORMATION
LITHIUM ALLOYS
ANNEALING
GRAIN BOUNDARIES
GRAIN ORIENTATION
GRAIN SIZE
HOT WORKING
MICROSTRUCTURE
RECRYSTALLIZATION
STRESS ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
FABRICATION
HEAT TREATMENTS
MATERIALS WORKING
MICROSCOPY
ORIENTATION
SIZE
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
664400 - Experimentally Derived Information on Atomic & Molecular Properties- (1992-)