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

Abstract

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.

Authors:
; ; ;  [1]
  1. Analysis and Measurement Centre, Dept. of Metals and Technology, Harbin Inst. of Technology, Harbin 150006 (CN)
Publication Date:
OSTI Identifier:
7238000
Resource Type:
Journal Article
Journal Name:
Acta Metallurgica; (United States)
Additional Journal Information:
Journal Volume: 40:7; Journal ID: ISSN 0001-6160
Country of Publication:
United States
Language:
English
Subject:
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-)

Citation Formats

Qing, L, Xiaoxu, H, Mei, Y, and Jinfeng, Y. On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy. United States: N. p., 1992. Web. doi:10.1016/0956-7151(92)90118-X.
Qing, L, Xiaoxu, H, Mei, Y, & Jinfeng, Y. On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy. United States. doi:10.1016/0956-7151(92)90118-X.
Qing, L, Xiaoxu, H, Mei, Y, and Jinfeng, Y. Wed . "On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy". United States. doi:10.1016/0956-7151(92)90118-X.
@article{osti_7238000,
title = {On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy},
author = {Qing, L and Xiaoxu, H and Mei, Y and Jinfeng, Y},
abstractNote = {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.},
doi = {10.1016/0956-7151(92)90118-X},
journal = {Acta Metallurgica; (United States)},
issn = {0001-6160},
number = ,
volume = 40:7,
place = {United States},
year = {1992},
month = {7}
}