In situ observation of dynamic recrystallization in five-nine aluminum by a transmission Laue method
- Yamaha Motor Co., Ltd., Iwata (Japan). R and D Div. 2
Zone refined aluminum shows regular multipeak stress oscillations during deformation at elevated temperatures. Microstructural observations after compression testing have detected recrystallized grains containing subgrain structures in numerous cases. It is thought, in an accepted theory, that dynamic recrystallization (DRX) does not take place as a restorative process in aluminum because of the high stacking fault energy. Experimental results, however, strongly demonstrate that the stress oscillations are due to DRX. Against this conclusion, McQueen et al. have suggested that the stress oscillation is caused by dynamic grain growth or by friction between a specimen and platens. Moreover, they have the opinion that the observed recrystallized structure is due to static recrystallization after deformation has terminated. It is certain that the recrystallized structure observed after the deformation does not in itself constitute strong evidence for DRX, even if a rapidly cooled specimen is used. Given these standpoints, in situ detection of DRX was undertaken. The diffraction pattern was studied using the transmission Laue method. A pattern change was continuously photographed during a regular multipeak stress oscillation in a 533K compression test.
- OSTI ID:
- 5509601
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:4; ISSN SCRMEX; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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