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- Title
Microstructural evolution during creep of a hot extruded 2D70Al-alloy.
- Authors
Guo-jun Wang; Bai-qing Xiong; Yong-an Zhang
- Abstract
Microstructural evolution during creep of a hot extruded Al-Cu-Mg-Fe-Ni (2D70) Al-alloy was investigated in this study using transmission electron microscopy (TEM). The samples for creep test were carried out two-stage homogenization, followed by extruding. The creep ultimate strength dropped and the temperature increased gradually from 312 to 117 MPa and from 423 to 513 K, respectively. The microstructural observation for the crept samples showed that the S′ phase coarsened with increased creep temperature and the aging precipitates transformed from S″ phase to S′ phase during creep process. Meanwhile, excess solute atoms in supersaturated solid solution dynamically precipitated to further form finer S′ phase and S″ phase, which pinned the dislocations and impeded the dislocation movements. Large amount of dislocations piled up around the micron-scale AlFeNi phase, and a lot of dislocation walls were generated along 〈220〉 orientation. S phase accumulates around these defects. The interaction between dislocations and precipitates was beneficial for the improved performances at elevated temperature.
- Subjects
ALLOYS; TRANSMISSION electron microscopy; SOLID solutions; DISLOCATIONS in metals; THERMOPHYSICAL properties
- Publication
Journal of Materials Science, 2011, Vol 46, Issue 15, p5090
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-011-5438-3