Back to Search Start Over

Retrogression characteristics of a novel Al-Cu-Li-X alloy

Retrogression characteristics of a novel Al-Cu-Li-X alloy

Authors :
Changsheng Li
Sheng-long Dai
Xiuliang Wu
Zhi-shan Yuan
Zheng Lu
You-hua Xie
Source :
International Journal of Minerals, Metallurgy, and Materials. 17:624-628
Publication Year :
2010
Publisher :
Springer Science and Business Media LLC, 2010.

Abstract

Retrogression characteristics of a novel Al-Cu-Li-X alloy of 2A97 were studied by hardness testing, transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The retrogression treatments of aging at 155°C for 12 h followed by aging at 220 and 240°C were chosen by determining the peak temperature of δ′ precipitation at 230°C by DSC. The retrogression treatment at a lower temperature of 220°C causes the precipitation and coarsening of δ′ and θ′ phases in the matrix, resulting in an increase in hardness. Retrogression at a higher temperature of 240°C causes the dissolution and coarsening of δ′ and θ′ precipitates in the matrix and on the grain boundaries, resulting in a decrease in hardness. Microstructural changes upon retrogression including the appearance of equilibrium precipitates such as T1, T2, δ′, and θ are confirmed by the selected area electron diffraction and the bright and dark field image analysis.

Details

ISSN :
1869103X and 16744799
Volume :
17
Database :
OpenAIRE
Journal :
International Journal of Minerals, Metallurgy, and Materials
Accession number :
edsair.doi...........aa1ab9118271722ebaa3cd24a5b92613
Full Text :
https://doi.org/10.1007/s12613-010-0365-x