Paper Titles
Compressive Properties and Energy Absorption of Hollow Sphere Aluminum
p.333
Control of Nano-Precipitates in Age-Hardenable Aluminum Alloys and Their Mechanical Properties
p.337
High Speed Roll Casting of Aluminum Alloy Strip
p.343
Interfacial Reaction and Strength of Dissimilar Joints of Aluminum Alloys to Steels for Automobile
p.349
Microstructures and Thermal Stability of the Metastable-Phase Precipitates Formed in an Al-Cu Alloy
p.353
Nano-Scale Clusters Formed in the Early Stage of Phase Decomposition of Al-Mg-Si Alloys
p.357
Study of Precipitation Sequence in Al-Mg-Si Alloys by HRTEM
p.361
The Metastable Phase Responsible for Peak Hardness and Its Morphology in an Al-Mg-Si Alloy
p.365
Dilute Alloy Designs of 7xxx Aluminum Alloys for Thick Forging Applications
p.369

Microstructures and Thermal Stability of the Metastable-Phase Precipitates Formed in an Al-Cu Alloy

Article Preview

Abstract:

The precipitation behavior in an Al-Cu alloy isothermally annealed at 373K～493K was studied, using the Vickers microhardness tests, Differential scanning calorimetry(DSC) and Transmission electron microscope(TEM) observations. An additional endothermic peak was found in DSC measurements which may be attributed to the θ″-phase independent from the formations of the G.P.(Ⅱ) and the θ′-phase at the aging temperatures. High resolution transmission electron microscopy (HRTEM) revealed that the G.P.(Ⅰ) is formed at a very early stage of isothermal aging at 463K. Comparing the Vickers microhardness and TEM images, it was concluded that G.P.(Ⅱ) is mainly responsible for the peak hardness.

You might also be interested in these eBooks
PRICM-5 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

353-356

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.353

Citation:

Cite this paper

Online since:

January 2005

Authors:

Sung Kyu Son, Mahoto Takeda, Takao Endo

Keywords:

Al-Cu, Dye Sensitized Solar Cell (DSSC), Precipitation Behavior, Precipitation Hardening

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] A. Guinier, Ann. Phys. 13, 161(1939).

Google Scholar

[2] G.D. Preston, Phil. Mag. 26, 855(1938).

Google Scholar

[3] J.M. Silcock, T.J. Heal and H.K. Hardy, J. Inst. Metals, 82, 239(1953-4).

Google Scholar

[4] V. Gerold, Z. Metallk. 45, 593(1954).

Google Scholar

[5] D.R. James and G.L. Liedl, Acta Cryst. 18, 678(1965).

Google Scholar

[6] X. Auvray, P. Georgopoulos and J.B. Cohen, Acta Metal. 29, 1061(1981).

Google Scholar

[7] E. Bubeck and V. Gerold, J. appl. Crystal. 19, 164(1986).

Google Scholar

[8] B. Jouffrey and M. Karlik, Microsc. Microanal. Microstruct. 3, 243(1992).

Google Scholar

[9] H. Fujita and C. Lu, Mater. Trans. JIM. 33, 892(1992).

Google Scholar

[10] M. Takeda, Y. Maeda, A. Yoshida and T. Endo, Script. Metal. 40, 643 (1999).

Google Scholar

[11] J.M. Papazian, Metall. Trans. A 12A, 269(1981).

Google Scholar

[12] C.G. Cordovilla and E. Louis, J. Mat. Sci. 19, 279(1984).

Google Scholar

[13] M.J. Starink and P. von Mourik, Mat. Sci. Eng. A156, 183(1992). Figure 6 High Resolution TEM image obtained from Al-1. 94at%Cu aged at 463K for 600s.

Google Scholar