Hostname: page-component-6bf8c574d5-mcfzb Total loading time: 0 Render date: 2025-03-09T23:19:47.899Z Has data issue: false hasContentIssue false
  • English
  • Français

Precipitation Kinetics in an Air-Cooled Aluminum Alloy: A Comparison of Scanning and Isothermal Calorimetry Measurement Methods

Published online by Cambridge University Press:  10 February 2011

George W. Smith
George W. Smith*
Affiliation:
Physics and Physical Chemistry Department, General Motors Research & Development Center, Warren, MI 48090-9055, [email protected]
Get access

Abstract

The purpose of this work is to study precipitation kinetics in air-cooled aluminum alloy 339 by both differential scanning calorimetry (DSC) and differential isothermal calorimetry (DIC) and thereby establish the equivalence of the two methods. To accomplish this, precipitation time constants, τ and activation energies, Eact, were determined by both techniques. Kissinger analysis of the DSC data yielded Eact and τ values. Using DIC we measured precipitation time constants, Arrhenius plots of which gave Eact. Activation energies and τ values from both methods agree provided DSC temperature scan rates are slow compared to the instrumental lag time. Thus, DSC and DIC have been shown to be equivalent (at least for this test case).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 327
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Papazian, J. M., Met. Trans. 12A, p. 269 (1981). (See other citations in references 1–10).Google Scholar
2. Rooyan, M. Van, Maartensdijk, J. A. Sinte, and Mittemeijer, E. J., Met. Trans. 19A, p. 2433 (1988).Google Scholar
3. Jena, A. K., Gupta, A. K., and Chaturvedi, M. C., Acta. Metall. 37, p. 885 (1989).Google Scholar
4. Starink, M. J. and Mourik, P. Van, Met. Trans. 20A, p. 665 (1991).Google Scholar
5. Dutta, I., Harper, C. P., and Dutta, G., Metallurg. and Materials Trans. 25A, p. 1591 (1994).Google Scholar
6. Badini, C., Marino, F., and Verne, E., Mat. Sci. and Eng. A191, p. 185 (1995).Google Scholar
7. Kissinger, H. E., Anal. Chem. 29, p. 1702 (1957).Google Scholar
8. Mittemeijer, E. J., Cheng, L., Schaaf, P. J. van der, Brakman, C. M., and Korevaar, B. M., Met. Trans. 19A, p. 925 (1988).Google Scholar
9. Yinnon, H. and Uhlmann, D. R., J. Non-Crystalline Solids 54, p. 253 (1983).Google Scholar
10. Sestak, J., in Comprehensive Analytical Chemistry, Vol. XII, Part D, Chapter 9, edited by Svehla, G., (Elsevier, Amsterdam, 1984), p. 212.Google Scholar
11. Smith, G. W., Mol. Cryst. Liq. Cryst. 180B, p. 201 (1988); ibid, 196, p. 89 (1991); ibid, 239, p. 63 (1994).Google Scholar
12. Smith, G. W., Int. J. Modem Phys. B7, p. 4187 (1993).Google Scholar
13. Smith, G. W., Scripta Met. et Mat. 31, p. 357 (1994); Thermochimica Acta 291, p. 59 (1997).Google Scholar
14. Guinier, A., Nature 142, p. 569 (1938); G. Preston, Proc. Roy. Soc. A167, p. 526 (1938).Google Scholar
15. Smith, G. W., Thermochimica Acta (in press).Google Scholar
16. Cassell, B., Perkin-Elmer Corp. (private communication).Google Scholar
17. Constraints on S have also been discussed in ref. 2 where scan rates of 5 to 40 °C min-1 are used. Their peaks are broader than ours; thus their S values are consistent with our eq. (4).Google Scholar
18. Mishra, R. K. (private communication) has observed 3 or 4 precipitate phases.Google Scholar
19. Castellan, G., Physical Chemistry, Addison-Wesley, Reading, MA, 1964, p. 614.Google Scholar
20. Chen, L. C. and Spaepen, F., Nature 336, p. 366 (1988); F. Spaepen and C. V. Thompson, Appl. Surf. Sci. 38, p. 1 (1989). [The latter paper compares DSC with non-calorimetric isothermal results.]Google Scholar
21. Chen, L. C., Spaepen, F., Robertson, J. L., Moss, S. C., and Hiraga, K., J. Mater. Res. 5, p. 1871 (1990).Google Scholar
22. Chen, L. C. and Spaepen, F., J. Appl. Phys. 69, p. 679 (1991).Google Scholar
23. Wang, H. G., Herman, H., and Liu, X., J. Materials Sci. 25, p. 2339 (1990). [These authors compare DSC with isothermal X-ray results.]Google Scholar
24. Chen, L. C. and Spaepen, F., Phil Mag. B63, p. 585, (1991); reply by Johari and Ram, ibid, p. 586. See also S. Ram and G. P. Johari, Phil. Mag. B61, p. 299 (1990).Google Scholar