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The early stages of solute distribution below a transition temperature

  • The 1992 Institute of Metals Lecture the Minerals, Metals and Materials Society
  • Published:
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Abstract

We now recognize that there are many possibilities for decomposition: ordering in the matrix followed by precipitation, decomposition followed by ordering, transition phases,etc. Both energetic and kinetic factors can cause such sequences. The formation of coherent phases in some Al, Cu, and Au systems is reviewed. A simpler understanding of Guinier-Preston (GP) zone development in these alloys has emerged. Also, it is not clear that homogeneous nucleation occurs at all in most systems, either in precipitation or on ordering, because fluctuating regions, like the low-temperature phase, are often present in the solid solution about the solvus. Further-more, coherency strain may play an important role in the beginnings of these phase transfor-mations, controlling whether precipitation or ordering or even displacive transformation occurs, and may strongly affect the coherent phase diagram.

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Authors and Affiliations

  1. Robert R. McCormick School of Engineering, and Engelhart Professor of Materials Science, Northwestern University, 60208, Evanston, IL

    J. B. Cohen R.F. Mehl Medalist (Dean)

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  1. J. B. Cohen R.F. Mehl Medalist
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Additional information

The Institute of Metals Lecture was established in 1921, at which time the Institute of Metals Division was the only professional division within the American Institute of Mining and Metallurgical Engineers. It has been given annually since 1922 by distinguished people from this country and abroad. Beginning in 1973 and thereafter, the person selected to deliver the lecture will be known as the “Institute of Metals Division Lecturer and R.F. Mehl Medalist” for that year.

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Cohen, J.B. The early stages of solute distribution below a transition temperature. Metall Trans A 23, 2685–2697 (1992). https://doi.org/10.1007/BF02651749

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