Abstract
The role of quenched-in vacancies in altering the time cycle of heat treatment is best exemplified by the process of formation of Guinier-Preston zones. Phase decomposition can be dramatically accelerated by enhanced solute diffusion which results from the high vacancy supersaturation quenched-in attendant to heat treatment. A review is presented of this field from the earliest work through recent developments. Important contributions, principally of a conceptual nature, have come about from quenching studies on pure metals. Impurity additions to these pure metals, as well as to high-purity binary alloys, have led to an understanding of the vacancy-solute binding energy and to the way in which this binding can affect zone formation. The interrelated diffusion of vacancies and of vacancy-solute pairs introduces coupled processes which are complex and need to be considered in a thorough analysis of the problem. Recent theoretical and experimental approaches are examined.
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This paper is based on a presentation made at a symposium on Altering the Time Cycle of Heat Treatment, held at the Philadelphia meeting of The Metallurgical Society of AIME, October 14, 1969, under the sponsorship of the IMD Heat Treatment Committee.
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Herman, H. Altering the time cycle of heat treatment by quenched-ln vacancies. Metall Trans 2, 13–22 (1971). https://doi.org/10.1007/BF02662634
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DOI: https://doi.org/10.1007/BF02662634