Symposium on The Massive Transformation
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Metallurgical Transactions A. The purpose of this symposium was to summarize the present position of research on the nature of the massive transformation, and especially, to focus attention upon the major issues currently concerning investigators of this reaction. Professor Hillert discussed the thermodynamics of the massive transformation, emphasizing particularly the problem of whether or not this transformation can take place within a two-phase region. Professors Plichta, Clark, and Aaronson summarized studies on nucleation of the massive transformation and dealt with the question of whether or not the massive product crystals have orientation relationships which permit formation of low energy interfaces with respect to one or more of the matrix grains with which they are initially in contact. Professor Perepezko assembled the considerably larger body of evidence on the growth kinetics of the massive product, paying particular attention to the role of interphase boundary structure in the growth process; and Professor Massalski provided an overview of the field as a whole, pointing out in the process fundamental problems of particular importance. We hope that, despite the regrettable lateness with which these proceedings have appeared in print, the four papers which follow constitute a useful overview of this fascinating research area, and a still reasonably current summary of the current state of understanding of its basic aspects. We would like to dedicate these proceedings to Dr. Tadeusz B. Massalski, Professor of Metallurgical Engineering and Materials Science and Professor of Physics at Carnegie-Mellon University. Since the publication of his first paper on this subject in 1958 ("The Mode and Morphology of Massive Transformations in Cu-Ga, Cu-Zn, Cu-Zn-Ga and Cu-Ga-Ge Alloys", Acta Metallurgica, volume 6, pp. 243-253), Professor Massalski and his numerous co-workers have worked almost continuously for more than 20 years on this subject. The many papers resulting from these investigations provide a large fraction of our present knowledge of the massive transformation. Of equal importance, their studies have persuaded other workers to recognize and study the massive transformation in a wide range of alloy systems. Primarily as a result of the contributions of Professor Massalski and his colleagues, the massive transformation is now recognized as one of the principal reactions through which metals and alloys transform in the solid state. The broad scope and the depth of the present set of papers--and the great vigor of the public discussions which followed each paper at the Pittsburgh Symposium--provide appropriate tributes to the value of Professor Massalski's efforts. We also wish to express our appreciation to Dr. Alan H. Rosenstein of the Air Force Office of Scientific Research for funding both our joint studies of the massive transformation and for supporting the organization of this symposium. Mark R. Plichta Department of Materials Science and Engineering University of Utah Hubert I. Aaronson Department
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