The nature and role of incoherent interphase interfaces in diffusional solid-solid phase transformations
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PREAMBLE This Symposium has been organized within the framework of a series of symposia honoring the winners of the annual TMS Hume-Rothery award, and in commemoration of the many seminal contributions to the understanding of the stability of metals and alloys made by the late Professor Hume-Rothery. On the occasion of this symposium, we wish to congratulate Professor Hub Aaronson, the current Hume-Rothery Award winner, for his many contributions to the field of phase transformations. One of the authors of this paper (TBM) had known HumeRothery over many years. Perhaps a few brief remarks about Professor Hume-Rothery’s life and achievements are in order. William Hume-Rothery was born in 1899 and spent almost all of his scientific career as a Royal Society Fellow, and later as Professor and Head of Department in the discipline of Metallurgy/Materials in Oxford. During his early boyhood, he was originally destined to follow a military career, but at age 18, he contracted cerebral spinal meningitis that left him totally deaf. This event turned Hume-Rothery toward a scientific carrier of a life-long research into the properties of metals and alloys. He managed to contribute many outstanding ideas that have made a permanent impact on the field of materials science.[1,2] Despite his tremendous hearing handicap, Hume-Rothery lectured well without being able to hear a single spoken T.B. MASSALSKI and D.E. LAUGHLIN, Professors, are with the Materials Science and Engineering Department, Carnegie Mellon University, Pittsburgh, PA 15213. Contact e-mail: [email protected] W.A. SOFFA, Professor, is with the Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22904. This article is based on a presentation made in the “Hume-Rothery Symposium on Structure and Diffusional Growth Mechanisms of Irrational Interphase Boundaries,” which occurred during the TMS Winter meeting, March 15–17, 2004, in Charlotte, NC, under the auspices of the TMS Alloy Phases Committee and the co-sponsorship of the TMS-ASM Phase Transformations Committee. METALLURGICAL AND MATERIALS TRANSACTIONS A
word. To accomplish this, he would invite an associate to sit in the front row and give him hand signals indicating the level and pitch of his voice. His many statements and approaches to controversial issues, or disagreements, are well known to his colleagues. His attitude may well be paraphrased as follows: “. . . if there are a number of experimental facts, and if even one of them does not fit into the existing theory, then reject the theory, or modify it to fit all the facts.” This motto seems particularly fitting to the topic and the contents to this symposium. I. INTRODUCTION
THE present contribution has originated from an initial invitation by Professor Aaronson to have a paper in the symposium that would be presented “. . . as the last talk in which . . . the incoherency view on the structure of irrational interface boundaries would be represented . . .”. It is very satisfying to us that the “incoherency view” ha
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