Orientation mapping
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Orientation Mapping*
F. C. FRANK R.F. Mehl Medalist
This is the lecture I intended to deliver as the Robert Mehl Lecture of the American Metallurgical Society at Denver last February. I do not know how much its somewhat mathematical topic would have appealed to Robert Mehl, but there 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 7922 by distinguished men 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. *This lecture was delivered September 21, 1987 at the 8th International Conference on Textures of Materials, at Santa Fe, NM. Sir CHARLES FRANK is Emeritus Professor of Physics in the University of Bristol, England. He followed his degree in chemistry at Oxford in 1933 with D. Phil. Research at the Engineering Science Laboratory in Oxford on dielectric loss, under the direction of E. B. Moullin, after which he was from 1936 to 1938 in the Kaiser-Wilhelm-Institut ffir Physik under Professor Debye in Berlin. Work in the colloid science laboratory in Cambridge, commenced in 1939, was interrupted by the war, which he spent mainly in air intelligence. In 1946 he was invited by Mott to the physics department of the University of Bristol, which remained his base until he retired, as head of the department, in 1976--but with repeated vacation visits to the metallurgy and materials department of the G.E. Research Laboratory in Schenectady, and nine months (1964-65) as a visiting professor at the physics department and the Institute for Geophysics and Planetary Physics at La Jolla. He was Raman visiting professor at the Raman Research Institute, Bangalore, in 1979-80. He was elected a Fellow of the Royal Society in 1954. He has been chairman of the editorial board of the British Journal of Applied Physics, was one of the founding editors of the Journal of Crystal Growth, and is now one of the editors of Contemporary Physics. His principal work relating to metals has been concerned with crystal dislocations, the theory of crystal growth, and the structure of complex alloy phases. METALLURGICAL TRANSACTIONS A
is one regard in which I feel sure I would have had his sympathy: that of paying respect to our scientific predecessors. I say this because I remember that when I was becoming interested in the theory of crystallization, one of my important sources of knowledge of the experimental facts was Mehl's translation of a book by Tammann. My principal heroes from the past for the present subject are Euler, of course, Rodrigues, Cayley, and Klein. Of these the most unjustly neglected is Olinde Rodrigues, which is something I have come to know in comparatively recent years. The whole subject is one to which I have returned, on and off, learning a little more each time, since it was fi
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