Metastable structures in metallurgy
- PDF / 1,697,859 Bytes
- 14 Pages / 594 x 774 pts Page_size
- 51 Downloads / 187 Views
Metastable Structures in Metallurgy
DAVID TURNBULL
Metastable structures or, more accurately, configurationally frozen metastable structures are no novelty in metallurgy. Indeed, much of the traditional practice of metallurgy has centered on the formation, characterization, understanding and control of structures which are either compositionally, topologically a n d / o r morphologically metastable. However, in the past two to three decades we have seen a great upsurge in the production and study of new metastable structures in metallurgy, as well as in other condensed phase sciences. This upsurge reflects developments in the techniques of melt quenching, condensation and irradiation of materials, as well as in the kinetic understanding of structure evolution; and it has brought us nearer to making the concept of "ultramolecular engineering" viable. Among the new materials produced are glassy metals, highly supersaturated crystalline alloys and new alloys with exceptionally high interfacial densities. An overview of these new developments will be offered, following a discussion of the principles of metastable structure synthesis.
ALONG
with other members of the present generation of Campbell Lecturers I have had no association with Professor Campbell. I did note, with interest, the
allusion to his contributions in Saveur's article on "Metallurgical Reminiscences" which was reprinted in the Journal o f Metals I about a year ago. From this I
The Edward DeMille Campbell Memorial Lecture was established in 1926 as an annual lecture in memory o f and in recognition o f the outstanding scientific contributions to the metallurgical profession by a distinguished educator who was blind for all but two years o f his professional life. It recognizes demonstrated ability in metallurgical science and engineering.
From 1939 to 1946 Dr. Turnbull was on the faculty of Case Institute of Technology. He was a research scientist at the General Electric Research Laboratory from 1946 to 1962, where he served as manager of the Chemical Metallurgy section from 1950 to 1958. Adjunct professor of metallurgy at Rensselaer Polytechnic Institute from 1954 to 1962, he spent the academic year 1957-58 on leave at Cavendish Laboratory, Cambridge University. He joined the faculty of Harvard in 1962. Dr. Turnbull is a member of the National Academy of Sciences and a Fellow of the American Academy of Arts and Sciences, the American Association for the Advancement of Science, The Metallurgical Society of AIME, and of the American Physical Society. He is co-editor, with Henry Ehrenreich and Frederick Seitz, of the Solid State Physics series. He was Institute of Metals Division (AIME) Lecturer in 1961 and Robert S. Williams (MIT) Lecturer in 1969. He was awarded the von Hippel Prize of the Materials Research Society and the Acta Metallurgica Gold Medal in 1979.
DAVID TURNBULL, Gordon McKay Professor of Applied Physics at Harvard University, has contributed to the fields of nucleation and growth of crystals, diffusion in solids and liquids, solid
Data Loading...
