70:, to study the effects produced in solids by irradiation. One of his many contributions was the measurement of the self-diffusion activation energy of uranium, which was used to calculate the change in the shape of the cylindrical uranium slugs in the Hanford plutonium-producing reactors. After the war, the new Office of Naval Research in 1947 began to support his work on plastic deformation. In 1949, Koehler was invited to join the new Illinois department program in condensed matter physics. Koehler moved his Navy equipment to Urbana, and ONR support continued through 1970. Upon his arrival, substantial support from the Atomic Energy Commission began for a program in radiation damage, which used the Illinois cyclotron. Later his dream was realized to have a dedicated facility for “simple” radiation damage (2 MeV electrons) in the new Illinois Materials Research Laboratory.
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underlying dislocation dynamics. Almost nobody believed
Koehler’s 1952 prediction of L and L loop segment length dependence of the elastic modulus and internal friction, respectively, until 1956 measurements by Thompson and Holmes of Oak Ridge National Laboratory showed it to be correct. Thereafter, this signature became the standard for identifying dislocation losses, and one of the most sensitive detectors of interstitials available.
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Koehler supervised 7 doctoral dissertations at
Carnegie Tech (now called Carnegie Mellon University) and 38 doctoral dissertations at the University of Illinois Urbana-Champaign, where he was a faculty member from 1949 until his retirement as professor emeritus in 1981. He was elected in 1949 as a
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His name is easily attached to some fundamental properties of defects in crystals. The Peach-Koehler formula gives the basic relation now widely used for the force on a dislocation in terms of an applied stress and the
Vibrating String Model is the first formulation of the equation of motion
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Cooper, H.G.; Koehler, J.S.; Marx, J.W. (1954). "Resistivity
Changes in Copper, Silver, and Gold Produced by Deuteron Irradiation Near 10° K".
30:) was an American physicist, specializing in metal defects and their interactions. He is known for the eponymous Peach-Koehler stress formula.
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Koehler is also known for the Cooper-Koehler-Marx experiment, the
Magnuson-Palmer-Koehler experiment, and the Bauerle-Koehler experiment.
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Oral history interview with James
Koehler on 6 March 1981, American Institute of Physics, Niels Bohr Library & Archives
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Magnuson, G.D.; Palmer, W.; Koehler, J.S. (1958). "Isothermal annealing below 60 K of deuteron irradiated noble metals".
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Peach, M.; Koehler, J.S. (1950). "The forces exerted on dislocations and the stress fields produced by them".
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Fellow of the
American Physical Society. For the academic year 1956–1957, he was a Guggenheim Fellow at the
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Koehler received 1935 his bachelor's degree from
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His original focus was on plastic waves in metals upon impact. By 1944 Koehler joined the
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Pittsburgh, he became a physics instructor at Carnegie Tech in early 1942.
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Bauerle, J.E.; Koehler, J.S. (1957). "Quenched-in
Lattice Defects in Gold".
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Several of Koehler's doctoral students were elected Fellows of the
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John Simon Guggenheim Foundation | James Stark Koehler
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