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Results are reported of a six-month study, ending March 1976, on candidate materials for superconducting machinery. The results cover five areas--advanced composites, elastic properties, fatigue resistance, fracture toughness, magnetothermal conductivity, and thermal conductivity. Material properties were studied over the temperature range 4 to 300/sup 0/K. Materials studied include: aluminum alloys 1100, 2014, 2219; a nickel--chromium--iron alloy; iron--47.5 nickel; and the composite materials boron/aluminum, boron/epoxy, S-glass/epoxy; and graphite/epoxy. Some notable results of the study are as follows: first reports of compressive mechanical testing on composite materials at 4/sup 0/K; regular temperature behavior of the elastic constants of aluminum 2014 and 2219 and of iron--47.5 nickel, which is magnetic; none of the mechanical properties of the nickel--chromium--iron alloy tested were affected deleteriously by cryogenic temperatures; in aluminum alloy 2219, J/sub I/sub c/ and K/sub I/sub c/are not equivalent because of sub-critical crack extension; both electrical and thermal conductivities of aluminum alloy 1100 are reduced by magnetic fields. (GRA)

Semi-annual report on materials research in support of superconducting machinery