The Fatigue and Tensile Properties of Dispersion Strengthened Copper at Low Temperatures (77 to 295K)
High-field pulsed-magnets are subject to high operational forces and rapid temperature excursions. These magnets typically are precooled to 77 K and experience a temperature rise to about room temperature in times of 100 ms or less. Peak stresses in the magnet windings coincide with a temperature of about 195 K and are limited only by the magnet performance requirements or the strength of the materials used. Alumina dispersion strengthened copper alloys (D.S. coppers) have been proposed for pulsed magnet applications as a replacement for the heavily cold-worked, unalloyed coppers presently used for the windings. Here we report the results of mechanical testing of three dispersion strengthened copper alloys having alumina contents ranging from 0.3 to 1.1 wt. %. Specifically, we have evaluated the tensile properties of these alloys and their fatigue lives (S-N) near the low cycle regime. Properties are reported for several temperatures intermediate to 77 K and 300 K, including 195 K.
KeywordsFatigue Life Ultimate Tensile Strength Copper Alloy C15725 Alloy Fatigue Test Result
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- 1.J. Robles, K.R. Anderson, J.R. Groza and J.C. Gibeling, “ Low cycle fatigue of dispersion strengthened copper” Metall. Trans. Vol. 25A pp 20–35, Oct.1994Google Scholar
- 2.A.V. Nadkarni: in High Conductivity Copper and Aluminum Alloys, Ling and Taubenblat, eds., The Metallurgical Society of AIME, Warrendale, PA, 1984, pp. 77–101Google Scholar
- 3.A. Singhal, J.F. Stubbins, B.N. Singh, F.A. Garner, “ Room temperature fatigue behavior of OFHC copper and CuA125 specimens of two sizes” Journal of Nuclear Materials 1994, DoE Contract DE-AC06–76RLO 1830Google Scholar
- 4.N.J. Simon, E.S. Drexler, and R.P. Reed “Properties of Copper and Copper Alloys at Cryogenic Temperatures”, NIST Monograph 177, (1992).Google Scholar
- 5.G.E. Dieter, “Mechanical Metallurgy”, 2nd edition, McGraw-Hill Book Company, (1976).Google Scholar
- 6.R.P. Reed and A.F. Clark eds., “Materials at Low Temperatures”, American Society for Metals, 1983, pp. 240–246Google Scholar