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Creep tests were made in tension under co nstant loads at temperatures of 300°, 700°, and 900° F on ini tiaJly annealed specimens of nickel, copper, and 70-percen t-nickel30-percent-cappel' and 30-percent-nickel-70-percent-copper alloys. Tests at 1,200° F were also mad e on the nick el and th e two alloys, bu t not on the annealed copper as the resistance to creep of copper is relatively low at this temperature. The investigation included a study of the influence of rate of loading on the creep stress and of prior t h ermal-mec hanical history on the creep behavior of the alloys at several selected temperatures. Contour and hardness surveys and metallographic examinations were also carried out on some of the frae tured s pecimens to ascertain the effect of creep on the necking characteristics, hardn esses, and structures of the metals.

Creep of annealed nickel, copper, and two nickel-copper alloys