Creep of pure aluminum at cryogenic temperatures
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Creep properties of high purity aluminum at 4.2 K and 77 K are examined. The testing is done by placing two or three aluminum specimens in series under constant load at a constant temperature and monitoring the time-dependent strain that occurs over a period of 200 hours, or well into the steady-state region of the creep curve. Steady-state creep rates for annealed, 99.99% pure aluminum are on the order of 4 10-12 in/in-sec when tested near the yield strength. The creep system used is also discussed in detail, since no commercial cryogenic system is currently available.
