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.
author list (cited authors)
McDonald, L. C., & Hartwig, K. T.