Cyclic-Strain Resistivity in Pure Aluminum at 20 K
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Strain induced resistivity increases are examined in nominal 99.99 and 99.999% pure aluminum under conditions of cyclic strain at 20 K. Samples having residual resistivity ratios (RRR = ρ(273 K)/ρ(4.2 K)) of 1000, 2420 and 9440 were prepared by cold working and annealing bars originally 25.4 mm in diameter. Constant strain range (εr) tests were performed for 0.05%<εr<0.3% through 3000 strain cycles. Discussions of the effects of strain range, strain temperature (20 K vs. 4.2 K) work hardening and post cyclic strain annealing on the cyclic-strain induced resistivity increase are presented.
author list (cited authors)
Hartwig, K. T., Lumbis, A., & Roelli, J.
editor list (cited editors)
Reed, R. P., & Fickett, F. R.
Advances in Cryogenic Engineering Materials