The Effect of Prestrain on Low Temperature Fatigue Induced Resistivity in Pure Aluminum
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Residual resistivity increases are examined in pure aluminum work hardened at room temperature and then cyclically strained at 4. 2 K. The metal studied has an annealed residual resistivity ratio (RRR equals rho //2//7//3//K/ rho 4//. 2K) of 1000, is swagged conventionally to area reductions of between and 82%, and is taken through 3000 cycles of 0. 1, 0. 2 or 0. 3% strain. Fatigue induced resistivity ( DELTA rho ) is found to be dramatically reduced in prestrained metal when compared to the increase seen in annealed metal. Even though the initial residual resistivity of the work hardened aluminum is higher than that for the annealed case, the final resistivity after cycling is lower for the prestrained metal. The results of this study show that prestrain may provide a way to avoid much of the serious resistivity increase in the stabilizer aluminum used in composite superconductors and cryoconductors subjected to cyclic strain during operation.
Advances in Cryogenic Engineering
author list (cited authors)
Yuan, G. S., Lehmann, P., & Hartwig, K. T.
editor list (cited editors)
Reed, R. P., & Clark, A. F.