Electrical and Mechanical Behavior of Micro-Alloyed Aluminum (RRR>2500) at 4.2 K
The electrical and mechanical properties of micro-alloyed high purity aluminum are examined as a function of cyclic strain (±0.1%) at 4.2 K. The base metal purity is 99.9998% (RRR ≈ 10500) and the levels of micro-alloying (4 to 90 wppm) are such that the nominal RRR values range from about 2500 to 10000. Five different alloying elements (B, Ca, Ce, Ga, and Y) are examined with up to four solute levels for each element (in binary alloys). In addition to the results of cyclic testing, a discussion of the effects of micro-alloying on resistivity degradation and strain hardening is given. The results show that the effects of micro-alloying at levels of about 20 wppm are beneficial. The results also show that the benefits of micro-alloying are closely related to behavior through a solute atomic weight effect; on an atomic ppm basis, the solute atomic weight is more important than the solute type. In addition, resistivity coefficients of the micro-alloying elements and flow stress values at 0.001 strain are given.
KeywordsFlow Stress High Purity Aluminum Superconducting Magnetic Energy Storage Cottrell Atmosphere Cyclic Plastic Strain
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