Conveners
M1Or1C: Metallic, Ceramic, Composite and Polymeric Materials I
- Robert Walsh (NHMFL - Florida State University)
- Norimitsu Koga (Kanazawa University)
We have been investigating whether mixing organic olefin-based thermosetting dicyclopentadiene (DCP) resin, commercially available as TELENE by RIMTEC Corporation in Japan, with high heat capacity ceramic powders, increases the specific heat (Cp) of impregnated Nb3Sn superconducting magnets. This is ongoing as the international scientific collaboration between U.S. and Japan. Using a high Cp...
The high-cycle fatigue properties of ASME standard XM-19 (ASTM A240) austenitic stainless steels (22Cr-12Ni-(Mn, Mo, Nb, V, N), in mass%) have been examined at 77 K. The steel is strengthened by nitrogen solid-solution and grain refinement with (Nb,V) precipitates, and shows the advantages of high strength at cryogenic temperature and excellent weldability. In this study, the fatigue strength...
Effective reinforcement materials require both a high value for tensile strength and a high modulus of elasticity in order to provide a high capacity for load bearing and a high resistance to deformation under external force. At cryogenic temperatures, both strength and modulus are usually amplified. For applications, properties at both temperatures have to be characterized. We have...
Ultrahigh conductivity Al (Al hyperconductors, RRR ~10^4) can be considered as an alternative to superconductors for cryogenic AC applications e.g. in the stators of electric aircraft fan motors. Such conductors can be much better than normal state wires, and competitive with superconductors in certain frequency bands. On the other hand, the low yield strength of such a material renders a...
Suborbital aerospace, orbital, and lunar power distribution networks are desiring lightweight electrical conductors. Cryogenic hyperconducting aluminum (99.9999%+ pure) is a competitive option to HTS cables at lower temperatures below 20 K due to its high RRR, but hyperconducting aluminum cables require mechanical reinforcement for many applications, reducing current density, and this...
We investigated the microstructures achievable by severe plastic deformation processing of copper-tantalum powder composites with a Ta volume fraction ranging from 0.25 to 0.75 by sintering. Additional composites of the same tantalum content were prepared with a minor addition of titanium, added to facilitate interphase bonding. The sintered composites were extruded via several ECAE routes,...
