A report describes uniaxial-stress-versus-strain experiments that were performed on polycrystalline Tb76Dy24 alloy specimens. [Also see "Magnetoelastic Vibration Dampers" (NPO-20988) on page 56 of this issue.] The proposal is to use Tb-Dy alloys as vibration-damping materials at temperatures -100 K, exploiting the fact that in Tb-Dy alloys and other magnetostrictive materials, vibrations cause the movement of magnetic domains and the consequent dissipation of vibrational energy as heat.
This work was done by Jennifer Dooley, Robert Chave, Brent Fultz, Art Clark, Nathan Good, and Jason Graetz of Caltech for NASA's Jet Propulsion Laboratory.
In accordance with Public Law 96-517, the contractor has elected to retain title to this invention. Inquiries concerning rights for its commercial use should be addressed to
Intellectual Property group
Mail Stop 202-233
4800 Oak Grove Drive
Pasadena, CA 91109
Refer to NPO-20887.