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Vol.23, No.6, 583 ~ 590, 1985
Title
Changes of Damping Capacity Associated with cold working in High Damping Mn - Cu Alloys
최광재Kwang Chae Choe, 조현기Hyun Ke Cho
Abstract
Effects of cold working on the damping capacity in Mn-30Cu, Mn-40Cu wt.% and one of multielement Mn-Cu alloy aged at 425℃ for 2hr after quenching from 850℃ were studied by varying the amount of cold working. Measurements of damping capacity were carried out by torsional pendulum method. Cold working by rolling caused a decrease in damping capacity but subsequent 425℃ reaging could increase the damping capacity. Also by cold working, the mechanical properties such as hardness and tensile strength were increased. Temperature dependence of damping capacity was also investigated. Most of high damping capacity peaks were found in the range of 40 to 140℃ on Mn-30Cu and Mn-40Cu, but in multielement sample the damping capacity was decreased by raising temperature. The activation energies for twin boundary relaxation process were 1.44-1.94×10⁴J/g·atom in Mn-30Cu and 1.80-3.66×10⁴J/g·atom in Mn-40Cu alloy.
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