High Strength-High Damping Capacity Wrought Magnesium Alloys
Technical research rept.
FRANKFORD ARSENAL PHILADELPHIA PA
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An investigation was carried out to provide information regarding the alloying elements and the strengthening processes that must be utilized to obtain wrought magnesium alloys having high strength and high damping capacity for use in structural applications in missiles and aircraft. To this end, wrought magnesium alloys containing such solute elements as Al, Cd, In, Li, Mn, Pb, Y, Zn, and Zr were prepared and evaluated with respect to strength and damping capacity. The commercial alloy, AZ31, composite materials of magnesium containing borsic fibers, and a magnesium alloy strengthened by MgO particles were also evaluated. The effects of solute type and concentration, degree of cold work and grain size on the damping capacity of the alloys were investigated. An inverse relationship exists between damping capacity and the strength of the materials. This relationship holds for different types and concentrations of solute and for different degrees of cold work. The significance of this relationship is discussed. The Mg-Cd, Mg-Mn and Mg-Zr alloys have the highest damping capacity of the alloys investigated. Possible mechanisms for the strength-damping capacity behavior in wrought magnesium alloys are presented.
- Metallurgy and Metallography