摘要
Alloying and spray deposition technique were adopted to improve the the service temperature limitation of the alloy ZA27 in an effort to develop a new functional material with high damping capacity and good elevated temperature mechanical property. The effects of addition of 5 wt pct of Si on the damping behavior and elevated temperature creep resistance of alloy ZA27 were investigated. The damping capacity, as well as the relative dynamic modulus, were measured at frequency of 1.4 Hz over the 303 to 573 K. No peak phenomenon was observed for the specimens tested in the temperature range of interest. Experimental results indicate that the damping capacity of the deposited material is 2.8 times higher than that of the cast one at 305 K. The ball hardness values were used to evaluate the creep property and the creep activation energy of the deposited material is 3.9-5.7 kJ per mol higher than that of the as-cast one. The creep rate formulation was also derived. Finally, The operative damping and creep mechanisms were discussed in the light of the data obtained from its characterization of microstructure, damping capacity and creep resistance. (Edited author abstract) 12 Refs.
Alloying and spray deposition technique were adopted to improve the the service temperature limitation of the alloy ZA27 in an effort to develop a new functional material with high damping capacity and good elevated temperature mechanical property. The effects of addition of 5 wt pct of Si on the damping behavior and elevated temperature creep resistance of alloy ZA27 were investigated. The damping capacity, as well as the relative dynamic modulus, were measured at frequency of 1.4 Hz over the 303 to 573 K. No peak phenomenon was observed for the specimens tested in the temperature range of interest. Experimental results indicate that the damping capacity of the deposited material is 2.8 times higher than that of the cast one at 305 K. The ball hardness values were used to evaluate the creep property and the creep activation energy of the deposited material is 3.9-5.7 kJ per mol higher than that of the as-cast one. The creep rate formulation was also derived. Finally, The operative damping and creep mechanisms were discussed in the light of the data obtained from its characterization of microstructure, damping capacity and creep resistance. (Edited author abstract) 12 Refs.
