ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The stir-casting method was utilized in this paper to synthesize 6063Al/Al2O3·SiO2reinforced composites consisting of 6063Al alloy as matrix and Al2O3·SiO2 particles as additive withcontent of 5%, 10%, 15%, 20% (volume fraction) respectively. Al2O3·SiO2 particles were obtainedfrom fly ash particles of Steam Power Plant and were pretreated. The shape of these fly ash particleswas spheroidal and ellipsoidal. The damping behavior of 6063Al/Al2O3·SiO2 particle reinforcedcomposites was studied by measuring the composite’s internal friction values on a MultifunctionalDamping Measurement Apparatus. Under the condition of this series of experiments,6063Al/Al2O3·SiO2 particle reinforced composites had a higher internal friction values than that of6063Al matrix and also showed the dependency of internal friction on Al2O3·SiO2 particles volumefraction, particles dimension, vibration frequency and temperature. There was an increased trend forinternal friction values with increasing the volume fraction of Al2O3·SiO2 particles and decreasingparticles dimension of Al2O3·SiO2 at the same frequency and the different temperature. It has beenfound that in the lower frequency, the higher internal friction value was obtained. The internal frictionof the composites increased with increasing temperature. In the case of lower frequency, two dampingpeak were observed. A low-temperature damping peak appeared at a temperature near 245°C which ahigh-temperature damping peak appeared near 450°C. Based on the experimental results, thedamping mechanism of 6063Al/Al2O3·SiO2 particle reinforced composites was preliminarydiscussed. It may be concluded that the damping mechanisms associated with 6063Al/Al2O3·SiO2reinforced composites include mainly intrinsic damping, dislocation damping and interface damping.However, only the interface damping mechanism is dominant at high temperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.633.pdf
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