Damping behavior of mechanically alloyed aluminum and aluminum matrix composites

Ram B. Bhagat, Maurice F. Amateau, C. Smith Edward

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The damping capacity of 6061 Al, mechanically alloyed Al-Mg alloy, and SiC particulate-reinforced Al-Cu alloy matrix composites has been investigated. The logarithmic decrement of freely decaying resonance oscillations of clamped-free cantilever beam specimens was measured over a wide range of resonant frequencies (300 Hz-12,000 Hz) in the first three modes of flexure. Damping capacity of the SiC particulate-reinforced Al-Cu alloy matrix composite exhibits a peak at about 1,318 Hz with a loss factor of 0.00352. Peak damping is 2.43 times and 2.82 times the damping capacity of the mechanically alloyed Al-Mg alloy and 6061 Al, respectively, at the same resonant frequency. At frequencies higher than 1,318 Hz, there is no significant difference in the damping response of the materials. The existence of the damping peak is unique to the particulate composite. A mechanism is proposed to explain the large energy dissipation causing the peak.

Original languageEnglish (US)
Pages (from-to)311-316
Number of pages6
JournalInternational Journal of Powder Metallurgy (Princeton, New Jersey)
Issue number4
StatePublished - Oct 1989

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Industrial and Manufacturing Engineering


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