Damping properties of ductile Cu-Al-Mn-based shape memory alloys

Naoki Koeda, Toshihiro Omori, Yuji Sutou, Hidekazu Suzuki, Masami Wakita, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


The damping property tan φ of Cu-Al-Mn-based alloys, where tan φ is nearly equal to internal friction Q -1, was investigated using a Dynamic Mechanical Spectrometer (DMS). It was found that the dependences of frequency and strain amplitude on tan φ are significantly different between the parent + martensite two-phase and the martensite single-phase states, i.e., tan φ is mainly influenced by frequency in the two-phase state and by strain amplitude in the martensite state. It was also found that the relative grain size d/D is a function of the damping capacity, where d and D are the grain diameter and the diameter of the wire, respectively, and that tan φ increases with increasing d/D. The maximum values of tan φ = 0.54 and tan φ = 0.07 were obtained in the two-phase state and in the martensite state, respectively, in the specimen of d/D ≈ 1.

Original languageEnglish
Pages (from-to)118-122
Number of pages5
JournalMaterials Transactions
Issue number1
Publication statusPublished - 2005 Jan


  • Copper-aluminum-manganese
  • Damping
  • Grain size
  • Internal friction
  • Martensite variant
  • Martensitic transformation
  • Mobility
  • Shape memory


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