Abstract
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 language | English |
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Pages (from-to) | 118-122 |
Number of pages | 5 |
Journal | Materials Transactions |
Volume | 46 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2005 Jan |
Keywords
- Copper-aluminum-manganese
- Damping
- Grain size
- Internal friction
- Martensite variant
- Martensitic transformation
- Mobility
- Shape memory
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering