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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.2 (2015)  >  pp.193-199

MATERIALS TRANSACTIONS
<<Previous article Vol.56  No.2 (2015)   pp.193 - 199 Next article>>

Damping Capacities of Ti50Ni50−xCux Shape Memory Alloys Measured under Temperature, Strain, and Frequency Sweeps

Chen Chien1), Shyi-Kaan Wu1) 2), Shih-Hang Chang3)
1) Department of Materials Science and Engineering, National Taiwan University 2) Department of Mechanical Engineering, National Taiwan University 3) Department of Chemical and Materials Engineering, National I-Lan University

The damping capacities of Ti50Ni50−xCux SMAs with x = 0∼20 at% were measured by DMA under temperature, strain and frequency sweep tests. The tan δ value exhibited at B2→B19 transformation is significantly higher than that at B2→B19′ transformation under temperature/strain sweep tests. In the strain sweep test, the tan δ value decreases as the frequency increases, but it increases as the applied strain increases. The tan δ curves of the strain sweep tests can be fitted by tan δ = Kεn with n values being close to the friction type model. Adding Cu enhances the tan δ values of both B19 martensite and B2→B19 transformation in 0.1∼10 Hz, but that of B19′ martensite is enhanced only at 10 Hz. From 0.1 Hz to 1 Hz, the decrement of the tan δ value in IFI term is greater than that in IFPT term for SMA with x ≥ 5 at%. In the frequency sweep test, the tan δ value increases as the x value increases under the same applied frequency, no matter whether the martensite is B19′ or B19.


Keyword:
TiNiCu shape memory slloys, damping capacities, dynamic mechanical analyzer, martensitic transformation, strain/frequency sweep

Received: August 22, 2014
Accepted: November 07, 2014 , Published online: January 25, 2015

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