Damping characteristics of Ti{sub 50}Ni{sub 49.5}Fe{sub 0.5} and Ti{sub 50}Ni{sub 40}Cu{sub 10} ternary shape memory alloys
- Feng Chia Univ., Taichung (Taiwan, Province of China). Dept. of Materials Science
- National Taiwan Univ., Taipei (Taiwan, Province of China). Inst. of Materials Science and Engineering
The damping characteristics of Ti{sub 50}Ni{sub 49.5}Fe{sub 0.5} and Ti{sub 50}Ni{sub 40}Cu{sub 10} ternary shape memory alloys (SMAs) have been systematically studied by resonant-bar testing and internal friction (IF) measurement. The damping capacities of the B19{prime} martensite and the B2 parent phase for these ternary alloys are higher than those for the Ti{sub 50}Ni{sub 50} binary alloy. The lower yield stress and shear modulus of these ternary alloys are considered to be responsible for their higher damping capacity. For the same ternary alloy, the B19/BI9{prime} martensite and R phase also have a higher damping capacity than does the B2 {r_arrow} R, R {r_arrow} B19{prime}, and B2 {r_arrow} B19{prime}, B2 {r_arrow} B19{prime} for Ti{sub 50}Ni{sub 50} and Ti{sub 50}Ni{sub 50} and Ti{sub 50}Ni{sub 49.5}Fe{sub 0.5} alloys, the damping capacity peaks appearing in the resonant-bar test are attributed to both stress-induced transformation and stress-induced twin accommodation. The lattice-softening phenomenon can promote the stress-induced transformation and enhance the damping capacity peaks. The Ti{sub 50}Ni{sub 40}Cu{sub 10} alloy had an unusually high plateau of damping capacity in the B19 martensite, which is considered to have arisen from the easy movement of twin boundaries of B19 martensite due to its inherently very low elastic modulus. The peaks appearing in the IF test for the Ti{sub 50}Ni{sub 40}Cu{sub 10} alloy are mainly attributed to the thermal-induced transformation due to {dot T} {ne} 0 during the test.
- OSTI ID:
- 42858
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 4 Vol. 26; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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