| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1653104 | Materials Letters | 2007 | 4 Pages |
The internal friction and the modulus have been measured on Ti51.5Ni26.0Pd22.5 films under tension load, at three frequencies 0.5, 1.0, 5.0 Hz. in a wide range of temperatures covering the orthorhombic martensite and the reverse transformations. The effect of heat treatment and frequency on the internal friction has also been investigated. Only a transition around the orthorhombic transformation took place and a very sharp step-type internal friction was observed for all films with three kinds of heat treatments. The elastic modulus evolution reversed to internal friction change and a remarkable depression of the modulus corresponded to the internal friction peak. The internal friction of the films was enhanced by crystallization at 750 °C and the highest internal friction obtained at frequency 0.5 Hz. Ageing treatment at 450 °C after crystallizing at 750 °C promoted the peak of internal friction appearing and accelerated the microstructure variation. A high damping capacity of Q− 1 = 0.05 or 0.06 was reached in the films crystallizing at 750 °C with or without ageing at 450 °C respectively and sustained from room temperature to 100 °C.
