Effects of Mechanical Treatment and Pre-Deformation on Shape Recovery Stress of Ti50Ni47Fe3 Shape Memory Alloy
| Autor: | Yu Zhang, Fu Shun Liu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Alloy % area reduction Reverse transformation Shape-memory alloy engineering.material Condensed Matter Physics Mechanics of Materials Diffusionless transformation Recovery stress engineering General Materials Science Deformation (engineering) Composite material Pre deformation |
| Zdroj: | Materials Science Forum. 787:267-274 |
| ISSN: | 1662-9752 |
| Popis: | Effects of mechanical treatment, pre-strain and pre-deformation temperature on shape recovery stress of Ti50Ni47Fe3 shape memory alloys were investigated. Mechanical treatment, consisting of hot-rolling and hot-forging, improved σrmax σrmax (maximum recovery stress), dσr/dT (rate of recovery stress with temperature) and Ts (the temperature at which recovery stress rises sharply). Martensitic transformation and reverse transformation temperatures also increased with increasing the hot-rolling deformation. σrmax and dσr/dT increased with increasing pre-strain at first and then decreased with further increasing of pre-strain, and the maximum values of σrmaxand dσr/dT were obtained at a pre-strain of 10%. On the other hand, σrmaxand dσr/dT decreased with increasing pre-deformation temperature. Upon a hot-rolling of 88% area reduction and pre-deformation of 10% at-150°C, the Ti50Ni47Fe3 alloy exhibited excellent recovery stress property with the σrmax of 391MPa in combination with dσr/dT of 5.09. |
| Databáze: | OpenAIRE |
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