| Effect of non-metallic inclusion size on phase transformation temperature in NiTi shape memory alloy in terms of VIM casting |
| Paper ID : 1447-UFGNSM-FULL |
| Authors: |
|
omid mohammadtaheri *1, mehdi alizadeh2, yahya palizdar3 1karaj - sepah square - jomhoori avenue -hejrat street - hejrat 4 - alborz building - no.2 21-material and energy research center 2-Department of Material Engineering, Isfahan University of Technology, PO Box 84156-83111, Alizadeh@cc.iuc.ac.ir 3material and energy research center |
| Abstract: |
| NiTi is categorized as a shape memory alloys (SMAs) that found interesting applications in a wide range of engineering such as, aerospace and biomedical applications i.e. orthopedic implants , orthodontic implants , smart guide wires, surgical instruments and cardiovascular. In this study, effects of size and volume fractions of non-metallic inclusions on the phase transformation temperature in NiTi microstructure alloy were investigated. The NiTi alloy samples were produced by vacuum induction melting (VIM) with 100 gr capacity. The furnace is include of graphite crucible and NiTi was casted in water cooled copper mold. Type of fine-grained and size of the inclusions were characterized by Scanning Electron Microscopy. Results are shown that carbon combined with Ti as TiC is the major source of impurities and inclusions. Three different specimens from the as cast billet was chosen for DSC test. These samples were got from different parts of the as cast billet. Results demonstrated that the phase transformation temperature of these specimens was not in a constant temperature because the size and volume fraction of the inclusions was not equal between the three specimens. All in all, Results confirmed that the size of the inclusions had an important role on the phase transformation temperature. |
| Keywords: |
| Inclusion Size, Phase Transformation Temperature, NiTi Shape Memory Alloys |
| Status : Paper Accepted (Poster Presentation) |
