Behaviour and effect of Ti2Ni phase during processing of NiTi shape memory alloy wire from cast ingot
IR@NAL: CSIR-National Aerospace Laboratories, Bangalore
View Archive Info| Field | Value | |
| Title |
Behaviour and effect of Ti2Ni phase during processing of NiTi shape memory alloy wire from cast ingot
|
|
| Creator |
Bhagyaraj, J
Ramaiah, KV Saikrishna, CN Bhaumik, SK Gouthama, - |
|
| Subject |
Metals and Metallic Materials
|
|
| Description |
Binary NiTi alloy is one of the commercially successful shape memory alloys (SMAs). Generally, the NiTi
alloy composition used for thermal actuator application is slightly Ti-rich. In the present study, vacuum
arc melted alloy of 50.2Ti–Ni (at.%) composition was prepared and characterized using optical, scanning
and transmission electron microcopy. Formation of second phase particles (SPPs) in the cast alloy and
their influence on development of microstructure during processing of the alloy into wire form has been
investigated. Results showed that the present alloy contained Ti2Ni type SPPs in the matrix. In the cast
alloy, the Ti2Ni particles form in varying sizes (1–10 lm) and shapes. During subsequent thermo-
mechanical processing, these SPPs get sheared/fragmented into smaller particles with low aspect ratio.
The presence of SPPs plays a significant role in refinement of the microstructure during processing of
the alloy. During deformation of the alloy, the matrix phase around the SPPs experiences conditions sim-
ilar to that observed in severe plastic deformation of metallic materials, leading to localized amorphisa-
tion of the matrix phase.
|
|
| Publisher |
Elsevier Science SA
|
|
| Date |
2013
|
|
| Type |
Journal Article
PeerReviewed |
|
| Format |
application/pdf
application/pdf |
|
| Identifier |
http://nal-ir.nal.res.in/12047/1/ja462.pdf
http://nal-ir.nal.res.in/12047/2/ja462POST.pdf Bhagyaraj, J and Ramaiah, KV and Saikrishna, CN and Bhaumik, SK and Gouthama, - (2013) Behaviour and effect of Ti2Ni phase during processing of NiTi shape memory alloy wire from cast ingot. Journal of Alloys and Compounds, 581 (Decemb). ISSN 0925-8388 |
|
| Relation |
http://www.sciencedirect.com/science/article/pii/S0925838813016599
http://nal-ir.nal.res.in/12047/ |
|