Abstract
The porous Ti-50.8 at.% Ni shape memory alloys (SMAs) were successfully fabricated by capsule-free hot isostatic pressing (CF-HIP) method. The phase transformation behaviors of the fabricated porous NiTi SMAs with various porosity ratios were investigated. It was seen that the porous alloys show a uniform pore distribution with the spherical pore size ranging mainly from 50 to 200 μm. And their phase transformation behaviors are similar to that of conventional cast dense Ni-rich TiNi alloys. It has also been seen that phase transformation during cooling process occurs by two steps, that is, R-phase transformation and B19′ martensitic transformation, respectively. In addition, it was also found that the pores have a significant influence on B19′ martensitic transformation, while little influence on R-phase transformation. The characteristic transformation temperatures and latent heats of B19′ martensitic transformation in porous Ti-50.8 at.% Ni SMAs were found to decrease with increasing porosity ratio. © 2006 Elsevier B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 585-588 |
| Journal | Materials Science and Engineering A |
| Volume | 438-440 |
| Issue number | SPEC. ISS. |
| DOIs | |
| Publication status | Published - 25 Nov 2006 |
Research Keywords
- Capsule-free hot isostatic pressing
- Phase transformation
- Porosity ratio
- Porous TiNi
- Shape memory alloys
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