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Remarkable superelasticity of sintered Ti–Nb alloys by Ms adjustment via oxygen regulation
- Source :
- Materials & Design, Vol 87, Iss, Pp 466-472 (2015)
- Publication Year :
- 2015
- Publisher :
- Elsevier, 2015.
-
Abstract
- Nickel-free Ti–Nb alloys were fabricated by conventional powder metallurgy sintering method. The oxygen content of sintered Ti–Nb alloys were successfully decreased to around 0.8 wt.% by putting TiH2 powders aside the samples during the sintering process. For the first time, the phase transformation behaviors of these sintered Ti–Nb alloys were observed by differential scanning calorimetry (DSC) measurement. The relationship between martensitic transformation start temperature (Ms) and mechanical properties, including elastic modulus and recoverable strain, was established by compression tests carried out at room temperature. While Ms was close to test temperature, an obvious drop of elastic modulus was observed, which was related to the “β-α” transformation. In the meantime, a remarkable recoverable strain as high as 5% was obtained at room temperature, which is the highest value reported in sintered Ti–Nb alloys until now. The results of this study reveal that the recoverable strain can be further improved by adjusting Ms close to the service temperature, which was neglected in the reported studies before and will provide some guidance for the future design and fabrication of porous Ni-free Ti-based shape memory alloys for biomedical application. Keywords: Sintered titanium alloy, Superelasticity, Oxygen content, Martensitic transformation, Biomedical alloy
- Subjects :
- Materials science
Mechanical Engineering
Metallurgy
Sintering
Shape-memory alloy
Differential scanning calorimetry
Mechanics of Materials
Powder metallurgy
Diffusionless transformation
Phase (matter)
Pseudoelasticity
lcsh:TA401-492
General Materials Science
lcsh:Materials of engineering and construction. Mechanics of materials
Elastic modulus
Subjects
Details
- Language :
- English
- ISSN :
- 02641275
- Volume :
- 87
- Database :
- OpenAIRE
- Journal :
- Materials & Design
- Accession number :
- edsair.doi.dedup.....2d3e0eea77acd5c3dc5cfaf1d25c96b5