Journal article
Fabrication of porous NiTi shape memory alloy structures using laser engineered net shaping
Journal of biomedical materials research. Part B, Applied biomaterials, Vol.89(2), pp.481-490
05/2009
Handle:
https://hdl.handle.net/2376/108699
PMID: 18937263
Abstract
Porous NiTi alloy samples were fabricated with 12-36% porosity from equiatomic NiTi alloy powder using laser engineered net shaping (LENS). The effects of processing parameters on density and properties of laser-processed NiTi alloy samples were investigated. It was found that the density increased rapidly with increasing the specific energy input up to 50 J/mm(3). Further increase in the energy input had small effect on density. High cooling rates associated with LENS processing resulted in higher amount of cubic B2 phase, and increased the reverse transformation temperatures of porous NiTi samples due to thermally induced stresses and defects. Transformation temperatures were found to be independent of pore volume, though higher pore volume in the samples decreased the maximum recoverable strain from 6% to 4%. Porous NiTi alloy samples with 12-36% porosity exhibited low Young's modulus between 2 and 18 GPa as well as high compressive strength and recoverable strain. Because of high open pore volume between 36% and 62% of total volume fraction porosity, these porous NiTi alloy samples can potentially accelerate the healing process and improve biological fixation when implanted in vivo. Thus porous NiTi is a promising biomaterial for hard tissue replacements.
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Details
- Title
- Fabrication of porous NiTi shape memory alloy structures using laser engineered net shaping
- Creators
- B Vamsi Krishna - W. M. Keck Biomedical Materials Research Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920, USASusmita BoseAmit Bandyopadhyay
- Publication Details
- Journal of biomedical materials research. Part B, Applied biomaterials, Vol.89(2), pp.481-490
- Academic Unit
- Mechanical and Materials Engineering, School of
- Publisher
- United States
- Identifiers
- 99900547213201842
- Language
- English
- Resource Type
- Journal article