Scalable laser powder bed fusion processing of nitinol shape memory alloy
| Autor: | Tim Montalbano, A.M. Lennon, Morgana M. Trexler, Christopher Peitsch, Joseph Sopcisak, Ian McCue, Steven Storck |
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| Rok vydání: | 2019 |
| Předmět: |
Fabrication
Materials science Delamination Intermetallic 02 engineering and technology Shape-memory alloy 010402 general chemistry 021001 nanoscience & nanotechnology Laser 01 natural sciences 0104 chemical sciences law.invention Brittleness law Nickel titanium Heat transfer General Materials Science Composite material 0210 nano-technology |
| Zdroj: | MRS Communications. 9:1214-1220 |
| ISSN: | 2159-6867 2159-6859 |
| Popis: | The authors report on pulsed laser powder bed fusion fabrication of nitinol (NiTi) shape memory materials. The authors first performed single-track laser parameter sweeps to assess melt pool stability and determine energy parameters and hatch spacing for larger builds. The authors then assessed the melt pool chemistry as a function of laser energy density and build plate composition. Brittle intermetallics were found to form at the part/build plate interface for both N200 and Ti-6-4 substrates. The intermetallic formation was reduced by building on a 50Ni–50Ti substrate, but delamination still occurred due to thermal stresses upon cooling. The authors were able to overcome delamination on all substrates and fabricate macroscopic parts by building a lattice support structure, which is both compliant and controls heat transfer into the build plate. This approach will enable scalable fabrication of complex NiTi parts. |
| Databáze: | OpenAIRE |
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