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Searching New Solutions for NiTi Sensors through Indirect Additive Manufacturing.

Pedro Carreira¹, Daniel Gatões², Nuno Alves¹

¹CDRSP-Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, 2411-901 Leiria, Portugal.

Materials (Basel, Switzerland)

|July 27, 2022

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This summary is machine-generated.

This study explores material extrusion additive manufacturing for Nickel-Titanium Shape Memory Alloys (SMAs). Adding TiH2 to NiTi powder prevents brittle phase formation, enabling defect-free 3D printed components.

Area of Science:

Materials Science
Additive Manufacturing
Metallurgy

Background:

Nickel-Titanium (NiTi) Shape Memory Alloys (SMAs) are crucial for advanced applications like self-healing sensors in aeronautics.
Current NiTi SMA availability is limited to wires, sheets, and coatings due to processing challenges.
Additive manufacturing offers a promising route for fabricating complex NiTi structures.

Purpose of the Study:

To evaluate the potential of material extrusion (MEX) for NiTi SMA additive manufacturing.
To optimize MEX processing parameters to prevent the formation of brittle secondary phases like Ni3Ti.
To investigate the effect of TiH2 addition on NiTi powder during MEX processing.

Main Methods:

Material extrusion (MEX) of NiTi powder-based filaments.

Keywords:

Metal Extrusion (MEX)Nickel-Titanium (NiTi)Shape Memory Alloys (SMAs)Titanium Hydride (TiH2)additive manufacturing (AM)

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Debinding and sintering of extruded green strands.

Microtomography for defect analysis.

Microstructural characterization.

Mechanical property testing.

Main Results:

Prealloyed NiTi powder contains NiTi2 and Ni secondary phases, enabling liquid phase sintering (LPS).
The reaction between the liquid phase and Ni can form brittle intermetallic compounds.
Addition of 5 wt.% TiH2 to NiTi powder prevented Ni3Ti formation and resulted in a homogeneous matrix with dispersed NiTi2.
Microtomography, microstructure, and mechanical tests confirmed the viability of the optimized process.

Conclusions:

Material extrusion is a viable additive manufacturing method for NiTi SMAs.
Controlled addition of TiH2 is effective in preventing brittle phase formation during NiTi MEX.
Optimized NiTi MEX processing yields homogeneous microstructures with desirable mechanical properties for advanced applications.