scholarly journals A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1683 ◽  
Author(s):  
Xiebin Wang ◽  
Sergey Kustov ◽  
Jan Van Humbeeck
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Functional Properties ◽  
Complex Structures ◽  
Transformation Behavior ◽  
Laser Melting ◽  
Niti Shape Memory Alloys

Due to unique functional and mechanical properties, NiTi shape memory alloys are one of the most promising metallic functional materials. However, the poor workability limits the extensive utilization of NiTi alloys as components of complex shapes. The emerging additive manufacturing techniques provide high degrees of freedom to fabricate complex structures. A freeform fabrication of complex structures by additive manufacturing combined with the unique functional properties (e.g., shape memory effect and superelasticity) provide great potential for material and structure design, and thus should lead to numerous applications. In this review, the unique microstructure that is generated by selective laser melting (SLM) is discussed first. Afterwards, the previously reported transformation behavior and mechanical properties of NiTi alloys produced under various SLM conditions are summarized.

On the Properties of Ni-Rich NiTi Shape Memory Parts Produced by Selective Laser Melting

2012 ◽  
Author(s):  
Christoph Haberland ◽  
Horst Meier ◽  
Jan Frenzel
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Functional Properties ◽  
Processing Route ◽  
Laser Melting ◽  
Elementary Processes ◽  
Near Net Shape ◽  
Manufacturing Technologies ◽  
Niti Shape Memory Alloys

Processing of Nickel-Titanium (NiTi) shape memory alloys (SMAs) is challenging because smallest compositional variances and all types of microstructural features strongly affect the elementary processes of the martensitic transformation and thus the functional properties of the material. Against this background, powder metallurgical near net shape methods are attractive for the production of NiTi components. Especially additive manufacturing technologies (AM) seem to provide high potential, although they have received only little attention for processing NiTi so far. This work is the first to report on pseudoelastic properties of additive manufactured Ni-rich NiTi. We show how to establish pseudoelasticity in NiTi samples prepared by the additive manufacturing technique Selective Laser Melting (SLM). Therefore, we analyze phase transformation behavior, mechanical characteristics and functional properties of our materials subjected to different heat treatments. The obtained results are compared to the behavior of conventional NiTi. The presented results clearly indicate that SLM provides a promising processing route for the fabrication of high quality NiTi parts.

Selective laser melting produced layer-structured NiTi shape memory alloys with high damping properties and Elinvar effect

2018 ◽  
Vol 146 ◽  
pp. 246-250 ◽  
Author(s):  
Xiebin Wang ◽  
Mathew Speirs ◽  
Sergey Kustov ◽  
Bey Vrancken ◽  
Xiaopeng Li ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Damping Properties ◽  
Laser Melting ◽  
Niti Shape Memory Alloys

Shape memory response of porous NiTi shape memory alloys fabricated by selective laser melting

2018 ◽  
Vol 29 (4) ◽  
Author(s):  
Soheil Saedi ◽  
Sayed E. Saghaian ◽  
Ahmadreza Jahadakbar ◽  
Narges Shayesteh Moghaddam ◽  
Mohsen Taheri Andani ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Laser Melting ◽  
Memory Response ◽  
Porous Niti ◽  
Niti Shape Memory Alloys

scholarly journals Directionally-Dependent Mechanical Properties of Ti6Al4V Manufactured by Electron Beam Melting (EBM) and Selective Laser Melting (SLM)

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3603
Author(s):  
Tim Pasang ◽  
Benny Tavlovich ◽  
Omry Yannay ◽  
Ben Jakson ◽  
Mike Fry ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Tensile Strength ◽  
Electron Beam ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Electron Beam Melting ◽  
Rolling Direction ◽  
Laser Melting ◽  
Plate Rolling

An investigation of mechanical properties of Ti6Al4V produced by additive manufacturing (AM) in the as-printed condition have been conducted and compared with wrought alloys. The AM samples were built by Selective Laser Melting (SLM) and Electron Beam Melting (EBM) in 0°, 45° and 90°—relative to horizontal direction. Similarly, the wrought samples were also cut and tested in the same directions relative to the plate rolling direction. The microstructures of the samples were significantly different on all samples. α′ martensite was observed on the SLM, acicular α on EBM and combination of both on the wrought alloy. EBM samples had higher surface roughness (Ra) compared with both SLM and wrought alloy. SLM samples were comparatively harder than wrought alloy and EBM. Tensile strength of the wrought alloy was higher in all directions except for 45°, where SLM samples showed higher strength than both EBM and wrought alloy on that direction. The ductility of the wrought alloy was consistently higher than both SLM and EBM indicated by clear necking feature on the wrought alloy samples. Dimples were observed on all fracture surfaces.

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