Next Article in Journal
Magnesium-β-Tricalcium Phosphate Composites as a Potential Orthopedic Implant: A Mechanical/Damping/Immersion Perspective
Next Article in Special Issue
An Analysis of Electroplated cBN Grinding Wheel Wear and Conditioning during Creep Feed Grinding of Aeronautical Alloys
Previous Article in Journal
Effect of Microstructures on Working Properties of Nickel-Manganese-Copper Cast Iron
Previous Article in Special Issue
High Speed Finish Turning of Inconel 718 Using PCBN Tools under Dry Conditions
Article Menu
Issue 5 (May) cover image

Export Article

Open AccessArticle
Metals 2018, 8(5), 342;

Manufacturing and Characterization of NiTi Alloy with Functional Properties by Selective Laser Melting

Institute of Mold & Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
Division of Oral and Maxillofacial Surgery, Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
Casting Section, Metal Industries Research & Development Centre, Kaohsiung 811, Taiwan
Author to whom correspondence should be addressed.
Received: 18 February 2018 / Revised: 30 April 2018 / Accepted: 8 May 2018 / Published: 11 May 2018
(This article belongs to the Special Issue Machining and Finishing of Nickel and Titanium Alloys)
PDF [2808 KB, uploaded 11 May 2018]


In this study, an optimal selective laser melting (SLM) process for manufacturing dense NiTi alloy with pseudoelasticity and shape-memory capability was proposed. The microstructure, phase-transformation temperature, shape memory capability, and pseudoelasticity were investigated by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, and bending and tensile tests. NiTi powder with a particle size > 45 μm was selected for the subsequent SLM process, because it exhibited a Ni/Ti ratio of ~1 and a lower oxygen content than powders with smaller particle sizes. A thin-walled disk (0.48 mm thick) and cuboid samples (5 mm thick) were prepared for investigating the variation in the homogeneity of the microstructure. The thin-walled SLM-NiTi sample exhibited a marginally inhomogeneous microstructure between layers, and defects existed in the previously formed side. The cuboid SLM-NiTi sample was fabricated without undesirable secondary phases, and it exhibited a 100% shape-recovery rate under 2% bending strain and completely pseudoelastic under 3% strain. Also, the SLM-NiTi exhibited lower phase-transformation temperatures and a broader phase-transformation range than the original NiTi. The phase-transformation range can be reduced by annealing. View Full-Text
Keywords: selective laser melting; NiTi; shape memory; pseudoelasticity selective laser melting; NiTi; shape memory; pseudoelasticity

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Ou, S.-F.; Peng, B.-Y.; Chen, Y.-C.; Tsai, M.-H. Manufacturing and Characterization of NiTi Alloy with Functional Properties by Selective Laser Melting. Metals 2018, 8, 342.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top