Paper Titles
Tensile Strength on Seven Type of Fruits Skin Fiber Thermoplastic Poyurethane (TPU)
p.608
Effect of Sr on the Bioactivity of Sol-Gel Derived New Silicate Bioglass S55P4
p.613
Mechanical Properties of Bioactive Glass Fabricated Using Natural Resources Materials
p.620
Synthesis and Characterization of 50S8P Bioglass through Sol Gel Method
p.626
Characterization of NiTi Shape Memory Alloy Sintered at Different Temperatures in Reducing Environment
p.632
Chitosan/Polyethylene Oxide (PEO) Filled Carbonized Wood Fiber Conductive Composite Film
p.638
Efficiency of Impressed Current Cathodic Protection in Repaired Reinforced Concrete
p.647
Effects of Metakoalin on Municipal Solid Waste Incineration (MSWI) Bottom Ash-Cement Composite
p.653
Effect of Adding Sago and Sintering to the Properties of Geopolymer Mortar
p.659

Characterization of NiTi Shape Memory Alloy Sintered at Different Temperatures in Reducing Environment

Article Preview

Abstract:

NiTi has received significant interest as medical implant materials due to its shape memory effect behavior apart from its good biocompatibility and mechanical properties. The formidable challenge of obtaining single phase NiTi from elemental powders via solid state is due to oxidation problem of elemental powders and the oxygen atoms dissolve in NiTi matrix as interstitial impurities forming stable oxygen-rich TiNiOx. This may deterioriate the shape memory behavior of NiTi. This research investigates the use of MgH2 in combination with CaH2 as in-situ reducing agent to eliminate oxidation of the specimen during sintering both at lower and higher sintering temperatures. Here, the effect of sintering temperature on phase formation and transformation behavior of NiTi in reducing environment was studied. The phase formation was characterized by using x-ray diffraction (XRD) where the morphology and elemental analysis were characterized by using the scanning electron microscope (SEM) equipped with EDS. The martensitic transformation behavior was analyzed using differential scanning calorimeter (DSC). The use of MgH2 and CaH2 as reducing agent has a significant influence on the phase formation of NiTi synthesized via solid state especially at 930 °C, where almost single phase NiTi was formed with good transformation behavior. This reducing agent creates a conducive environment for the production of single phase NiTi.

You might also be interested in these eBooks
Development and Investigation of Materials Using Modern Techniques II View Preview

Info:

Periodical:

Materials Science Forum (Volume 1010)

Pages:

632-637

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1010.632

Citation:

Cite this paper

Online since:

September 2020

Authors:

Hafizah Hanim Mohd Zaki*, Nur Azemuzahir Mohd Sobri, Jamaluddin Abdullah, Norshahida Sariffudin, Farah Diana Mohd Daud

Keywords:

Porous NiTi, Reducing Environment, Shape Memory Alloy, Sintering, Transformation Behavior

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2020 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

* - Corresponding Author

References

[1] S. M. Toker and D. Canadinc, Evaluation of the biocompatibility of NiTi dental wires: A comparison of laboratory experiments and clinical conditions, Materials Science and Engineering: C. 40, 142-147, (2014).

DOI: 10.1016/j.msec.2014.03.060

Google Scholar

[2] M. H. M. S. Hafizah Hanim Mohd Zaki, Jamaluddin Abdullah, Norshahida Sarifuddin, Comparison studies on phase formation and transformation behavior between Ni-Ti and Ni-TiH2 synthesized via solid state sintering., International Journal of Current Science, Engineering & Technology. 1, 464-470, (2018).

DOI: 10.30967/ijcrset.1.s1.2018.464-470

Google Scholar

[3] B. Yuan, C. Y. Chung, and M. Zhu, Microstructure and martensitic transformation behavior of porous NiTi shape memory alloy prepared by hot isostatic pressing processing, Materials Science and Engineering: A. 382, 181-187, (2004).

DOI: 10.1016/j.msea.2004.04.068

Google Scholar

[4] S. Wisutmethangoon, N. Denmud, and L. Sikong, Characteristics and compressive properties of porous NiTi alloy synthesized by SHS technique, Materials Science and Engineering: A. 515, 93-97, (2009).

DOI: 10.1016/j.msea.2009.02.055

Google Scholar

[5] B. Liu, S. Huang, L. Chen, J. Van Humbeeck, and J. Vleugels, Rapid synthesis of dense NiTi alloy through spark plasma sintering of a TiH2/Ni powder mixture, Materials Letters, 191, 89-92, (2017).

DOI: 10.1016/j.matlet.2017.01.060

Google Scholar

[6] J. L. Xu, L. Z. Bao, A. H. Liu, X. J. Jin, Y. X. Tong, J. M. Luo, et al., Microstructure, mechanical properties and superelasticity of biomedical porous NiTi alloy prepared by microwave sintering, Materials Science and Engineering: C. 46, 387-393, (2015).

DOI: 10.1016/j.msec.2014.10.053

Google Scholar

[7] J. Laeng, Z. Xiu, X. Xu, X. Sun, H. Ru, and Y. Liu, Phase formation of Ni–Ti via solid state reaction, Physica Scripta. T129, 250-254, (2007).

DOI: 10.1088/0031-8949/2007/t129/056

Google Scholar

[8] H. H. Mohd Zaki and J. Abdullah, The role of CaH2 in preventing oxidation for the production of single-phase NiTi alloy in solid state, Journal of Alloys and Compounds. 655, 364-371, (2016).

DOI: 10.1016/j.jallcom.2015.09.164

Google Scholar