Solid state synthesis of nanocrystalline and/or amorphous 50Ni–50Ti alloy

Gu, Yang; Goh, C. W.; Goi, L. S.; Lim, Chu Sing; Jarfors, Anders E. W.; Tay, B.Y.; Yong, M. S.

doi:10.1016/j.msea.2004.09.025

Cited by 49 publications

(20 citation statements)

References 23 publications

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“…The porous NiTi synthesized by elemental powders has an average width of channels ranging from 1 to 3.5 mm with a general porosity of 45 vol %. 16 The differences in the pore shape of the porous NiTi synthesized by the powders with and without the addition of nanocrystalline Ni-Ti could be due to the differences in the particle size and the energy stored in the powder. The mechanically alloyed nanocrystalline Ni-Ti has much smaller particle size compared to the elemental powders, and greater energy stored in the powders through atomic arrangement in the cores of defect such as grain boundaries, interphase boundaries, or dislocations resulted from the mechanical alloying process.…”

Section: Resultsmentioning

confidence: 99%

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In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

Tay

et al. 2006

J Biomedical Materials Res

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Porous NiTi with an average porosity of 55 vol % and a general pore size of 100-600 microm was synthesized by self-propagating high temperature synthesis (SHS) with the addition of mechanically alloyed nanocrystalline Ni-Ti as the reaction agent. The SHS of porous NiTi using elemental powders was also performed for comparison. To enhance the bioactivity of the metal surface, porous NiTi synthesized by nanocrystalline Ni-Ti was subjected to chemical treatment to form a layer of TiO(2) coating. The porous NiTi with TiO(2) coating was subsequently immersed in a simulated body fluid (SBF) to investigate its apatite forming ability. The effects of the addition of nanocrystalline Ni-Ti as reaction agent and the application of apatite coating on osteoblastic behavior were studied in primary cultures of human osteoblast cells. Results showed that the main phases in porous NiTi synthesized by elemental powders were NiTi, Ti(2)Ni, and unreacted free Ni. By using nanocrystalline Ni-Ti as reaction agent, the secondary intermetallic phase of Ti(2)Ni was significantly reduced and the free Ni was eliminated. TiO(2) coating with anatase phase was formed on the surface of porous NiTi after the chemical treatment. A layer consisting of nanocrystalline carbonate-containing apatite was formed on the surface of TiO(2) coating after soaking in SBF. The preliminary cell culture studies showed that the porous NiTi synthesized with the addition of nanocrystalline Ni-Ti attracted marked attachment and proliferation of the osteoblast cells. This gives the evidence of the potential biomedical applications of the porous NiTi.

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Section: Resultsmentioning

confidence: 99%

“…The details for the preparation of nanocrystalline Ni-Ti can be found in our previous study. 16 The powders were compacted into pellets with a diameter of 12.1 mm and the height of 20 mm by uniaxial die on WASBASH TM hydraulic press. The composition of the powders was 25 wt % nanocrystalline Ni-Ti ϩ 75 wt % elemental Ni-Ti.…”

Section: Methodsmentioning

confidence: 99%

In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

Tay

et al. 2006

J Biomedical Materials Res

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“…The average crystallite size and lattice strain of the MA powder is 10 nm and 0.85%, respectively. This is established by using the X-ray peak broadening techniques [16]. Fig.…”

Section: The Green Porosity Of the Pelletsmentioning

confidence: 99%

Influence of nanocrystalline Ni–Ti reaction agent on self-propagating high-temperature synthesized porous NiTi

Goh

Lim

et al. 2007

Intermetallics

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“…This indicates that lattice parameter of Ni increases with milling times due to diffusion of larger atoms of Ti into the Ni lattice resulting in an Ni(Ti) solid solution. According to the fact that the Ni lattice parameter increases by 0.1% per at.% of dissolved Ti [15], the dissolution of Ti in Ni at different milling times was calculated. Figure 4 shows the lattice parameter of Ni and the atomic percentage of dissolved Ti in Ni lattice versus milling time.…”

Section: Mechanical Activationmentioning

confidence: 99%

Fabrication of Single-Phase NiTi by Combustion Synthesis of Mechanically Activated Powders

Nasab

Aboutalebi

Seyedein

et al. 2012

Journal of Metallurgy

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Single-phase NiTi was fabricated through the thermal explosion mode of combustion synthesis of mechanically activated powders. Combustion and ignition temperatures of combustion synthesis were investigated in different milling times. In this process, equiatomic powder mixtures of nickel and titanium were activated by planetary ball mill and pressed into disk-shaped pellets then heated in a tube furnace, while temperature-time profile was recorded. X-ray diffraction analysis (XRD) was performed on milled powders as well as synthesized samples. Scanning electron microscopy (SEM) was also used to study the microstructural evolution during milling. The results showed that there was a threshold milling time to obtain single-phase NiTi. It was also seen that the ignition temperature and combustion temperature were reduced significantly by increasing milling time.

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Solid state synthesis of nanocrystalline and/or amorphous 50Ni–50Ti alloy

Cited by 49 publications

References 23 publications

In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

In vitro bioactivity and osteoblast response of porous NiTi synthesized by SHS using nanocrystalline Ni‐Ti reaction agent

Influence of nanocrystalline Ni–Ti reaction agent on self-propagating high-temperature synthesized porous NiTi

Fabrication of Single-Phase NiTi by Combustion Synthesis of Mechanically Activated Powders

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