Nano-hardness, wear resistance and pseudoelasticity of hafnium implanted NiTi shape memory alloy

Zhao, Tingting; Li, Yan; Liu, Yong; Zhao, Xinqing

doi:10.1016/j.jmbbm.2012.04.004

Cited by 54 publications

(15 citation statements)

References 37 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect should be attributed to the change of bulk material properties rather than the modification of thin surface layer, as the penetration depth is generally much greater than the modified layer thickness. However, one can notice some effects of the layer modification that are consistent with the observation presented in other works [22,23].…”

Section: Resultssupporting

confidence: 91%

Local Pseudoelastic Behaviour and Surface Characteristics of N Ion Implanted NiTi Shape Memory Alloy

et al. 2017

View full text Add to dashboard Cite

The main goal of the proposed paper is to present the results of the nitrogen ion implantation effects on mechanical and corrosion properties of NiTi shape memory alloy. Local pseudoelasticity phenomena of NiTi were determined using the ultra-low load applied system. The load-penetration depth curves show that lower nitrogen fluence improves mechanical properties in the near surface layer but higher ion fluence leads to degradation of pseudoelasticity properties. Corrosion resistance of NiTi in the Ringer solution was evaluated by means of electrochemical methods. The results of potentiodynamic measurements in the anodic range for implanted NiTi indicate a decrease of passive current density range in comparison with non-treated NiTi, without any signs related to Ni release. The results of impedance measurements recorded at the corrosion potential show a capacitive behaviour for all samples without clear predominance of one of them. It can be explained by the fact that this result concerns the first stage of corrosion exposition. It is shown that nitrogen ion implantation leads to formation of modified surface of improved physicochemical properties.

show abstract

Section: Resultssupporting

confidence: 91%

Local Pseudoelastic Behaviour and Surface Characteristics of N Ion Implanted NiTi Shape Memory Alloy

et al. 2017

View full text Add to dashboard Cite

show abstract

“…17 The NiTi shape memory alloy modified by hafnium implantation results in better wear resistance and exhibiting lowest hardness. 18 HfO 2 coupled with silicon nanowires is used for sensitive detection of small nucleic acid oligomers and is used to enable double-and single-stranded DNA transport through nanopores fabricated in ultrathin (2-7 nm thick) freestanding HfO 2 membranes. 19 …”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of hafnium oxide nanoparticles for bio-safety

Jayaraman¹,

Ganesan²,

Chinnathambi³

et al. 2014

mat express

View full text Add to dashboard Cite

In recent years, the perspective of applying hafnium oxide (HfO 2 ) has geared up in various field of medical science such as neutron detection, bioimplants, biosensors, radiotherapy etc., The present study is to synthesis HfO 2 nanoparticles, and check its cell viability for in vivo applications. Hafnium oxide nanoparticles of different sizes (8.79, 7.16, 6.78 nm) were synthesized by varying the intervals of stirring time (6 h, 8 h, 12 h) by precipitation method. XRD pattern and Raman spectroscopy revealed that this material crystallizes in a monoclinic structure. SEM images and TEM micrographs showed that the HfO 2 NPs were spherical in shape with an average particle size of below 10 nm. The EDAX spectrum showed that the synthesized nanoparticles were HfO 2 . 3T3 fibroblast cell lines were chosen for cytotoxic study as it mimics the human cells. The aim of this study is to compare the toxicity of different sizes of HfO 2 nanoparticles on interaction with 3T3 fibroblast cell lines. From this study we could infer that smaller sized nanoparticles (6.78 and 7.17 nm) have 86% cell viability even at the concentration of 2500 g/mL.

show abstract

“…1, it is observed that the phase transformation behavior of TiNi almost remains invariable before and after the Ti ion implantations, which indicates that the shape memory effect of the TiNi alloy may not degrade either. In our previous work, however, the phase transformation temperatures of a Ti−50.6at%Ni alloy were observed to clearly increase after Hf ion implantation [20]. Ion implantation is a severe physical process during which high-energy ions from an ion source impact the target material and part of the kinetic energy inevitably transforms into heat, leading to a temperature increase of the target.…”

Section: Surface Morphology and Chemical Compositionmentioning

confidence: 92%

“…First, the well-known Gaussian distribution of ion resource elements in the implanted region was absent in the Ti−TiNi sample because the implanted Ti ions cannot be distinguished from the intrinsic Ti ions in TiNi. Second, a Ni-rich zone with a Ni concentration higher than 50 at% usually formed below the implanted region, when NiTi were modified by N [13], Ta [15−16] or Hf [20] ion implantations. However, this zone was not formed in the Ti−TiNi sample, which may be beneficial to the suppression of Ni ion release in long-term applications.…”

Section: Surface Morphology and Chemical Compositionmentioning

confidence: 99%

“…Therefore, many investigations on surface modification of TiNi have been performed to enhance its corrosion resistance and suppress the leaching of Ni ions and thus improve the biocompatibility [7−9]. Among the surface modification methods, ion implantation has been demonstrated as an effective approach to modify TiNi using non-metals such as O, C, and N [10−13], and metals such as Ta [14−17], Nb [18], Zr [19], and Hf [20] as ion source elements. All these implanted ions can form a more condensed and inert composite surface layer such as TiN/TO 2 , TiN/TiO 2 , Ta 2 O 5 /TiO 2 , Nb 2 O 5 /TiO 2 , or ZrO 2 /TiO 2 on the TiNi alloy, and therefore, enhance the biocompatability and even mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface modification of Ti−49.8at%Ni alloy by Ti ion implantation: phase transformation, corrosion, and cell behavior

Zhou

Luo

et al. 2015

Int J Miner Metall Mater

Self Cite

View full text Add to dashboard Cite

The Ti−49.8at%Ni alloy was modified by Ti ion implantation to improve its corrosion resistance and biocompatibility. The chemical composition and morphologies of the TiNi alloy surface were determined using atomic force microscopy (AFM), auger electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS). The results revealed that Ti ion implantation caused the reduction of Ni concentration and the formation of a TiO 2 nano-film on the TiNi alloy. The phase transformation temperatures of the Ti-TiNi alloy remained almost invariable after Ti ion implantation. Electrochemical tests indicated that the corrosion resistance of TiNi increased after Ti ion implantation. Moreover, the Ni ion release rate in 0.9% NaCl solution for the TiNi alloy remarkably decreased due to the barrier effect of the TiO 2 nano-film. The cell proliferation behavior on Ti-implanted TiNi was better than that on the untreated TiNi after cell culture for 1 d and 3 d.

show abstract

Nano-hardness, wear resistance and pseudoelasticity of hafnium implanted NiTi shape memory alloy

Cited by 54 publications

References 37 publications

Local Pseudoelastic Behaviour and Surface Characteristics of N Ion Implanted NiTi Shape Memory Alloy

Local Pseudoelastic Behaviour and Surface Characteristics of N Ion Implanted NiTi Shape Memory Alloy

Synthesis and characterization of hafnium oxide nanoparticles for bio-safety

Surface modification of Ti−49.8at%Ni alloy by Ti ion implantation: phase transformation, corrosion, and cell behavior

Contact Info

Product

Resources

About