Biomedical nanocrystalline metals and alloys: structure, properties and applications

The correlation between the grain size of electrodeposited coatings and the current densities was modeled by considering galvanostatic conditions. In order to test the model by experimental results, nanocrystalline (NC) nickel samples were deposited at different current densities using a Watts bath. The grain size of the deposits was evaluated by X-ray diffraction (XRD) technique. Model predictions were validated by finding a curve being the best-fit to the experimental results which were gathered from literature for different NC coatings in addition to those data measured in this research for NC nickel coatings. According to our model, the variation of grain size with the reciprocal of the current density follows a power law. A good agreement between the experimental results and model predictions was observed which indicated that the derived analytical model is applicable for producting the nanocrystalline electrodeposits with the desired grain size by controling current density.

Nanocrystalline material

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Nanocrystalline cobalt–iron alloy: Synthesis and characterization

Materials Science and Engineering A (2012)

N. M. Nik Rozlin Akram Alfantazi

Nanocrystalline material

10.1016/j.msea.2012.04.092

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A comparative study on the tribological behavior of nanocrystalline nickel and cobalt coatings correlated with grain size and phase structure

Materials Chemistry and Physics (2006)

Liping Wang Yan Gao Tao Xu Qunji Xue

Nanocrystalline material

10.1016/j.matchemphys.2005.10.014

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Relationships governing the grain size of nanocrystalline metals and alloys

Nanostructured Materials (1995)

J. Eckert

Nanocrystalline material

Attrition

Severe Plastic Deformation

Grain boundary strengthening

10.1016/0965-9773(95)00084-4

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Influences of Different Factors on the Grain Size of the Nanocrystalline Y_2O_3 in Combustion Synthesis

Lun Zhang Huang Li-lei

In this paper,different grain size of nanocrystalline Y_2O_3(Y_2O_3:Eu~(3+)) had been prepared by glycine-nitrate solution combustion synthesis and the homogeneous precipitation technique.Influences of different factors,such as quantity of glycine,water of the precursor and temperature of the muffle,on the grain size of the nanocrystalline had been researched.Experimental results show that the correction height and the correction area of the absorption peak of the Y(Eu)-O bond at 563cm~(-1) increase with the increasing grain size of the nanocrystalline but decrease with increasing size when the grain size exceeds 100nm.It can be attributed to that the number of Y(Eu)-O bonds in vibrating-running states decrease as the surface defects increase and the hanging bonds occur when the grain size is within nano-scale.

Nanocrystalline material

Muffle furnace

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Influence of Additive on Micro-structure and Nano-indentation Properties of Nanocrystalline Cu Films

Electroplating & Pollution Control (2013)

Xuesong Li

The nanocrystalline Cu films of different grain sizes were prepared by brush plating.Transmission electron microscopy(TEM) was used to analyze the micro-structure of the nanocrystalline Cu films and calculate their grain size range.Room-temperature nano-indentation experiment was performed on the nanocrystalline Cu films by universal nano/micro material tester UNMT-1.The results show that additive has a great influence on the grain size and indentation hardness of the nanocrystalline Cu films.When the content of the additive is 45 g/L,the minimum average grain size of the films is about 32 nm and the indentation hardness 3.26 GPa,but when the content of the additive is 1 g/L,the grain size increases to around 150 nm and the indentation hardness decreases to 1.72 GPa.

Nanocrystalline material

Indentation

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