Effect of Shot Number on Crater Formation of Magnesium Alloy Modified with High-Intensity Pulsed Ion Beam

2012 ◽  
Vol 627 ◽  
pp. 629-632
Author(s):  
Peng Li
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Ion Beam ◽  
Surface Profile ◽  
Crater Formation ◽  
Shot Number ◽  
The Mean ◽  
Surface Morphologies ◽  
Ion Current Density ◽  
Surface Increase

Abstract. HIPIB irradiation of magnesium alloy is carried out at a specific ion current density of 100 A/cm2 with shot number from one to ten in order to explore the effect of shot number on crater formation of magnesium alloy. Surface morphologies, surface roughness and mean spacing of surface profile irregularities of the irradiated samples are examined by scanning electron microscopy (SEM) and profilometer technique, respectively. It is found that the surface roughness, the mean spacing of surface profile irregularities, and the maximum crater diameter on the irradiated surface increase with increasing shot number, whereas the crater density decreases as the shot number increases.

Influence of Ion Current Density on the Surface Morphology of AZ31 Magnesium Alloy Irradiated by High-Intensity Pulsed Ion Beam

2011 ◽  
Vol 391-392 ◽  
pp. 868-871
Author(s):  
Peng Li ◽  
Y.X. Wang ◽  
L. Xue
Keyword(s):  
Magnesium Alloy ◽  
Current Density ◽  
Ion Beam ◽  
Surface Profile ◽  
Ion Current ◽  
Az31 Magnesium Alloy ◽  
Horizontal Wave ◽  
Surface Profiles ◽  
Surface Morphologies ◽  
Ion Current Density

HIPIB irradiation into AZ31 magnesium alloy is performed at ion current density of 100-300 A/cm2 with 1 shot. The surface morphologies and surface profiles of the irradiated AZ31 magnesium alloy samples are characterized by scanning electron microscopy (SEM) and profilometer, respectively. It is found that HIPIB irradiation leads to the formation of crater in local region of irradiated samples, and crater density increases with increasing ion current density. Both the surface roughness that reflects the vertical wave of surface profile and the mean spacing of surface profile irregularities that reflects the horizontal wave of surface profile increase as ion current density increases. These results are in agreement with the SEM observation on the irradiated surface.

Improved Wear Resistance of Magnesium Alloy Irradiated by High-Intensity Pulsed Ion Beam at Lower Energy Density

2011 ◽  
Vol 314-316 ◽  
pp. 219-222
Author(s):  
Peng Li ◽  
Tian Xiang Peng
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Energy Density ◽  
Lower Energy ◽  
Wear Behavior ◽  
Ion Beam ◽  
Surface Hardness ◽  
Dry Sliding Wear ◽  
Shot Number ◽  
Lower Energy Density

HIPIB irradiation experiment is carried out at lower energy density of 0.55 J/cm2 with shot number from 1 to 10, and dry sliding wear behavior is investigated in order to explore the low energy-modification of magnesium alloy by HIPIB. It is found that HIPIB irradiation leads to the increase in surface hardness and therefore the improvement in wear resistance compared with the original sample. The improved wear resistance is mainly ascribed to the enhanced surface hardness induced by HIPIB irradiation.

Effect of High-Intensity Pulsed Ion Beam Irradiation on the Electrochemical Corrosion Behavior of AZ31 Magnesium Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 571-574
Author(s):  
Peng Li
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Current Density ◽  
Ion Beam ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Open Circuit ◽  
Electrochemical Corrosion Behavior ◽  
Shot Number

HIPIB irradiation experiment is carried out at a specific ion current density of 1.1 J/cm2 with shot number from one to ten in order to explore the effect of shot number on electrochemical corrosion behavior of magnesium alloy. Surface morphologies, microstructure and corrosion resistance of the irradiated samples are examined by scanning electron microscopy (SEM), transmission electron microscope (TEM) and potentiodynamic polarization technique, respectively. It is found that HIPIB irradiation leads to the increase in open circuit potential, corrosion potential and breakdown potential, and the decrease in the corrosion current density and the corrosion rate as compared to the original sample. The improved corrosion resistance is mainly attributed to the grain refinement and surface purification induced by HIPIB irradiation.

Paper 6: Assessment of Face Seal Performance Based on the Parameters of a Statistical Representation of Surface Roughness

1967 ◽  
Vol 182 (11) ◽  
pp. 101-107 ◽  
Author(s):  
L. A. Mitchell ◽  
M. D. Rowe
Keyword(s):  
Surface Roughness ◽  
Standard Deviation ◽  
Surface Profile ◽  
Real Surface ◽  
Face Seal ◽  
Statistical Representation ◽  
Adequate Information ◽  
Centre Line ◽  
Sealing Performance ◽  
The Mean

Most methods commonly used to describe real surface roughness do not provide adequate information to enable predictions to be made of fluid leakage between two surfaces. To carry out such an analysis it is essential to know the depths of the remaining valleys at all stages of compression. It is shown that, when the distributions of peak and valley levels are defined, load-compression and load-leakage relationships can be derived if wedge-shaped asperities of constant apex semi-angle are assumed. The results suggest that a convenient quantity for specifying the form of a surface profile is the ratio of the distance between the mean peak and mean valley levels to the standard deviation of the distributions ( d/σ). For the best sealing performance d/σ should be as large as possible, whilst the centre-line average (c.l.a.), which provides a measure of the scale of the roughness, should be as small as possible.

scholarly journals Assessing the Functional Properties of TiZr Nanotubular Structures for Biomedical Applications, through Nano-Scratch Tests and Adhesion Force Maps

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 900
Author(s):  
Maria Vardaki ◽  
Aida Pantazi ◽  
Ioana Demetrescu ◽  
Marius Enachescu
Keyword(s):  
Surface Roughness ◽  
Functional Properties ◽  
Bacterial Adhesion ◽  
Biomedical Applications ◽  
Adhesion Force ◽  
Roughness Parameters ◽  
Force Microscopy ◽  
Atomic Force ◽  
The Mean ◽  
Scratch Tests

In this work we present the results of a functional properties assessment via Atomic Force Microscopy (AFM)-based surface morphology, surface roughness, nano-scratch tests and adhesion force maps of TiZr-based nanotubular structures. The nanostructures have been electrochemically prepared in a glycerin + 15 vol.% H2O + 0.2 M NH4F electrolyte. The AFM topography images confirmed the successful preparation of the nanotubular coatings. The Root Mean Square (RMS) and average (Ra) roughness parameters increased after anodizing, while the mean adhesion force value decreased. The prepared nanocoatings exhibited a smaller mean scratch hardness value compared to the un-coated TiZr. However, the mean hardness (H) values of the coatings highlight their potential in having reliable mechanical resistances, which along with the significant increase of the surface roughness parameters, which could help in improving the osseointegration, and also with the important decrease of the mean adhesion force, which could lead to a reduction in bacterial adhesion, are providing the nanostructures with a great potential to be used as a better alternative for Ti implants in dentistry.

Hydrogen Ion Beam Processing of Single Crystal Diamond Chips

1994 ◽  
Vol 354 ◽  
Author(s):  
Shuji Kiyohara ◽  
Iwao Miyamoto
Keyword(s):  
Surface Roughness ◽  
Single Crystal ◽  
Incidence Angle ◽  
Ion Beam ◽  
Etching Rate ◽  
Hydrogen Ion ◽  
Hydrogen Ions ◽  
Ion Beam Etching ◽  
Single Crystal Diamond ◽  
Before And After

AbstractIn order to apply ion beam etching with hydrogen ions to the ultra-precision processing of diamond tools, hydrogen ion beam etching characteristics of single crystal diamond chips with (100) face were investigated. The etching rate of diamond for 500 eV and 1000 eV hydrogen ions increases with the increase of the ion incidence angle, and eventually reaches a maximum at the ion incidence angle of approximately 50°, then may decrease with the increase of the ion incidence angle. The dependence of the etching rate on the ion incidence angle of hydrogen ions is fairly similar to that obtained with argon ions. Furthermore, the surface roughness of diamond chips before and after hydrogen ion beam etching was evaluated using an atomic force microscope. Consequently, the surface roughness after hydrogen ion beam etching decreases with the increase of the ion incidence angle within range of the ion incidence angle of 60°.

Enhancement of reflection and backscattering components by plane wave imaging for estimation of surface roughness

2021 ◽  
Author(s):  
Kazuhiro Tochigi ◽  
Ryo Nagaoka ◽  
Jens Erik Wilhjelm ◽  
Hideyuki Hasegawa
Keyword(s):  
Surface Roughness ◽  
Plane Wave ◽  
Arterial Wall ◽  
Early Stage ◽  
Mean Value ◽  
Luminal Surface ◽  
Ultrasonic Echo ◽  
Wave Imaging ◽  
The Mean ◽  
Reflection Component

Abstract In the early stage of atherosclerosis, the luminal surface of the arterial wall becomes rough. Methods for distinguishing between the reflected and backscattered components in the ultrasonic echo from the arterial wall has the potential to be used as a method for assessment of the roughness of the arterial wall. In this study, we proposed a method to distinguish between the reflected and backscattered components using a technique based on plane wave compounding. This method was evaluated by experiments using planar phantoms with rough surfaces made of polyurethane rubber. The coefficient of variation calculated from the mean value of the reflection component and the standard deviation of the backscattering component was proportional to the roughness of the rubber phantom. This result shows the potential usefulness of this method for analyzing surface roughness of the arterial wall.

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