scholarly journals Improving the Accuracy of Low-load Vickers Microhardness Testing of Hard Thin Films

2014 ◽  
Vol 12 ◽  
pp. 289-294 ◽  
Author(s):  
Gabriela Strnad ◽  
Laszlo Jakab-Farkas
Keyword(s):  
Thin Films ◽  
Vickers Microhardness ◽  
Low Load ◽  
Microhardness Testing ◽  
Vickers Microhardness Testing

scholarly journals Microhardness Characteristics of Al-6063 Alloy Processed by Equal Channel Angular Extrusion

2014 ◽  
Vol 564 ◽  
pp. 513-518 ◽  
Author(s):  
J. Nemati ◽  
Shamsuddin Sulaiman ◽  
B.T. Hang Tuah Baharudin ◽  
M.A. Azmah Hanim ◽  
G.H. Majzoobi
Keyword(s):  
Detailed Analysis ◽  
Vickers Microhardness ◽  
Equal Channel Angular Extrusion ◽  
Inner Surface ◽  
Microhardness Testing ◽  
Angular Extrusion ◽  
Ram Speed ◽  
Vickers Microhardness Testing ◽  
Grain Diameter

In this study, annealed AL-6063 alloy was processed by the Equal Channel Angular Extrusion (ECAE) up to 6 passes at a temperature of 200°c following route A with a constant ram speed of 30 mm/min through a die angle of 90° between the die channels. The influence of ECAE processing on the evolution of microhardness in the material was studied using Vickers microhardness testing. The detailed analysis was carried out on the samples of as-received, one, two, three, four, five, and six pass conditions. The grain diameter reduced from 45μm to 2.8 μm after 6 passes of ECAE. The results indicated around 90% increase in Microhardness after 5 passes. Hardness of the inner surface where the billet was under compression was slightly higher than that of the mid-surface.

Percolation Effects in the Mechanical Properties of Granular Ni-A12O3 thin films

1990 ◽  
Vol 195 ◽  
Author(s):  
T.E. Schlesinger ◽  
A. Gavrin ◽  
R.C. Cammarata ◽  
C.-L. Chien
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Magnetic Properties ◽  
Percolation Threshold ◽  
Volume Fraction ◽  
Electrical And Magnetic Properties ◽  
Low Load

ABSTRACTThe mechanical properties of sputtered Ni-Al2O3 granular thin films were investigated by low load microharaness testing. It was found that the microhardness of these films displayed a percolation threshold at a nickel volume fraction of about 0.6, below which the hardness is greatly enhanced. This behavior is qualitatively similar to the electrical and magnetic properties of these types of films. A percolation threshold in hardness can be understood as due to a change in the mechanism for plastic deformation.

scholarly journals Effect of target-substrate distance on thickness and hardness of carbon thin films on SKD11 steel using target material from battery carbon rods

2021 ◽  
Vol 1 (12 (109)) ◽  
pp. 22-28
Author(s):  
Aladin Eko Purkuncoro ◽  
Rudy Soenoko ◽  
Dionysius Joseph Djoko Herry Santjojo ◽  
Yudy Surya Irawan
Keyword(s):  
Thin Films ◽  
Vickers Microhardness ◽  
Steel Substrate ◽  
Optical Microscope ◽  
Average Thickness ◽  
Microhardness Test ◽  
Substrate Distance ◽  
Plasma Sputtering ◽  
Carbon Rods ◽  
Carbon Thin Films

Carbon thin films on SKD11 steel were deposited by 40 kHz frequency plasma sputtering technique using a waste of battery carbon rods in argon plasma, and their mechanical properties were investigated by various target-substrate distances (1 cm, 1.7 cm, 2 cm, and 2.4 cm). The power used is 340 watts, the vacuum time is 90 minutes, and the gas flow rate is 80 ml/minute. The deposition time of carbon in plasma sputtering is 120 minutes with the initial temperature (temperature during vacuum) of 28 oC and the final temperature (the temperature after plasma sputtering) is 300 oC. The hardness value of SKD11 steel deposited with carbon thin films on SKD11 with target-substrate distance was tested using the Vickers microhardness test. Testing the thickness of the carbon thin films on the SKD11 steel substrate was carried out using a Nikon type 59520 optical microscope. Qualitative analysis of the thickness of the carbon thin films on the SKD11 steel substrate at a scale of 20 μm is shown by an optical microscope. Qualitatively, the thin film at a distance of 1.7 cm looks the brightest and thickest than other distance variations. Based on the Vickers microhardness test and Nikon type 59520 optical microscope, at the distance of 1 cm to 1.7 cm, the average thickness and hardness increased from 10,724 μm (286.6 HV) to 13,332 μm (335.9 HV). Furthermore, at the variation of the distance from 1.7 cm to 2.4 cm, the average thickness and hardness continued to decrease from 13.332 μm (335.9 HV) to 7.257 μm (257.3 HV). The possibility of interrupting atoms colliding with argon atoms in inert conditions increases at a long distance, thus causing the deposition flux on the SKD11 steel substrate to decrease

Nanoparticles as void fillers in glass ionomer cement for enhanced physicomechanical properties

2020 ◽  
Vol 10 (11) ◽  
pp. 1960-1964
Author(s):  
Mansour K. A. Assery ◽  
Abdulrahman Alshubat ◽  
AlWaleed Abushanan ◽  
Nawaf Labban ◽  
Mohamed Hashem
Keyword(s):  
Vickers Microhardness ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Study Groups ◽  
Control Group ◽  
Glass Ionomer ◽  
Universal Testing ◽  
Microhardness Testing ◽  
Diametral Tensile Strength ◽  
Ionomer Cement

The study evaluated the addition of silver (Ag) and titanium dioxide (TiO2) nanoparticles to conventional glass ionomer cement (GIC), considering compressive strength (CS), diametral tensile strength (DTS), flexural strength (FS), and hardness. Ag and TiO2 nanoparticles were blended into the powder of a commercially available GIC restorative material at 5% (w/w). Unblended powder was used as a control. One hundred twenty samples were prepared from two study groups and one control group (n = 10). CS, DTS, and FS were evaluated using a universal testing machine, while hardness was measured by Vickers microhardness testing. The data obtained were analyzed using One-way analysis of variance and the Tukey?s test (p < 0.05). GIC containing Ag and TiO2 nanoparticles significantly improved the CS, DTS, and hardness compared to the control group (p < 0.05). However, the FS was not much affected by the addition of either of the nanoparticles (p >0.05). TiO2 blended GIC demonstrated significantly higher CS (154.20+2.38) and DTS (13.2±0.5 MPa) compared to control 117.2±1.2 MPa and 7.2 ±0.8 MPa, respectively. While Blend of GIC+Ag nanoparticles showed the highest FS (29.0±0.7 MPa). Additionally, the blend of GIC+TiO2 exhibited the highest hardness (90.4±1.1 VHN). Ag and TiO2 blended GICs might guarantee their use in occlusal or higher stress-bearing areas.

Analysis of the Solid Solution Microstructure of (HF) Al-Zn Alloys

2010 ◽  
Vol 303-304 ◽  
pp. 39-53 ◽  
Author(s):  
H. Bedboudi ◽  
A. Bourbia ◽  
M. Draissia ◽  
S. Boulkhessaim ◽  
M.Y. Debili
Keyword(s):  
High Frequency ◽  
Vickers Microhardness ◽  
Induction Melting ◽  
Strengthening Mechanisms ◽  
X Ray Diffraction ◽  
Microstructural Characteristics ◽  
X Ray ◽  
Microhardness Testing ◽  
Rapidly Solidified ◽  
Zn Alloys

Rapidly solidified Al-Zn alloys with Zn contents ranging up to 50 wt.% were made under vacuum, by high-frequency (HF) induction melting, from compacted mixture targets of Al and Zn of fine (99.99 % purity) elemental powders. The microstructural characteristics and strengthening mechanisms were investigated. The crystallographic microstructures were characterized by means of X-ray diffraction (XRD) analyses and optical microscopy observations as well as Vickers microhardness testing. Detailed overviews of alloying solubility of zinc in aluminium were given. Extensive solid solutions of CFC Al were found in the (HF) Al-Zn alloys, and a higher Vickers microhardnesses compared to that of pure (HF) aluminium.

Optimization of Reactive Sputtering Technology for Hard Coatings Deposition

2014 ◽  
Vol 657 ◽  
pp. 246-250 ◽  
Author(s):  
Gabriela Strnad ◽  
Laszlo Jakab-Farkas ◽  
Sandor Papp ◽  
Albert Zsombor Fekete ◽  
Dominic Biro ◽  
...  
Keyword(s):  
Thin Films ◽  
Vickers Microhardness ◽  
Dynamic Pressure ◽  
Research Work ◽  
System Optimization ◽  
Hard Coatings ◽  
Reactive Magnetron ◽  
Deposition Chamber ◽  
Tem Microscopy ◽  
Sputtering System

The paper presents the research work carried out in order to optimize the technology and reactive magnetron sputtering system used for the deposition of hard, multielemental, multiphase coatings. On the basis of a model of dynamic pressure developed and validated by us, regulatory structures for dynamic pressure inside the deposition chamber were designed and implemented. By using this optimization, extensive experiments involving nanostructured (Ti, Al, Si)N coatings, with a thickness of approx. 2 μm, were carried out. Using TEM microscopy, SAED and Vickers microhardness characterizations the results of deposition system optimization on the microstructure and microhardness of thin films were investigated.

Effects of Interlayers on the Scratch Adhesion Performance of Ultra-Thin Films of Copper and Gold on Silicon Substrates

1994 ◽  
Vol 356 ◽  
Author(s):  
S. D. McAdams ◽  
T. Y. Tsui ◽  
W. C. Oliver ◽  
G. M. Pharr
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Single Crystal Silicon ◽  
Silicon Substrates ◽  
Scratch Testing ◽  
Crystal Silicon ◽  
Testing Apparatus ◽  
Low Load ◽  
Adhesion Performance ◽  
Made In

AbstractScratch testing has long been used to assess the adhesion of a film to its substrate. As film thicknesses have decreased, the need for greater precision and sensitivity in the scratch testing apparatus has increased. To this end, a nanoindenter was modified to make finely controlled, low-load scratches. Scratches at various loads and two orientations of a Berkovich scratching diamond were made in films of 100 nm of gold and 200 nm of copper, each on single crystal silicon. For each film type, samples with no interlayer, with an SiO2 interlayer, and with a TiW on SiO2 interlayer were tested. The scratch morphology was found to vary in a regular way with load, diamond orientation and interlayer material.

The frictional component of the indentation size effect in low load microhardness testing

1993 ◽  
Vol 8 (5) ◽  
pp. 1028-1032 ◽  
Author(s):  
H. Li ◽  
A. Ghosh ◽  
Y.H. Han ◽  
R.C. Bradt
Keyword(s):  
Size Effect ◽  
Test Specimen ◽  
Indentation Size Effect ◽  
Volume Ratio ◽  
Indentation Size ◽  
Proportional Specimen Resistance ◽  
Low Load ◽  
Microhardness Testing ◽  
Hardness Increase

The role of friction between the microhardness indenter and the test specimen is addressed through the analysis of dry (unlubricated) and lubricated tests on iron by Atkinson and Shi. Quantitative evaluation through a proportional specimen resistance model accurately describes the results. It suggests that friction is a major portion of the observed hardness increase at low test loads, the indentation size effect. The ISE is related to the surface-area-to-volume ratio of the indentation, which is inversely related to the indentation dimension.

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