Microstructure and Mechanical Properties of Nano-Crystalline Al-Mg-Mn System

2010 ◽  
Vol 9 ◽  
pp. 61-68 ◽  
Author(s):  
A.A. Ebnalwaled ◽  
M. Abou Zied
Keyword(s):  
Mechanical Properties ◽  
Hardness Test ◽  
Micro Hardness ◽  
Line Broadening ◽  
X Ray ◽  
Nano Crystalline ◽  
Median Diameter ◽  
Ball Milling Technique ◽  
Mg Content ◽  
Vickers Hardness Test

Nano - crystalline Al-Mg-Mn was synthesized by ball milling technique. Microstructure of these alloys has been studied from X-ray line broadening. The crystallite size of nano - crystalline Al-Mg-Mn system decreases by increasing the Mg content, While the micro-strain, median diameter,, and geometrical standard deviations,  increases by increasing the Mg content. Micro-hardness of our system has been investigated by Vickers hardness test. The hardness increases by increasing the Mg content.

Synthesis and characterization of Co–B–Fe–Ti nanosized alloyed powders

2021 ◽  
Vol 112 (1) ◽  
pp. 35-41
Author(s):  
Hasan Eskalen ◽  
Mikail Aslan ◽  
Hakan Yaykaşlı ◽  
Musa Gögebakan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Solid Solution ◽  
Analytical Techniques ◽  
High Energy ◽  
Nanocrystalline Phase ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ball Milling Technique

Abstract In this study, novel Co60Fe18Ti18B4 alloy powders have been synthesized with high compositional homogeneity using a high-energy ball milling technique. The structural, morphological and mechanical properties of the nanosized alloyed powders were examined using different analytical techniques, including scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectrometry and X-ray diffraction. According to the X-ray diffraction analysis for both Co powder and Co60Fe18Ti18B4 alloy powders, with increasing milling time, the content of Co-based (hcp) solid solution decreased and Co-based (fcc) solid solution increased. The mechanical properties of the material were also investigated by Vickers micro-hardness testing. The micro-hardness value of the Co60Fe18Ti18B4 alloy was found as 120.08 HV. After sintering (1 h– 1000 °C), the hardness improved remarkably (536.32 HV). Furthermore, results indicate that the synthesized Co-based alloy powder has both glassy and nanocrystalline phase forms.

Micro-Hardness and Morphology of LDPE Influenced by Beta Radiation

2014 ◽  
Vol 606 ◽  
pp. 253-256 ◽  
Author(s):  
Martin Ovsik ◽  
Petr Kratky ◽  
David Manas ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hardness Test ◽  
Polymer Materials ◽  
Beta Radiation ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Depth Sensing ◽  
Surface Layers ◽  
Hardness Values ◽  
Different Doses

This article deals with the influence of different doses of Beta radiation to the structure and mico-mechanical properties of Low-density polyethylene (LDPE). Hard surface layers of polymer materials, especially LDPE, can be formed by radiation cross-linking by β radiation with doses of 33, 66 and 99 kGy. Material properties created by β radiation are measured by micro-hardness test using the DSI method (Depth Sensing Indentation). Individual radiation doses caused structural and micro-mechanical changes which have a significant effect on the final properties of the LDPE tested. The highest values of micro-mechanical properties were reached at radiation dose of 66 and 99 kGy, when the micro-hardness values increased by about 21%. The changes were examined and confirmed by X-ray diffraction.

Influence of Aging Treatments on the Structural and Mechanical Properties of AGS Alloy Wire Cold Drawn

2018 ◽  
Vol 18 ◽  
pp. 73-78
Author(s):  
Mokhtar Bayarassou ◽  
Mosbah Zidani ◽  
Hichem Farh
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Electron Microscope ◽  
Artificial Ageing ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Alloy Wire ◽  
X Ray ◽  
Plastic Deformation Rate ◽  
Scanning Electron

The scope of this work is to study of microstructural changes and mechanical properties during natural and artificial ageing treatment of AGS Alloy wire cold drawn with different deformation at ENICAB in Biskra. And as well to know the phase formation during different deformation of aluminum alloys wires. as well as the combined influence of the plastic deformation rate and the aging temperature. Wire section reduction shows a change in microstructure and texture. The methods of characterization used in this work are: scanning electron microscope and X-ray diffraction, micro hardness (Hv).

scholarly journals Structural Changes in the Aluminum - Magnesium System Alloy

2020 ◽  
Vol 989 ◽  
pp. 577-582
Author(s):  
I.E. Illarionov ◽  
T.R. Gilmanshina ◽  
A.A. Kovaleva
Keyword(s):  
Mechanical Properties ◽  
Structural Changes ◽  
Single Phase ◽  
Secondary Phases ◽  
Micro Hardness ◽  
System Alloy ◽  
Quenching Temperature ◽  
Monitor Screen ◽  
X Ray ◽  
Scanning Electron

The purpose of this work is to study the structure and mechanical properties of an aluminum – magnesium system alloy after various types of heat treatment (quenching and ageing). The microstructure of an alloy has been studied by means of Zeiss OBSERVER.D1m microscope combined with a camera and image display on a monitor screen. Micro X-ray spectral analysis was performed by means of Carl Zeiss EVO 50 scanning electron microscope. The micro-hardness of the samples has been measured on prepared metallographic sections by means of DM8 micro-hardness meter. In the course of the process it has been found that quenching the Al-12,78% Mg alloy from temperatures of 430–440 ° C does not lead to the formation of a single-phase solid solution. Ageing at 100 ° C enables the formation of secondary phases. It was noted that with an increase in the quenching temperature, the micro-hardness increases slightly. An increase in the exposure time doesn’t influence greatly the micro-hardness of the alloy, while the structure remains practically unchanged.

Lead-Free Cu-Si-Zn Brass with Tin Addition

2013 ◽  
Vol 802 ◽  
pp. 169-173 ◽  
Author(s):  
Sasiworada Puathawee ◽  
Siriporn Rojananan ◽  
Surasit Rojananan
Keyword(s):  
Silicon Content ◽  
Induction Furnace ◽  
Hardness Test ◽  
Graphite Crucible ◽  
Lead Free ◽  
Chemical Compositions ◽  
X Ray ◽  
Β Phase ◽  
Tin Content ◽  
Vickers Hardness Test

In this work, lead-free silicon brass (Cu-Si-Zn) with tin addition was studied to investigate on the comparative influence of the adding and non-adding tin on the microstructures and microhardness. In order to produce new alloy compositions, varied amount of silicon (0.5, 1.0, 2.0, 3.0 wt%) were incorporated. The ranges of chemical compositions were copper contents between 58.7 and 60.3 wt%, tin content 0.6 wt% and zinc remaining. The silicon brasses were prepared by melting pure elements with a graphite crucible using an induction furnace. The chemical composition of each alloy has been determined by X-ray fluorescence spectrometry (XRF). Microstructures of the as-cast silicon brass ingots have been observed by optical microscopy and scanning electron microscopy. The respective chemical analysis of the phases was determined by energy dispersive X-ray spectroscopy (EDS) and the hardness was measured by Vickers hardness test. The results revealed that the hardness of 60Cu-0.5Si-39.5Zn brass was 123.4 HV. The higher silicon content improved the higher hardness of samples. Moreover, the addition of tin together with silicon increased amount of beta (β) phase and more uniform dispersive gamma (γ) phase than those of the silicon addition alone. It could be concluded that the tin addition enhanced the hardness of lead-free Cu-Si-Zn brass and trended to be helpful for machining.

Mechanical Properties of Chemical Etched Biomedical NiTi Alloy Wires

2009 ◽  
Vol 417-418 ◽  
pp. 941-944
Author(s):  
Zhen Li ◽  
Zhao Qing Li ◽  
Li Da Hou ◽  
Li Li
Keyword(s):  
Mechanical Properties ◽  
Chemical Etching ◽  
Niti Alloy ◽  
Side Surface ◽  
Hardness Test ◽  
Tensile Tests ◽  
Etching Process ◽  
Phase Identification ◽  
Micro Hardness ◽  
Niti Wires

Nickel-titanium alloy wires are widely applied in manufacturing biomedical devices; however, it is difficult to be micro-fabricated. Chemical etching process can successfully micro-fabricate the Ni-Ti alloy. The surface morphology, the etching products and the mechanical properties of the fine NiTi wires after the chemical etching process are investigated in the paper. After etching process, the characteristics of the wire surface are studied by Scanning Electron Microscopy (SEM). The X-Ray Diffraction (XRD) phase identification analysis is used to identify the etching products on the side surface of the etched wire. The Vickers Micro-hardness Test shows that the micro-hardness in peripheral surface is slightly higher than that in bulk. Mechanical properties of NiTi alloy fine wires after etching were studied by means of tensile tests.

Study on Physical and Mechanical Properties of Cu/MoS2 Composites

2013 ◽  
Vol 575-576 ◽  
pp. 156-159
Author(s):  
Dou Qin Ma ◽  
Jing Pei Xie ◽  
Ji Wen Li ◽  
Ai Qin Wang ◽  
Wen Yan Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Diffraction Analysis ◽  
Electric Conductivity ◽  
Hot Pressing ◽  
Physical And Mechanical Properties ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vacuum Hot Pressing

Cu-3wt. %MoS2-7wt. %Mo and Cu-3wt. %MoS2 composites were prepared by repressing, re-sintering and vacuum hot pressing, respectively. Microstructures were characterized by optical metallographic microscope, EDS, SEM and X-ray diffraction analysis, respectively. The micro hardness, electric conductivity and density of samples were separately measured as well. Results show that the micro hardness of Cu-3wt. % MoS2-7wt. % Mo composites is about 33.3% higher than that of Cu-3wt. %MoS2 composites. The increase in micro hardness is attributed to the presence of Mo. The electric conductivity of Cu-3wt. %MoS2 and Cu-3wt. %MoS2-7wt. % Mo prepared by vacuum hot pressing were 80.6 % and 63.8% IACS, respectively, which is an increase compared with values of 80.2 % and 57.3% IACS of samples obtained by repressing and re-sintering.

scholarly journals Effects of TiO2/SiO2 Reinforced Nanoparticles on the Mechanical Properties of Green Hybrid Coating

2015 ◽  
Vol 47 ◽  
pp. 56-66 ◽  
Author(s):  
Mohammed Gobara
Keyword(s):  
Mechanical Properties ◽  
Sol Gel ◽  
Hardness Test ◽  
Silica Sol ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
X Ray ◽  
Hybrid Silica ◽  
Transmission Electron ◽  
Adhesion Performance

Titanium and silica oxides nanoparticles were introduced into hybrid silica sol–gel/epoxy coating to enhance the mechanical properties of coatings. Titanium dioxide (TiO2) and silica oxide (SiO2) were chemically synthesised before adding to the prepared silica sol gel coating. X-ray diffraction (XRD), Energy-dispersive x-ray analysis (EDX) and Transmission Electron microscope (TEM) were used to characterize the prepared nanoparticles. The coating was then applied to 3003 aluminium alloy (AA3003) surface. The adhesion performance of different sol gel coating compositions was investigated using shear test to define the influence of nanoparticles on adhesive strength of the coating. The Rockwell C hardness test was used to study the micro-hardness of different compositions of sol gel coating. Also, contact angel was used to investigate the hydrophobicity of the coatings. The results showed that there was a significant improvement of the adhesion performance of hybrid silica sol gel coating due to addition of TiO2 and the hydrophobicity of sol gel coating was increased due to addition of SiO2 nanoparticles.

scholarly journals Микротвердость и трещиностойкость оксида галлия

2019 ◽  
Vol 45 (21) ◽  
pp. 51
Author(s):  
В.И. Николаев ◽  
А.В. Чикиряка ◽  
Л.И. Гузилова ◽  
А.И. Печников
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Temperature ◽  
Vickers Hardness ◽  
Gallium Oxide ◽  
Hardness Test ◽  
Test Method ◽  
Vickers Hardness Test

The microhardness and the fracture toughness of two main polytypes of gallium oxide (a metastable α-Ga2O3 and thermodynamically stable high-temperature β-Ga2O3 phase) have been investigated. The measurements were carried out by the Vickers hardness test method. This is the first attempt to compare the mechanical properties of various polytypes of gallium oxide.

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