scholarly journals Control of surface micro−structure for Al alloy/polymer joining fabricated by laser process using Al−Ti−C powders: Effect of powder composition.

2021 ◽  
pp. 100068
Author(s):  
Seung−Gwang Kim ◽  
Asuka Suzuki ◽  
Naoki Takata ◽  
Makoto Kobashi
Keyword(s):  
Al Alloy ◽  
Micro Structure ◽  
Laser Process ◽  
Powder Composition ◽  
Polymer Joining

scholarly journals Experimental Research on Micro Structure And Mechanical Properties of Al Alloy Utilizing Sustainable Biomass As Quenching Medium

2019 ◽  
Vol 8 (11) ◽  
pp. 3695-3699
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Grain Refinement ◽  
Experimental Research ◽  
Al Alloy ◽  
Maximum Hardness ◽  
Micro Structure ◽  
Quenching Media ◽  
Cow Urine

Quenching media, time, temperature are prime factors towards the enhancement of grain refinement structure and mechanical properties in metals. The present study reports the usage of novel quenching media that is cow urine to improve the mechanical properties that is tensile strength, yield strength and hardness of Al 2585 alloy. The ingredients such as (sodium, nitrogen, sulphur, Vitamin A, B, C, D, E, minerals, manganese, iron, silicon, chlorine, magnesium etc.,) present in cow urine are homogenously which help to improve micro structure and mechanical properties of Al alloy 2585. From the study, it is revealed that maximum tensile strength and yield strength is improved and grain refinement is exhibited at 50% blend. Likewise maximum hardness at 80% blends.

scholarly journals Preparation of Superhydrophobic Surfaces Based on Rod-Shaped Micro-Structure Induced by Nanosecond Laser

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1274
Author(s):  
Zhi Li ◽  
Gang Xue ◽  
Yanming Wu ◽  
Xinghua Wang ◽  
Hengpei Pan
Keyword(s):  
Surface Oxidation ◽  
Frictional Resistance ◽  
Superhydrophobic Surfaces ◽  
Major Influence ◽  
Nanosecond Laser ◽  
Al Alloy ◽  
Ti Alloy ◽  
Micro Structure ◽  
Coefficient Of Thermal Conductivity ◽  
Layer Effect

Solid–liquid frictional resistance is mainly attributed to the adhesion caused by the boundary layer effect. Superhydrophobic surfaces are expected to be an effective method to reduce frictional resistance. In this paper, a rod-shaped micro-structure was prepared on surfaces of Al alloy (5083) and Ti alloy (TC4) by line-by-line scanning with nanosecond laser. The inherent properties of the metal materials—such as their coefficient of thermal conductivity (CTC) and specific heat capacity (SHC)—had a major influence on the surface morphology and shape size of the rod-shaped micro-structure. Both two metals showed apparent oxidation on their surfaces during laser ablation, however, the degree of surface oxidation of the Al alloy was greater than that of the Ti alloy due to its more fragmentary rod-shaped micro-structure. The laser-treated surfaces could turn from hydrophilic to hydrophobic or even superhydrophobic after being left in the air for 20 days, which might be caused by the adsorption of low-surface energy matter in the air. In addition, the contact angle of the Al alloy was larger than that of the Ti alloy, which is due to the larger ratio of height to width of the micro–nano composite rod-shaped micro-structure on the surface of the Al alloy.

Study about Stress-Strain Properties with Mini Specimen and Microstructure of Nuclear Fuel Element Cladding of Al-Alloy (98% Al + 1% Fe + 1% Ni) after Being Tempered at Temperatures between (100 – 650) °C

2015 ◽  
Vol 752-753 ◽  
pp. 119-124
Author(s):  
Usman Sudjadi ◽  
M. Husna Al Hasa
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Tensile Test ◽  
Nuclear Fuel ◽  
Al Alloy ◽  
Micro Structure ◽  
Stress Strain ◽  
Tempering Temperature ◽  
Fuel Elements ◽  
Scanning Electron

Stress-strain properties with mini specimen and micro structure of nuclear fuel elements cladding of Al-alloy (98% Al + 1% Fe + 1% Ni) after tempered at temperatures (100-650) °C, for 1 hour have been studied. Al-alloy (98% Al + 1% Fe + 1% Ni) was made for cladding nuclear fuel elements of research reactor. Al-alloy (98% Al + 1% Fe + 1% Ni) as cladding material has been on the rollers and then made a mini specimen tensile test samples. The mini specimen tensile test samples were tempered at temperatures of (100-650) °C, respectively 1 hour. Samples were tested to determine properties of tensile stress-strain with a mini-tensile test specimen. The tensile test equipment can attract maximum sample 5 kN, Shimadzu Autograph AGS-brand artificial 5kN, made in Japan. Then the samples were broken section micro structure observed by SEM (Scanning Electron Microscope). Quantitative results showed that the higher the tempering temperature, the maximum stress is decreased. The higher the tempering temperature cleavage fracture increasingly overlaps (small). This is due to the self-diffusion of Al atoms in the material when the sample tempered at (100-650) °C, for 1 hour. Observation of the microstructure by SEM (Scanning Electron Microscope) was visible presence of porosity in the sample.

scholarly journals Tensilel Properties of AA6061-T6/SiCp Surface Metal Matrix Composite Produced By Friction Stir Processing

2011 ◽  
pp. 125-129
Author(s):  
Devaraju Aruri ◽  
Adepu Kumar ◽  
B Kotiveerachary
Keyword(s):  
Tensile Properties ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Al Alloy ◽  
Micro Hardness ◽  
Nugget Zone ◽  
Micro Structure ◽  
Friction Stir ◽  
Sic Particles

In this experiment, Friction stir process (FSP) was attempted to incorporate micron-sized SiC particles 20μm in average size into the commercially AA6061-T6 to form surface particulate metal matrix composite. Micro structure observations were carried out by scanning electron microscope (SEM) in the nugget zone. Mechanical properties include micro hardness behavior and tensile properties were evaluated. From the results, SEM micro structure shows that the SiC particles are uniformly distributed in nugget zone without any defect. The micro hardness of nugget zone with SiC particles is higher than the as-received Al alloy. Tensile properties of the FSPed composite were reduced as compared to the as-received Al alloy.

Effets of surfaces on precipitate morphology in irradiated thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 654-655
Author(s):  
D.I. Potter ◽  
A. Taylor
Keyword(s):  
Ion Irradiation ◽  
Dark Field Image ◽  
Thin Foil ◽  
Dark Field ◽  
Al Alloy ◽  
Bright Field Image ◽  
Dislocation Loops ◽  
Precipitate Morphology ◽  
Thin Foils

Thermal aging of Ni-12.8 at. % A1 and Ni-12.7 at. % Si produces spatially homogeneous dispersions of cuboidal γ'-Ni3Al or Ni3Si precipitate particles arrayed in the Ni solid solution. We have used 3.5-MeV 58Ni+ ion irradiation to examine the effect of irradiation during precipitation on precipitate morphology and distribution. The nearness of free surfaces produced unusual morphologies in foils thinned prior to irradiation. These thin-foil effects will be important during in-situ investigations of precipitation in the HVEM. The thin foil results can be interpreted in terms of observations from bulk irradiations which are described first.Figure 1a is a dark field image of the γ' precipitate 5000 Å beneath the surface(∿1200 Å short of peak damage) of the Ni-Al alloy irradiated in bulk form. The inhomogeneous spatial distribution of γ' results from the presence of voids and dislocation loops which can be seen in the bright field image of the same area, Fig. 1b.

Small Angle Electron Scattering From Vacuum Condensed Metallic Films

1968 ◽  
Vol 26 ◽  
pp. 380-381
Author(s):  
J. Silcox ◽  
R. H. Wade
Keyword(s):  
Electron Scattering ◽  
Small Angle ◽  
Ring Structure ◽  
Two Dimensional ◽  
Metallic Films ◽  
Micro Structure ◽  
Angle Scattering ◽  
The Fourier Transform ◽  
Source Of Information ◽  
Kinematical Theory

Recent work has drawn attention to the possibilities that small angle electron scattering offers as a source of information about the micro-structure of vacuum condensed films. In particular, this serves as a good detector of discontinuities within the films. A review of a kinematical theory describing the small angle scattering from a thin film composed of discrete particles packed close together will be presented. Such a model could be represented by a set of cylinders packed side by side in a two dimensional fluid-like array, the axis of the cylinders being normal to the film and the length of the cylinders becoming the thickness of the film. The Fourier transform of such an array can be regarded as a ring structure around the central beam in the plane of the film with the usual thickness transform in a direction normal to the film. The intensity profile across the ring structure is related to the radial distribution function of the spacing between cylinders.

A microscopic marker experiment study on high temperature oxidation of Ni-Al alloy

1986 ◽  
Vol 44 ◽  
pp. 514-515
Author(s):  
Shou-kong Fan
Keyword(s):  
Transport Mechanism ◽  
High Temperature Oxidation ◽  
Transverse Section ◽  
Al Alloy ◽  
Metal Interface ◽  
Electron Microscopic ◽  
Temperature Oxidation ◽  
Analytical Electron ◽  
Microscopic Studies ◽  
First Time

Transmission and analytical electron microscopic studies of scale microstructures and microscopic marker experiments have been carried out in order to determine the transport mechanism in the oxidation of Ni-Al alloy. According to the classical theory, the oxidation of nickel takes place by transport of Ni cations across the scale forming new oxide at the scale/gas interface. Any markers deposited on the Ni surface are expected to remain at the scale/metal interface after oxidation. This investigation using TEM transverse section techniques and deposited microscopic markers shows a different result,which indicates that a considerable amount of oxygen was transported inward. This is the first time that such fine-scale markers have been coupled with high resolution characterization instruments such as TEM/STEM to provide detailed information about evolution of oxide scale microstructure.

Diffraction study on bainite of Cu-Al alloy

1990 ◽  
Vol 48 (4) ◽  
pp. 1006-1007
Author(s):  
Delu Liu ◽  
T. Ko
Keyword(s):  
Diffraction Study ◽  
Parent Phase ◽  
Al Alloy ◽  
Alloy Sample ◽  
Bright Field Image ◽  
Hexagonal System ◽  
Iced Brine ◽  
Diffraction Patterns ◽  
Zone Pattern ◽  
Stacking Structure

Structure of bainite in Cu-Al and Cu-Zn-Al alloys has been reported as 3R, 9R or 18R long period stacking structure (LPS) by X-ray and electron diffraction studies. In the present work, a Cu-25.5 (at)% Al alloy sample was heated at 900°C for 2 h then isothermally held at 450°C for 60 s before quenching into iced brine. FIG.1 shows a TEM bright field image of bainite plates (marked B) grown from grain boundary. The parent phase ( with DO3 structure ) has transformed to martensite (marked M ) during cooling from 450° C to 0°C. Both bainite and martensite plates have dense striations inside.Careful diffraction study on a JEOL 2000FX TEM with accelerating voltage 200 KV revealed (FIG.2) that the diffraction patterns contai_ning the same zone axis [001] ( hexagonal index ) or [111]c ( cubic index ) are from a bainite plate with obtuse V-shape. They are indexed as [010], [140], [130], [120], [230], [340] and [110] zone pattern for hexagonal system respectively.

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