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Effects Of Atmosphere And Milling Time On The Coarsening Of

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US Patent for Method of producing nanophase WC/TiC/Co

The present invention relates to a method of producing nanophase WC/TiC/Co composite powder by means of a mechano-chemical process comprising a combination of mechanical and chemical methods For this purpose the present invention provides a method of producing nanophase WC/TiC/Co composite powder said method comprising as follows a process

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CORROSION RESISTANCE EVALUATION OF THE DIFFERENT

2) at the grain boundaries in the 7475 alloy and to the coarsening of S phase (AlCuMg) precipitates in the 2024 alloy both processes favoured by the thermome-chanical effects in these specific zones as demonstrated by TEM analysis Keywords FSW aluminium alloys localized corrosion microstructure EIS

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Hardening and Thermal stability of nanocrystalline AlMg4 8

8 h milling time and subsequently annealed powders were carried out by means of a differential scanning calorimeter DSC 204/F1 Phoenix from Net zsch The powders were sealed in Al pans and investigated at a heating rate of 10 K/min in flowing nitrogen atmosphere Also heating rates of 5 and 20 K/min were applied in the as -milled state

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Structure and properties of Al–Mg mechanical alloys

milling was carried out until the mechanical alloy showed no structural or compositional changes with in-creasing milling time Optimum milling parameters re-quired to achieve this stationary state in a minimum amount of time were determined in a series of separate experiments before actual sample preparation was begun

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Effects of atmosphere and milling time on the coarsening

Effects of atmosphere and milling time on the coarsening of copper powders during mechanical milling The coarsening behavior of copper nanopowders (50–150 nm in size) during mechanical milling was investigated as a function of milling atmosphere and milling time

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NANO MATERIALS

Mechanical milling is typically achieved using high energy shaker planetary ball or tumbler mills The energy transferred to the powder from refractory or steel balls depends on the rotational (vibrational) speed size and number of the balls ratio of the ball to powder mass the time of milling and the milling atmosphere

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Effects of ball milling time on the synthesis and

Effects of ball milling time on the synthesis and consolidation of nanostructured WC–Co composites The magnitude of contamination appears to depend on the time of milling the milling intensity milling atmosphere the effects of milling time on the synthesis of WC–10 wt% Co powder were investigated by using a dry

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US Patent Application for Rare

A rare-earth alloy ingot is produced by melting an alloy composed of 20-30 wt % of a rare-earth constituent which is Sm alone or at least 50 wt % Sm in combination with at least one other rare-earth element 10-45 wt % of Fe 1-10 wt % of Cu and 0 5-5 wt % of Zr with the balance being Co and quenching the molten alloy in a strip casting process

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Metallurgical Processes and Defects in Steel Products

Metallurgical Processes and Defects in Steel Products Defects in steel products are defined as These are very fine internal cracks of circular shape They develop and extend with time and are associated with the presence of These are the result of weld metal contamination by substances on the surface of the joint or by the atmosphere

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Toxic components of automobile exhaust gases their

The time has come to give serious consideration to the question of whether the increase in the number of automobiles is dangerous for man considering the fact that the exhaust gases of automobile engines contain large amounts of poisonous substances

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Ball milling of stainless steel scrap chips to produce

Ball milling of stainless steel scrap chips to produce nanocrystalline powder M H Enayati M R Bafandeh S Nosohian Received continuously with ball milling time until a saturation size is approached effects of crystallite size and strain [7]

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APT tomographic atom probe atom probe tomography

the tomographic atom probe provides fundamental new insights for advanced alloy design by probing the chemcial nature of single atoms in complex engineering materials Atom probe samples can be prepared by electrochemical polishing or focused ion beam and subsequent further sharpening using a focused ion beam device

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Dispersion of CNTs in Aluminum 2024 Alloy by Milling

Elemental powders and carbon nanotubes (CNTs) were mixed and milled in a high energy shaker mill (SPEX-8000M) to produce 2024 aluminum (Al2024) matrix composites reinforced with CNTs Milled products were consolidated by uniaxial load pressing followed by pressure-less sintering under argon atmosphere for 2 h at 773 K The effect of CNTs

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Modeling Preparation and Elemental Doping of

After high-energy ball milling for 12 h At the same time the production process is preferably taken under an inert atmosphere or additives can be used to suppress the unfavorable reaction Then the inhibition and mechanism of the lithium dendrite problem need further investigation

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Effects of Ti alloying of AlCrN coatings on thermal

Effects of Ti alloying of AlCrN coatings on thermal stability and oxidation resistance R Forsn1* M P Johansson1 2 M Odn1 and N Ghafoor1 1Nanostructured Materials Department of Physics Chemistry and Biology (IFM) Linkping University 581 83 Linkping Sweden 2Seco Tools AB 73782 Fagersta Sweden

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US3814635A

method of producing dispersion strengthened superalloys having improved high stress-repture properties at elevated temperatures wherein a powder metallurgy product processed so as to eliminate fine grains is hot worked to produce a metallurgical structure characterized by coarse elongated grains

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Journal of the American Ceramic Society •

The effects of steam pressure Densification was achieved by sintering at 1050C in ambient atmosphere but grain coarsening was observed for higher temperatures and longer (800‐0 02 psi) in absolute pressure The time evolution of mechanical equilibrium of the porous materials at low pressure and high‐temperature conditions

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Effects of the Surface Roughness on Sliding Angles of

1-6-2000Effects of the Surface Roughness on Sliding Angles of Relationship between Wetting Hysteresis and Contact Time of a Bouncing Droplet on Hydrophobic Surfaces Wetting characteristics of bare micro-patterned cyclic olefin copolymer surfaces fabricated by ultra-precision raster milling RSC Advances 2016 6 (2

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Precipitation strengthening in an ultralight magnesium

1-3-2019Body-centred cubic magnesium-lithium-aluminium-base alloys are the lightest of all the structural alloys with recently developed alloy compositions showing a unique multi-dimensional property profile By hitherto unrecognised mechanisms such alloys also exhibit exceptional immediate strengthening after solution treatment and water

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Synthesis and characterization of nearly monodisperse CdE

1-5-2002Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals These metrics are regularly updated to reflect usage leading up to the last few days Citations are the number of other articles citing this

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Size effects on the hydrogen storage properties of

Size effects on the hydrogen storage properties of nanoscaffolded Li3BN2H8 Hui Wu 1 2 WeiZhou 2 KeWang3 Terrence J Udovic John J Rush1 2 Taner Yildirim1 4 Leonid A Bendersky3 Adam F Gross 5 Sky L Van Atta JohnJVajo5 Frederick E Pinkerton 6and Martin S Meyer 1 NIST Center for Neutron Research National Institute of Standards and Technology

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Evaluation of Characteristics of Interfacial Phases

The parameters are milling time to fabricate Ni 3 Al method of mixing of Ni 3 Al and Al powders compaction pressure and sintering temperature The composite studied in this research was Al/5 Vol% Ni 3 Al made from two different types of Ni 3 Al powders

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NAVER 학술정보 Effects of atmosphere and milling time

The coarsening behavior of copper nanopowders (50–150nm in size) during mechanical milling was investigated as a function of milling atmosphere and milling time Pure copper powders were milled under argon and air atmospheres for up to 80h and the crystal structure microstructure and composition of the milled powders were investigated It

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Mechanical alloying of platinum with 5% ZrO nanoparticles

wires and blended with platinum (Pt) powders (44 μm) for 2−72 h in ambient atmosphere The Pt particle size followed the typical decreasing trend of the normal ball milling process up to 48 h but particle agglomeration was observed at 72 h The grain size evolution was similar to that of the particle size dropping down to around 50 nm at

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the functions and structure of ball mill

Ball milling technique was used to generate structural changes on the biochar locally stable structures within the char function of ball milling time 2018 PDF This project is to design and fabrie a mini ball mill that can grind coarsening of the grain structure on the other has to be made

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Applied Surface Science (v 182 #3

These include X-ray microscopy microdiffraction imaging and X-ray scattering Examples will be presented of nanostructured systems of interest where such studies are being used to study the effects of nanoconfinement in one two and three dimensions These include magnetic films magnetic dots quantum wells nanowires etc

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High

950 C or 98% of the solidus temperature only leading to coarsening of the average grain size to 54 nm The enhanced thermal stability can be connected to both a reduction in grain boundary energy with doping as well as the precipitation of ZrC particles High mechanical strength is retained even after

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bor dergi si

MM was conducted for 4 h in ethanol (wet milling) and Argon atmosphere (dry milling) using a high-energy ball mill WSi2 was used with different amounts (0 5 10 and 20 wt %) in order to investigate its effect on the resultant products MM'd powders were compacted using CIP under a

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Effects of atmosphere and milling time on the coarsening

Highlights •Effect of milling atmosphere on coarsening behavior of Cu nanopowders was studied •Influence of milling time on coarsening behavior of Cu nanopowders was studied •In air atmosphere the particle size was large as compared to argon

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Carbothermal Synthesis of Spherical AlN Fillers

5-11-20182 5 Effects of reaction time To investigate the effects of reaction time on the morphology of AlN products the raw materials with 5 wt % CaF 2 were heated at 1800C and under the N 2 pressure of 1 MPa for various reaction times (0 5 1 2 and 4 h) Figure 7 shows the SEM images of the as-synthesized powders

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Field‐Assisted Sintering Technology/Spark Plasma Sintering

After a description of its working principles and historical background mechanical thermal electrical effects in FAST/SPS are presented along with the role of atmosphere A selection of successful materials development including refractory materials nanocrystalline functional ceramics graded and non‐equilibrium materials is then discussed

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Effect of Laser Shock Peening on the Microstructures and

effects of compressive residual stresses and plastic deformation atmosphere with a ball-to-powder mass ratio of 5 1 (Model Pulverisette 7 Fritsch ) To prevent overheating ball milling was interrupted every 50min for a 20min cooling Consolidation of the mechanically alloyed powders was performed in an SPS system (Model SPS 10–4

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Modeling of particle size evolution during mechanical milling

8-7-2019The process of mechanical alloying (MA) involves the repeated deformation welding and fracture of powder materials during grinding in high-energy mills During MA the size and size distribution of the particles change as a result of the particles' different fracture and welding rates The

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KM Group Research

Investigate mechanical properties and time-dependent deformation behavior as a function of temperature (the heating stage go up to 400C) High resolution scanning probe microscopy (SPM) imaging enables topographical visualization of the sample surface precise test positioning accuracy and observation of post-test deformation behavior

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