• Chem Soc Rev - RSC Publishing - Royal Society of Chemistry

    Apr 4 2013 kinetics and energetics between milling media during high- energy milling 6 Types of mills for high-energy milling A ball mill B planetary mill . C vibration differences between thermally and mechanically activated pro- cesses can be .. High-pressure torsion is a severe mechanical deformation.

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  • MRS_Bulletin-2010 Raabe Metals at extrem - Dierk Raabe

    drawing ball milling accumulative roll bonding damascene forging equal-channel angular extrusion and high-pressure torsion of multiphase materials.

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  • PDF (Free)

    such as ball milling (BM) 1 2) high pressure torsion (HPT) 3) ultrasonic shot . the surface of the specimen because of the friction between the specimen and ball. . The difference in the amount of strain to obtain the flow stress of 2.1GPa

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  • 2003 - LMT

    cobalt processed by high pressure torsion consolidation of ball milled powders. have been studied and compared to those induced simply by ball milling (BM). . The difference between the released enthalpy in DSC expts. and the elastic

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  • Effects of ball milling and high-pressure torsion for improving

    Effects of ball milling and high-pressure torsion for improving mechanical properties Among them use of BM can minimize agglomeration of the reinforcement

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  • Full Text PDF

    in a ball mill with reactions under well-de ned loading conditions and mechanochemical sure torsion experiments 5 . istry 8 the distinct difference between thermochem- ical and . plicity of the high pressure-torsion experiment allowed.

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  • Absolute concentration of free volume-type defects in ultrafine

    Among the important manifestations of excess volume in solids is the excess Measurements were performed with a high-precision vertical-difference Ultrafine-grained Fe was prepared by the technique of high-pressure torsion (HPT) 13 . . For nanocrystalline Fe prepared by ball-milling a value δGB = 0.019 nm is

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  • Grain boundary character distributions in nanocrystalline - arXiv

    5 Severely deformed powders produced by ball milling can bonding (ARB) equal channel angular pressing (ECAP) or high pressure torsion. . connections drawn between grain boundary character distribution and synthesis mechanism . a few key differences in composition and deformation history are also apparent.

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  • Article PDF - IOPscience

    Cu-Ag alloys produced by high-pressure torsion. K S Kormout B One of the disadvantages of ball milling is the undefined applied strain the Differences in the initial state of the material influence The applied pressure was between 5.

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  • Coupled phase transformations and plastic flows under torsion at

    (PTs) and plastic flow in a disk-like sample under torsion at high pressure in rotational diamond anvil cell silicon and boron carbides PTs during ball milling and high pressure .. The main difference between current formulation and formu-.

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  • Oxidation Resistance of Nanocrystalline 316L Stainless Steel

    Stainless Steel Processed by High Pressure Torsion .. Grain size difference between the center and periphery of an HPT sample can be seen in . for oxidation of microcrystalline and nanocrystalline (produced by high-energy ball milling.

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  • Microstructure and mechanical properties of CuxNb1вˆ x alloys

    by ball milling and high pressure torsion compacting grain sizes between 13–26 nm for the Cu-rich samples and 11–13 nm for the Nb-rich samples. The grain.

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  • Consolida on by equal channel angular extrusion - Ordem dos

    with ball milling allows the produc)on metastable alloys and composites. High Pressure Torsion (HPT). 6 . Rela)ve difference between ul)mate strength.

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  • full paper - Institute of Problems of Mechanical Engineering

    Mar 6 2005 pressing high-pressure torsion multi-forging ac- . pressure torsion and ball milling as well as their .. Thus the difference between.

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  • The Structure and Mechanical Properties of High-Strength Bulk

    May 19 2016 combination of high-energy ball milling and subsequent spark Research on nano-crystalline (with grain sizes between 10 and 100 nm) and of bulk materials by means of severe plastic deformation (SPD) techniques such as high-pressure torsion (HPT) 7 equal channel angular pressing (ECAP) 8

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  • Influence of hot pressing temperature on thermoelectric properties of

    May 26 2014 Keywords ball milling clathrates hot pressing thermoelectric and transport measurements samples are prepared in a high-frequency furnace annealed significant differences are seen in ZT as the positive effect of reduced pressure of p¼56 MPa was applied at the beginning of this .. torsion 23 .

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  • Library Without Walls - Los Alamos National Laboratory

    structure of CNTs and cause reaction between metallic matrices and CNTs 21 . combination of ball milling powder consolidation and high pressure torsion at Figures 2(a) and (b) illustrate that there are no significant differences in the

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  • Are processing conditions similar in ball milling and high-pressure

    Are processing conditions similar in ball milling and high-pressure torsion At each collision a small amount of powder is trapped between the colliding

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  • Stacking fault energies and slip in nanocrystalline metals Article

    May 23 2004 We will show that the interpretation of the cross-over between partial nucleation of the trailing partial will be a function of the energy difference ( italic gamma . Ball milling and high-pressure torsion are deformation methods

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  • Comparison of Two Powder Processing Techniques on the

    Oct 31 2013 The comparison between HPT and BM was carried out and compared . This difference in the duration of NbC formation by BM may be attributed HPT high pressure torsion BM SPS ball milling followed by spark plasma

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  • Downloadable Full Text - DSpace MIT

    coworkers used high pressure torsion to prepare a W specimen whose grain size was refined to about 170 nm mesh) in a SPEX 8000 high energy ball mill.

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  • Evolution of crystallite size lattice parameter and internal strain in Al

    precipitates during high energy ball milling of partly amorphous deformation techniques like cold rolling 3 high pressure torsion 4 equal induced using a ball mill where the number of impacts between the balls in the mill and the.

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  • FY2014 WPI Project Progress Report (Post-Interim Evaluation)

    May 15 2015 Ltd to build an HPS (High-Pressure Sliding) facility with a maximum capacity of . Although a small energy difference between the triplet .. (HPT) and ball milling) to produce different microstructural features. plastic deformation using groove rolling and high-pressure torsion Similarities and differences .

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  • Generation of metallic nanocomposites by severe plastic deformation

    Equal channel angular pressing (ECAP) high pressure torsion (HPT) and accumulative roll bonding (ARB) are the most established .. Ball milling and subsequent compaction and HPT .. However the differences between the composites

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  • Microstructural effects and large microhardness in cobalt processed

    Dec 8 2003 Microstructural effects and large microhardness in cobalt processed by high pressure torsion consolidation of ball studied and compared to those induced simply by ball milling (BM). However significant differences in the amount and type of faults accumulated are encountered between BM and HPT.

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  • MSE 440/540 Processing of Metallic Materials - Department of

    Diamond is metastable at room temperature and atmospheric pressure stable at higher temperatures (or pressure) e.g. a liquid or high temp allotrope Evaporation Among the differences which may result from rapid solidification are powder particles are trapped between the colliding balls during milling and undergo

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  • Nanostructured MgH2 obtained by cold rolling combined with short

    MgH2 was processed by short time high-energy ball milling (BM) and cold rolling severe plastic deformation (SPD) techniques such as High Pressure Torsion . However some differences in the kinetic behavior and shape between the

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  • Effect of Strain Path in High-Pressure Torsion Process on Hardening

    The effect of strain path in high-pressure torsion (HPT) process on hardening was investigated in commercial purity titanium (Ti-0.03Fe- nanometer-grained (NG) structure which is obtained by ball- milling (BM)15–18) and shot-peening (SP).11 19) Thus to form . difference of hardening behavior between CP-Ti and Fe-.

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  • Metal Alloys Hydrides and Molecular Solids - Sigma-Aldrich

    In the case of High Pressure Torsion (HPT) processing a powder or thin film Similarities between HPT and ball milling were evidenced in the recent work by . the effect of SPD is similar to that of mechanical milling with the major difference

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  • Mechanical properties of nanocrystalline materials

    of porosity the difference between tensile and compressive strength the .. particles in a dry high-energy ball mill until the desired composition is achieved. . disk produced by high pressure torsion together with the associated SADP for N

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  • Hydrogen storage of nanocrystalline Mg-Ni alloy processed by

    (SPD) techniques including high-pressure torsion (HPT) cold rolling (CR) and equal- Ball milling blend of commercial polycristalline Mg and Ni powders (supplied by Sigma- The difference between the measurement and fit is also plotted.

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