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  • Enhancement of the upper critical field of Nb3Sn utilizing

    Elemental powders of niobium–tin and niobium–aluminum were mechanically alloyed by Spex ball mill, respectively, in order to fabricate disordered nanocrystalline Nb3Sn and Nb3Al. The solid

    Structural evolution in Nb3Sn during mechanical attrition

    15/07/1991· Summary Amorphization by high energy ball milling was observed in crystalline Nb3Sn compositions with Nb + Sn, Nb + NbSn2 or Nb3Sn starting powders. In the case of Nb + Sn and Nb + NbSn2 starting powders, milling first induced "M ' to form the A15 structure Nb3Sn phase which subsequently transformed to the amorphous structure. The ordered A15 Nb3Sn was found to dis- order completely at milling

    The synthesis and structure of nanocrystalline materials

    01/03/1993· An advantage of the use of ball milling is the possibility to introduce large strains and produce nanocrystalline structures in materials which exhibit no ductility under the usual conditions of deformation. A dramatic example of this behavior is the Nb3Sn intermetallic compound with the A15 crystal structure. Nb3Sn is extremely brittle and fails in the elastic stress regime at temperatures below 1200°C. Wright (44) has summarized deformation studies on A15 compounds such as Nb3Sn

    Atomic disorder in Nb3Sn during heavy mechanical impact

    Ball milling of an intermetallic compound may lead to amorphisation of the material. In order to observe what occurs in a material during the early stage of milling, mechanical grinding of the well-known superconductor Nb 3 Sn was studied. The change in the superconducting transition temperature as a function of milling time was used to monitor changes in the material. In the early stages of the

    Mechanical milling of ordered intermetallic compounds:

    07/05/1993· Similarly, Cho and Koch [10] determined that the LRO in ball-milled Nb3Sn disappeared after about 1 h of milling while amorphization was not initiated until 5-6 h of milling. 0925-8388/93/$6.00 1993- Elsevier Sequoia. All rights reserved 288 Y. S. Cho, C C. Koch / Mechanical milling of intermetallic compounds It was suggested that the additional stored energy required for the crystalline-to-amorphous transforma- tion in Nb3Sn

    Nanocrystals by high energy ball milling ScienceDirect

    01/05/1992· Nb a It had been established previously that ball-milling either powders of elemental Nb and Sn at the HIGH ENERGY BALL MILLING 209 ratio of Nb~Sn (14,15) or powder of the intermetallic compound NbaSn (16) resulted in complete amorphizatlon. It was found (15) that mechanical alloying of pure Nb and Sn powders first led to formation of the A15 structure Nb3Sn intermetallic compound.

    Atomic disorder in intermetallic compounds by mechanical

    25/03/1991· In the present paper we demonstrate disordering during ball-milling of two intermetallic com- pounds, namely Nb3Sn and CoGa. Nb3Sn crystal- lizes in the A15 structure and exhibits anti-site disorder under irradiation, resulting in an increase of the lattice parameter and a decrease of the superconducting transition temperature T~ [2]. CoGa crystallizes in the B2 structure and exhibits

    Enhancement of the upper critical field of Nb3Sn utilizing

    Nb 3 Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature T c,the concomitant electron scattering increased the upper critical field μ 0 H c 2 to as high as 35 T at 0 K,as determined by the Werthamer-Helfand-Hohenberg equation.

    (PDF) Site random superconductivity of A15 compound

    We performed mechanical milling of the A15-type superconductor Nb3Sn with transition temperature Tc = 18K. Tc decreased with increasing milling time, a result similar to that of Di, Loeff and

    Ball Mill: Operating principles, components, Uses

    A ball mill also known as pebble mill or tumbling mill is a milling machine that consists of a hallow cylinder containing balls; mounted on a metallic frame such that it can be rotated along its longitudinal axis. The balls which could be of different diameter occupy 30 50 % of the mill volume and its size depends on the feed and mill size. The large balls tend to break down the coarse

    Enhancement of the upper critical field of Nb3Sn utilizing

    23/11/2005· Title: Enhancement of the upper critical field of Nb3Sn utilizing disorder introduced by ball milling the elements. Authors: L. D. Cooley, Y. F. Hu, A. R Moodenbaugh (Submitted on 23 Nov 2005) Abstract: Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the

    Structural evolution in Nb3Sn during mechanical

    15/07/1991· The A15 Nb3Sn compound is extremely brittle at tempera- tures below 1000,but the increase in micro- hardness values observed in ball-milled Nb3Sn indicates that the Nb3Sn compound can be plas- tically deformed under the stress state existing during milling and this normally "brittle" struc- ture can store the energy of cold work. This will be discussed in the next section. The typical

    Atomic disorder in Nb3Sn during heavy mechanical impact

    Ball milling of an intermetallic compound may lead to amorphisation of the material. In order to observe what occurs in a material during the early stage of milling, mechanical grinding of the well-known superconductor Nb 3 Sn was studied. The change in the superconducting transition temperature as a function of milling time was used to monitor changes in the material.

    Atomic disorder in Nb3Sn during heavy mechanical impact

    Abstract Ball milling of an intermetallic compound may lead to amorphisation of the material. In order to observe what occurs in a material during the early stage of milling, mechanical grinding of the well-known superconductor Nb 3 Sn was studied. The change in the superconducting transition temperature as a function of milling time was used to monitor changes in the material.

    The use of mechanical alloying in the manufacture of

    Mechanical alloying, a high energy ball milling technique, was used to process elemental metal powders. Multifilamentary Cu-Nb3Sn composites were formed by mixing the mechanically alloyed Nb/Sn powders with Cu powders, isostatically compacting the mixture, hydrostatically extruding to wire form, and diffusion reacting to form the A15 superconducting compounds from the mechanically alloyed powders.

    Enhancement of the upper critical field of Nb3Sn utilizing

    Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the concomitant electron scattering increased the upper critical field μ0Hc2 to as high as 35T at 0K, as determined by the Werthamer-Helfand-Hohenberg equation. Hc2 was higher for longer milling times

    Enhancement of the upper critical field of Nb3Sn utilizing

    Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the conco...

    (PDF) Diffusion and growth mechanism of Nb3Sn

    The rather surprising position of the Kirkendall pores in Nb3Sn superconductor grown by bronze technique is clarified. It is shown that Sn is the fastest diffusing species, which seems to be unusual considering the crystal structure of Nb3Sn.

    ball milling of nb3sn English Girl gone Wayward

    technological Nb3Sn over a large range of applied strain (1 to +0.3 % ), a procedure for this objective was the optimisation of the ball milling process for Nb3Sn, as very little data on this existed previously. Work will also be presented on the effect of HIP parameters on . Get Price

    [PDF] Evidence that the upper critical field of Nb3Sn is

    Although 2011 marks the 50th anniversary of Nb3Sn as the first high field superconductor, real understanding of its upper critical field behavior Hc2 is incomplete. Here, we show surprising Hc2 data on highly homogeneous bulk samples that exhibit identical upper critical field Hc2(0.3 K) ∼ 29 ± 0.2 T with or without undergoing the cubic-to-tetragonal transition, a result in strong contrast

    The Effect of Mechanical Alloying on the Structural and

    Elemental powders of niobium and tin were mechanically alloyed using ball milling in order to fabricate disordered nanocrystalline Nb3Sn with an improved upper critical magnetic field, BC2. Disordered Nb3Sn powder of grain size (30 ±0.3) nm was successfully fabricated, as determined by Hall-Williamson analysis of broadened X-ray diffraction peaks. Measurements of the critical superconducting

    Enhancement of the upper critical field of Nb3Sn utilizing

    Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the conco...

    Enhancement of the upper critical field of Nb3Sn utilizing

    Enhancement of the upper critical field of Nb3Sn utilizing disorder introduced by ball mill_专业资料。Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the concomitant electron scattering increased the

    High-Field Nb3Sn Superconductors Prepared through a

    Abstract. Nb 3 Sn superconductors have been prepared through Nb 6 Sn 5 compound powder synthesized by a melt diffusion process from Nb and Sn powders. The Nb 6 Sn 5 powder was mixed with Nb powder in a ball mill. The resulting mixed powder was encased in a Ta tube, and fabricated into a tape. The mechanical mixing of Nb 6 Sn 5 and Nb powder promotes the formation of A15 Nb 3 Sn

    (PDF) Diffusion and growth mechanism of Nb3Sn

    The rather surprising position of the Kirkendall pores in Nb3Sn superconductor grown by bronze technique is clarified. It is shown that Sn is the fastest diffusing species, which seems to be unusual considering the crystal structure of Nb3Sn.

    Highlights of 2017 Superconductor Science and

    In some regions, these Ti flakes contain a supersaturation of Nb as a result of the energetic ball-milling process. The T c (8.1 K) and B c2 (9.8 T at 4.2 K) values of this as-milled material are slightly lower than those reported for Nb-47 wt%Ti due to the impurity content and lattice disorder. Sintering at 400 C leads to well consolidated, high density bulk samples, but annealing at

    Amorphization and disordering of the Ni3Al ordered

    The ordered fcc intermetallic compound Ni 3 Al was mechanically milled in a high energy ball mill. The severe plastic deformation produced by milling induced transformations with increasing milling time as follows: ordered fcc → 2; disordered fcc → 2; nanocrystalline fcc + amorphous. The milling time for complete disordering occurred at 5 h for stoichiometric Ni

    Ping Xiang Zhang Scientific.Net

    The effects of the ball-milling on the characteristic of the powder have been studied by XRD. The modality and distribution of 2212, Ca2CuO3 and CuO in the powder were observed by SEM. Results show that the Ca2CuO3 particle ground was about 200nm in size. The precursory powder with the non-superconducting phases distributed uniformly in the mixture powder was obtained for Bi-2223 long tape.

    ball milling cell lysis kapsalonkaat.nl

    ball milling of nb3sn. Densification and grain growth in BaTiO3 ceramics fabricated from nanopowders synthesized by ball-milling assisted hydrothermal reaction Journal of the European Ceramic Society Volume 28 Issue 3 2008 Pages 599-604 Yuji. Service Online; Bacterial Cell Disruption by Bead Beating. Bacterial Cell Disruption by Bead Beating Bacteria can be easily disrupted by treatment with

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    German jaw crusher machine manufacturers for sale grinding mill german imports jaw crusher crushing combines the advantages of similar products, hydraulic cone crusher device applied to the machine, made in germany. stone crushing machines manufacturers in germany. crushing and grinding machinery companies europages. Kenya used german mobile stone crushersStone Crusher. used german

    High-Field Nb3Sn Superconductors Prepared through a

    Abstract. Nb 3 Sn superconductors have been prepared through Nb 6 Sn 5 compound powder synthesized by a melt diffusion process from Nb and Sn powders. The Nb 6 Sn 5 powder was mixed with Nb powder in a ball mill. The resulting mixed powder was encased in a Ta tube, and fabricated into a tape. The mechanical mixing of Nb 6 Sn 5 and Nb powder promotes the formation of A15 Nb 3 Sn

    Enhancement of the upper critical field of Nb3Sn utilizing

    Enhancement of the upper critical field of Nb3Sn utilizing disorder introduced by ball mill_专业资料。Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the concomitant electron scattering increased the

    [PDF] Evidence that the upper critical field of Nb3Sn is

    Although 2011 marks the 50th anniversary of Nb3Sn as the first high field superconductor, real understanding of its upper critical field behavior Hc2 is incomplete. Here, we show surprising Hc2 data on highly homogeneous bulk samples that exhibit identical upper critical field Hc2(0.3 K) ∼ 29 ± 0.2 T with or without undergoing the cubic-to-tetragonal transition, a result in strong contrast

    A new paradigm for fabricating bulk high-field superconductors

    The milling was performed under argon gas with a niobium milling pot and niobium balls (6 × 20 mm and 6 × 10 mm diameter), and with an initial ball-to-powder weight ratio of ∼14:1. Ball milling was performed in 30 min cycles for the first 10 h of milling. After each 30 min cycle, the milling pot was opened under argon gas

    A new approach to fabricate superconducting NbTi

    26/07/2017· In some regions, these Ti flakes contain a supersaturation of Nb as a result of the energetic ball-milling process. The T c (8.1 K) and B c2 (9.8 T at 4.2 K) values of this as-milled material are slightly lower than those reported for Nb-47 wt%Ti due to the impurity content and lattice disorder. Sintering at 400 C leads to well consolidated, high density bulk samples, but annealing at

    Ping Xiang Zhang Scientific.Net

    The effects of the ball-milling on the characteristic of the powder have been studied by XRD. The modality and distribution of 2212, Ca2CuO3 and CuO in the powder were observed by SEM. Results show that the Ca2CuO3 particle ground was about 200nm in size. The precursory powder with the non-superconducting phases distributed uniformly in the mixture powder was obtained for Bi-2223 long tape.

    Study of TaB2 and SiC additions on the properties of MgB2

    13/01/2015· Rodrigues D Jr, Jiang J, Zhu Y, Voyles P, Larbalestier D C and Hellstrom E E 2009 Flux pinning optimization of MgB2 bulk samples prepared using high-energy ball milling and addition of TaB2 IEEE Trans. Appl. Supercond. 19 2797–801. Crossref Google Scholar

    Milling Environment Powder Metallurgy Beyond

    17/12/2020· Balls, mill chamber walls, and powder of the same metal do not weld together during milling. During nonreactive milling, the metal powder either reacts mildly or not at all with the milling fluid during milling. Powder particles weld together to a great extent during ball milling. Additionally, balls, mill chamber walls, and powder of the same metal may weld together during milling. Welding

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    MT26 Abstracts, Timetable and Presentations (22-27

    The detailed Technical Program can be accessed via the Timetable Views on the left. Late submissions are no longer accepted except for the extreme circumstance of presenting last minute, ground-breaking research. In such cases, please email your abstract to [email protected] and be sure to include the appropriate submission category. Abstracts will be sent to the Program Committee

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