Intermediate Phase Growth of Mg-Al Diffusion Couple under a Strong Static Magnetic Field

2007 ◽  
Vol 546-549 ◽  
pp. 491-494 ◽  
Author(s):  
Jie Dong ◽  
Z.F. Li ◽  
Xiao Qin Zeng ◽  
Wen Jiang Ding
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Diffusion Couple ◽  
Static Magnetic Field ◽  
Intermediate Phase ◽  
Thickness Measurement ◽  
Magnetic Field Direction ◽  
Diffusion Couples ◽  
Phase Growth ◽  
Intermediate Phases

Intermediate phase growth in Mg-Al diffusion couples were studied with different intensity of a strong static magnetic field from 0 to 10 Tesla. Thickness measurement of the intermediate phases (Mg17Al12 and Al3Mg2) shows that with the increasing of magnetic field intensity, the growth rate of both intermediate phases is retarded. The decrease of the phase growth rate is ascribed to the suppressed Al, Mg atom interdiffusion in the diffusion couple under the static magnetic field. It is also found that the orientation relationship between couple interface and magnetic field direction has no influence on the growth of intermediate phases.

Influence of strong static magnetic field on intermediate phase growth in Mg–Al diffusion couple

2007 ◽  
Vol 440 (1-2) ◽  
pp. 132-136 ◽  
Author(s):  
Z.F. Li ◽  
J. Dong ◽  
X.Q. Zeng ◽  
C. Lu ◽  
W.J. Ding ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Diffusion Couple ◽  
Static Magnetic Field ◽  
Intermediate Phase ◽  
Phase Growth

Influence of High Magnetic Field on Intermediate Phase Growth in Mg-Al Diffusion Couple

PRICM ◽  
2013 ◽  
pp. 1277-1282
Author(s):  
Chunyan Ban ◽  
Chuhan Wang ◽  
Yimeng Hu ◽  
Lian Liu ◽  
Jianzhong Cui
Keyword(s):  
Magnetic Field ◽  
Diffusion Couple ◽  
High Magnetic Field ◽  
Intermediate Phase ◽  
Phase Growth

Effect of high magnetic field on intermetallic phase growth in Ni–Al diffusion couples

2009 ◽  
Vol 472 (1-2) ◽  
pp. 525-529 ◽  
Author(s):  
Xiao Ren ◽  
Guo-Qing Chen ◽  
Wen-Long Zhou ◽  
Cheng-Wei Wu ◽  
Jun-Shan Zhang
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Intermetallic Phase ◽  
Diffusion Couples ◽  
Phase Growth

Filamentation instability in a collisional magnetoplasma with thermal conduction

2009 ◽  
Vol 75 (4) ◽  
pp. 563-573 ◽  
Author(s):  
MAHENDRA SINGH SODHA ◽  
MOHAMMAD FAISAL
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Static Magnetic Field ◽  
Power Loss ◽  
Thermal Conduction ◽  
Ohmic Heating ◽  
Wave Number ◽  
Main Beam ◽  
Rate Of Growth ◽  
Filamentation Instability

AbstractThis paper presents an analysis of the spatial growth of a transverse instability, corresponding to the propagation of an electromagnetic beam, with uniform irradiance along the wavefront in a collisional plasma, along the direction of a static magnetic field; expressions have been derived for the rate of growth, the maximum value of the rate of growth and the corresponding value of the wave number of the instability. The instability arises on account of the ejection of electrons from regions where the irradiance of the perturbation is large. The energy balance of the electrons taking into account ohmic heating and the power loss of electrons on account of (i) collisions with ions and neutral species and (ii) thermal conduction has been taken into account for the evaluation of the perturbation in electron temperature, which determines the subsequent growth of the instability. Further, the relationship between the electron density and temperature, as obtained from the kinetic theory, has been used. The filamentation instability becomes enhanced with the increase of the static magnetic field for the extraordinary mode while the reverse is true for the ordinary mode. Dependence of growth rate on irradiance of the main beam, magnetic field and a parameter proportional to the ratio of power loss of electrons by conduction to that by collisions has been numerically studied and illustrated by figures. The dependence of the maximum growth rate and the corresponding optimum value of the wave number of the instability on the irradiance of the main beam has also been studied. The paper concludes with a discussion of the numerical results, so obtained.

Formation of c-Axis Aligned Hydroxyapatite Sheet by Simultaneous Imposition of High Magnetic Field and Mold Rotation During Slip Casting Process

2006 ◽  
Vol 309-311 ◽  
pp. 53-56 ◽  
Author(s):  
Jun Akiyama ◽  
Masami Hashimoto ◽  
Hiroaki Takadama ◽  
Fukue Nagata ◽  
Yoshiyuki Yokogawa ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Materials ◽  
High Magnetic Field ◽  
Static Magnetic Field ◽  
Slip Casting ◽  
Casting Process ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
Hydroxyapatite Crystal ◽  
Crystal Alignment

A high magnetic field is a useful tool to control the crystal alignment of non-magnetic materials such as ceramics and polymers. In the case of Hydroxyapatite crystal, the a,b-axis is aligned parallel to the direction of an imposed magnetic field. This fact implies that the alignment of the c-axis is not controllable only using a high static magnetic field due to the freedom of the c-axis in a plane perpendicular to a magnetic field direction. In this study, a high static magnetic field and mold rotation was simultaneously so applied during a slip casting process as to align the c-axis of HAp poly crystals.

Stimulated backscattering of electromagnetic ordinary waves from extraordinary waves below the upper hybrid frequency

1979 ◽  
Vol 21 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Behrooz Maraghechi ◽  
Joseph E. Willett
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Static Magnetic Field ◽  
Inhomogeneous Plasma ◽  
Extraordinary Wave ◽  
Threshold Power ◽  
Ordinary Wave ◽  
Homogeneous Plasma ◽  
Parametric Decay ◽  
Hybrid Frequency

The parametric decay of an intense electromagnetic ordinary wave, propagating perpendicular to a uniform static magnetic field, into an extraordinary wave and a backscattered ordinary wave is investigated. Formulae are derived for the growth rate and threshold power associated with the instability in a homogeneous plasma. An analysis of the spatial amplification of the decay waves in an inhomogeneous plasma is presented. The effects of the uniform static magnetic field on the backscattering in both homogeneous and inhomogeneous plasmas are studied numerically.

Intermediate Phase Nucleation at Diffusion Couple Boundaries

1993 ◽  
Vol 321 ◽  
Author(s):  
J. J. Hoyt
Keyword(s):  
Nucleation Rate ◽  
Critical Nucleus ◽  
Intermediate Phase ◽  
Variational Procedure ◽  
Nucleus Size ◽  
Diffusion Couples ◽  
Intermediate Phases ◽  
Self Consistent ◽  
Phase Nucleation

ABSTRACTThe nucleation of intermediate phases at the interphase boundary in diffusion couples is examined theoretically. A variational procedure is described which allows for a self consistent determination of the critical nucleus size and shape, the work of formation of the critical nucleus and the nucleation rate.

scholarly journals Improvement of SiC Crystal Growth Rate and Uniformity via Top-Seeded Solution Growth under External Static Magnetic Field: A Numerical Investigation

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 651
Author(s):  
Minh-Tan Ha ◽  
Le Van Lich ◽  
Yun-Ji Shin ◽  
Si-Young Bae ◽  
Myung-Hyun Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Fluid Flow ◽  
Crystal Growth ◽  
Static Magnetic Field ◽  
Crystal Surface ◽  
Solution Growth ◽  
Helmholtz Coils ◽  
External Static Magnetic Field ◽  
Top Seeded Solution Growth

Silicon carbide (SiC) is an ideal material for high-power and high-performance electronic applications. Top-seeded solution growth (TSSG) is considered as a potential method for bulk growth of high-quality SiC single crystals from the liquid phase source material. The crystal growth performance, such as growth rate and uniformity, is driven by the fluid flow and constitutional flux in the solution. In this study, we numerically investigate the contribution of the external static magnetic field generated by Helmholtz coils to the fluid flow in the silicon melt. Depending on the setup of the Helmholtz coils, four static magnetic field distributions are available, namely, uniform vertical upward/downward and vertical/horizontal cusp. Based on the calculated carbon flux coming to the crystal surface, the vertical downward magnetic field proved its ability to enhance the growth rate as well as the uniformity of the grown crystal.

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