Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 376, Issue 2113, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsta.2017.0206
Keywords
undercooled growth; magnetic field; thermoelectric magnetohydrodynamics; numerical modelling
Categories
Funding
- International Exchanges Scheme of the Royal Society of the United Kingdom
- National Natural Science Foundation of China [51071043, 51211130113]
- Fundamental Research Funds for Central Universities [N09050901, N130509001]
- EPSRC [EP/K011413/1] Funding Source: UKRI
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In the undercooled solidification of pure metals, the dendrite tip velocity has been shown experimentally to have a strong dependence on the intensity of an external magnetic field, exhibiting several maxima and minima. In the experiments conducted in China, the undercooled solidification dynamics of pure Ni was studied using the glass fluxing method. Visual recordings of the progress of solidification are compared at different static fields up to 6 T. The introduction of microscopic convective transport through thermoelectric magnetohydrodynamics is a promising explanation for the observed changes of tip velocities. To address this problem, a purpose-built numerical code was used to solve the coupled equations representing the magnetohydrodynamic, thermal and solidification mechanisms. The underlying phenomena can be attributed to two competing flow fields, which were generated by orthogonal components of the magnetic field, parallel and transverse to the direction of growth. Their effects are either intensified or damped out with increasing magnetic field intensity, leading to the observed behaviour of the tip velocity. The results obtained reflect well the experimental findings. This article is part of the theme issue 'From atomistic interfaces to dendritic patterns'.
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