Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy

L. M. Zhang; N. Li; R. Zhang; H. Xing; K. Song; J. Y. Wang

doi:10.1080/02670836.2016.1149677

Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy

L. M. Zhang, N. Li, R. Zhang, H. Xing, K. Song, J. Y. Wang

School of Physical Science and Technology

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

This paper investigated the effect of coupling of direct current (DC) and pulling rate on dendrites and cooling behaviours of directionally solidified Pb–50Sn alloy. Experimental results indicated that the secondary dendritic arm spacing (SDAS) decreased and temperature gradient increased as increasing current densities. Moreover, temperature rise and SDAS under positive DC were higher than those under negative DC. It was speculated that Joule heating and electromigration were obviously induced by the present DC. The effect of DC on the microstructure and solidification parameters was weakened as the pulling rate increases. The coarsening rate reduced from tf^1/3 toward a value of tf^0.29 when DC of ±200 A cm^–2 were applied. The refinement mechanism of SDAS was discussed.

Original language	English
Pages (from-to)	1877-1885
Number of pages	9
Journal	Materials Science and Technology
Volume	32
Issue number	18
DOIs	https://doi.org/10.1080/02670836.2016.1149677
State	Published - 11 Dec 2016

Keywords

Cooling behaviours
Dendrites
Direct current
Directional solidification

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10.1080/02670836.2016.1149677

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title = "Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy",

abstract = "This paper investigated the effect of coupling of direct current (DC) and pulling rate on dendrites and cooling behaviours of directionally solidified Pb–50Sn alloy. Experimental results indicated that the secondary dendritic arm spacing (SDAS) decreased and temperature gradient increased as increasing current densities. Moreover, temperature rise and SDAS under positive DC were higher than those under negative DC. It was speculated that Joule heating and electromigration were obviously induced by the present DC. The effect of DC on the microstructure and solidification parameters was weakened as the pulling rate increases. The coarsening rate reduced from tf1/3 toward a value of tf0.29 when DC of ±200 A cm–2 were applied. The refinement mechanism of SDAS was discussed.",

keywords = "Cooling behaviours, Dendrites, Direct current, Directional solidification",

author = "Zhang, {L. M.} and N. Li and R. Zhang and H. Xing and K. Song and Wang, {J. Y.}",

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TY - JOUR

T1 - Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy

AU - Zhang, L. M.

AU - Li, N.

AU - Zhang, R.

AU - Xing, H.

AU - Song, K.

AU - Wang, J. Y.

PY - 2016/12/11

Y1 - 2016/12/11

N2 - This paper investigated the effect of coupling of direct current (DC) and pulling rate on dendrites and cooling behaviours of directionally solidified Pb–50Sn alloy. Experimental results indicated that the secondary dendritic arm spacing (SDAS) decreased and temperature gradient increased as increasing current densities. Moreover, temperature rise and SDAS under positive DC were higher than those under negative DC. It was speculated that Joule heating and electromigration were obviously induced by the present DC. The effect of DC on the microstructure and solidification parameters was weakened as the pulling rate increases. The coarsening rate reduced from tf1/3 toward a value of tf0.29 when DC of ±200 A cm–2 were applied. The refinement mechanism of SDAS was discussed.

AB - This paper investigated the effect of coupling of direct current (DC) and pulling rate on dendrites and cooling behaviours of directionally solidified Pb–50Sn alloy. Experimental results indicated that the secondary dendritic arm spacing (SDAS) decreased and temperature gradient increased as increasing current densities. Moreover, temperature rise and SDAS under positive DC were higher than those under negative DC. It was speculated that Joule heating and electromigration were obviously induced by the present DC. The effect of DC on the microstructure and solidification parameters was weakened as the pulling rate increases. The coarsening rate reduced from tf1/3 toward a value of tf0.29 when DC of ±200 A cm–2 were applied. The refinement mechanism of SDAS was discussed.

KW - Cooling behaviours

KW - Dendrites

KW - Direct current

KW - Directional solidification

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DO - 10.1080/02670836.2016.1149677

M3 - 文章

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SN - 0267-0836

VL - 32

SP - 1877

EP - 1885

JO - Materials Science and Technology

JF - Materials Science and Technology

IS - 18

ER -

Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy

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Keywords

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