Effect of melt convection on primary dendrite arm spacing in directionally solidified Pb-26Bi hypo-peritectic alloys

Xiao Wu Hu; Shuang Ming Li; Si Feng Gao; Lin Liu; Heng Zhi Fu

doi:10.1016/S1003-6326(11)60679-1

Effect of melt convection on primary dendrite arm spacing in directionally solidified Pb-26Bi hypo-peritectic alloys

Xiao Wu Hu, Shuang Ming Li, Si Feng Gao, Lin Liu, Heng Zhi Fu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

14 Scopus citations

Abstract

Primary dendrite arm spacing (PDAS) of α phase in directionally solidified Pb-26Bi (mass fraction) hypo-peritectic alloys was measured by considering the effect of melt convection in cylindrical samples with different diameters. The experimental results show the measured PDAS increases with increasing diameter of the sample. At the growth velocity of 5 μm/s, its value changes from 161.5 μm for the sample with 1.8 mm in diameter to 240.4 μm for the sample with 7 mm in diameter. The strong melt convection in large diameter samples causes a high bulk alloy composition and a high concentration gradient in peritectic β phase, resulting in a larger PDAS. Simultaneously, the high concentration gradient could effectively promote the peritectic transformation, enhancing the dissolution of the thin a dendrite.

Original language	English
Pages (from-to)	65-71
Number of pages	7
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	21
Issue number	1
DOIs	https://doi.org/10.1016/S1003-6326(11)60679-1
State	Published - Jan 2011

Keywords

directional solidification
hypo-peritectic alloy
melt convection
Pb-26Bi
primary dendrite arm spacing

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10.1016/S1003-6326(11)60679-1

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title = "Effect of melt convection on primary dendrite arm spacing in directionally solidified Pb-26Bi hypo-peritectic alloys",

abstract = "Primary dendrite arm spacing (PDAS) of α phase in directionally solidified Pb-26Bi (mass fraction) hypo-peritectic alloys was measured by considering the effect of melt convection in cylindrical samples with different diameters. The experimental results show the measured PDAS increases with increasing diameter of the sample. At the growth velocity of 5 μm/s, its value changes from 161.5 μm for the sample with 1.8 mm in diameter to 240.4 μm for the sample with 7 mm in diameter. The strong melt convection in large diameter samples causes a high bulk alloy composition and a high concentration gradient in peritectic β phase, resulting in a larger PDAS. Simultaneously, the high concentration gradient could effectively promote the peritectic transformation, enhancing the dissolution of the thin a dendrite.",

keywords = "directional solidification, hypo-peritectic alloy, melt convection, Pb-26Bi, primary dendrite arm spacing",

author = "Hu, {Xiao Wu} and Li, {Shuang Ming} and Gao, {Si Feng} and Lin Liu and Fu, {Heng Zhi}",

year = "2011",

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doi = "10.1016/S1003-6326(11)60679-1",

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T1 - Effect of melt convection on primary dendrite arm spacing in directionally solidified Pb-26Bi hypo-peritectic alloys

AU - Hu, Xiao Wu

AU - Li, Shuang Ming

AU - Gao, Si Feng

AU - Liu, Lin

AU - Fu, Heng Zhi

PY - 2011/1

Y1 - 2011/1

N2 - Primary dendrite arm spacing (PDAS) of α phase in directionally solidified Pb-26Bi (mass fraction) hypo-peritectic alloys was measured by considering the effect of melt convection in cylindrical samples with different diameters. The experimental results show the measured PDAS increases with increasing diameter of the sample. At the growth velocity of 5 μm/s, its value changes from 161.5 μm for the sample with 1.8 mm in diameter to 240.4 μm for the sample with 7 mm in diameter. The strong melt convection in large diameter samples causes a high bulk alloy composition and a high concentration gradient in peritectic β phase, resulting in a larger PDAS. Simultaneously, the high concentration gradient could effectively promote the peritectic transformation, enhancing the dissolution of the thin a dendrite.

AB - Primary dendrite arm spacing (PDAS) of α phase in directionally solidified Pb-26Bi (mass fraction) hypo-peritectic alloys was measured by considering the effect of melt convection in cylindrical samples with different diameters. The experimental results show the measured PDAS increases with increasing diameter of the sample. At the growth velocity of 5 μm/s, its value changes from 161.5 μm for the sample with 1.8 mm in diameter to 240.4 μm for the sample with 7 mm in diameter. The strong melt convection in large diameter samples causes a high bulk alloy composition and a high concentration gradient in peritectic β phase, resulting in a larger PDAS. Simultaneously, the high concentration gradient could effectively promote the peritectic transformation, enhancing the dissolution of the thin a dendrite.

KW - directional solidification

KW - hypo-peritectic alloy

KW - melt convection

KW - Pb-26Bi

KW - primary dendrite arm spacing

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Effect of melt convection on primary dendrite arm spacing in directionally solidified Pb-26Bi hypo-peritectic alloys

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Keywords

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