Rapid eutectic growth in undercooled Al-Ge alloy under free fall condition

Xiang Rong Liu; Chong De Cao; Bing Bo Wei

doi:10.1088/1009-1963/12/11/315

Rapid eutectic growth in undercooled Al-Ge alloy under free fall condition

Xiang Rong Liu, Chong De Cao, Bing Bo Wei

School of Physical Science and Technology

Northwestern Polytechnical University Xian

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

14 Scopus citations

Abstract

Eutectic growth in Al-51.6%wt Ge alloy has been investigated during free fall in a drop tube. With decreasing undercooling ΔT, the microstructural evolution has shown a transition from lamellar eutectic to anomalous eutectic. A maximum cooling rate of 4.2 × 10⁴K/s and undercooling of up to 240K (0.35T_E) are obtained in the experiment. The eutectic coupled zone is calculated on the basis of current eutectic and dendritic growth theories, which covers a composition range from 48%-59% Ge and leans towards the Ge-rich side. The two critical undercoolings for the eutectic transition are ΔT*₁ =101K and ΔT*₂ = 178K. When ΔT ≤ ΔT*₁, the microstructure for Al-51.6% Ge eutectic shows lamellar eutectic. If ΔT ≥ ΔT*₂, the microstructure shows anomalous eutectic. In the intermediate range of ΔT*₁ < ΔT < ΔT*₂ the microstructure is the mixture of the above two types of eutectics.

Original language	English
Pages (from-to)	1266-1271
Number of pages	6
Journal	Chinese Physics
Volume	12
Issue number	11
DOIs	https://doi.org/10.1088/1009-1963/12/11/315
State	Published - 2003

Keywords

Coupled zone
Free fall
Growth
Morphology
Undercooling

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title = "Rapid eutectic growth in undercooled Al-Ge alloy under free fall condition",

abstract = "Eutectic growth in Al-51.6%wt Ge alloy has been investigated during free fall in a drop tube. With decreasing undercooling ΔT, the microstructural evolution has shown a transition from lamellar eutectic to anomalous eutectic. A maximum cooling rate of 4.2 × 104K/s and undercooling of up to 240K (0.35TE) are obtained in the experiment. The eutectic coupled zone is calculated on the basis of current eutectic and dendritic growth theories, which covers a composition range from 48%-59% Ge and leans towards the Ge-rich side. The two critical undercoolings for the eutectic transition are ΔT*1 =101K and ΔT*2 = 178K. When ΔT ≤ ΔT*1, the microstructure for Al-51.6% Ge eutectic shows lamellar eutectic. If ΔT ≥ ΔT*2, the microstructure shows anomalous eutectic. In the intermediate range of ΔT*1 < ΔT < ΔT*2 the microstructure is the mixture of the above two types of eutectics.",

keywords = "Coupled zone, Free fall, Growth, Morphology, Undercooling",

author = "Liu, {Xiang Rong} and Cao, {Chong De} and Wei, {Bing Bo}",

year = "2003",

doi = "10.1088/1009-1963/12/11/315",

language = "英语",

volume = "12",

pages = "1266--1271",

journal = "Chinese Physics",

issn = "1009-1963",

publisher = "IOP Publishing Ltd.",

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TY - JOUR

T1 - Rapid eutectic growth in undercooled Al-Ge alloy under free fall condition

AU - Liu, Xiang Rong

AU - Cao, Chong De

AU - Wei, Bing Bo

PY - 2003

Y1 - 2003

N2 - Eutectic growth in Al-51.6%wt Ge alloy has been investigated during free fall in a drop tube. With decreasing undercooling ΔT, the microstructural evolution has shown a transition from lamellar eutectic to anomalous eutectic. A maximum cooling rate of 4.2 × 104K/s and undercooling of up to 240K (0.35TE) are obtained in the experiment. The eutectic coupled zone is calculated on the basis of current eutectic and dendritic growth theories, which covers a composition range from 48%-59% Ge and leans towards the Ge-rich side. The two critical undercoolings for the eutectic transition are ΔT*1 =101K and ΔT*2 = 178K. When ΔT ≤ ΔT*1, the microstructure for Al-51.6% Ge eutectic shows lamellar eutectic. If ΔT ≥ ΔT*2, the microstructure shows anomalous eutectic. In the intermediate range of ΔT*1 < ΔT < ΔT*2 the microstructure is the mixture of the above two types of eutectics.

AB - Eutectic growth in Al-51.6%wt Ge alloy has been investigated during free fall in a drop tube. With decreasing undercooling ΔT, the microstructural evolution has shown a transition from lamellar eutectic to anomalous eutectic. A maximum cooling rate of 4.2 × 104K/s and undercooling of up to 240K (0.35TE) are obtained in the experiment. The eutectic coupled zone is calculated on the basis of current eutectic and dendritic growth theories, which covers a composition range from 48%-59% Ge and leans towards the Ge-rich side. The two critical undercoolings for the eutectic transition are ΔT*1 =101K and ΔT*2 = 178K. When ΔT ≤ ΔT*1, the microstructure for Al-51.6% Ge eutectic shows lamellar eutectic. If ΔT ≥ ΔT*2, the microstructure shows anomalous eutectic. In the intermediate range of ΔT*1 < ΔT < ΔT*2 the microstructure is the mixture of the above two types of eutectics.

KW - Coupled zone

KW - Free fall

KW - Growth

KW - Morphology

KW - Undercooling

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DO - 10.1088/1009-1963/12/11/315

M3 - 文章

AN - SCOPUS:23244449662

SN - 1009-1963

VL - 12

SP - 1266

EP - 1271

JO - Chinese Physics

JF - Chinese Physics

IS - 11

ER -

Rapid eutectic growth in undercooled Al-Ge alloy under free fall condition

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Keywords

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