Experimental study of ordering kinetics in aluminum alloys during solidification

N. Iqbal; N. H. Van Dijk; V. W.J. Verhoeven; W. Montfrooij; T. Hansen; L. Katgerman; G. J. Kearley

doi:10.1016/S1359-6454(03)00285-4

Experimental study of ordering kinetics in aluminum alloys during solidification

N. Iqbal, N. H. Van Dijk, V. W.J. Verhoeven, W. Montfrooij, T. Hansen, L. Katgerman, G. J. Kearley

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

24 Citations (Scopus)

Abstract

The microscopic structure and crystallization behavior of liquid Al and Al-0.3Ti-0.02B (wt.%) are studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation for continuous cooling. A specially developed furnace insert was used to obtain a temperature stability of 40 mK in the vicinity of the solidification temperature of T_o=933 K. The evolution of the static structure factor S(Q) has been monitored during the liquid to solid phase transformation as a function of the cooling rate. The evolution of the liquid fraction f_L during the transformation is determined from the value of the first peak in the liquid structure factor. The evolution of the solid volume fraction f_S=1-f_L is analyzed in terms of the Johnson-Mehl-Avrami model. The Avrami exponent n is found to change for pure Al as well as for Al-0.3Ti-0.02B alloy with cooling rate and the rate constant k decreases by an order of magnitude for Al-0.3Ti-0.02B alloy compared to pure Al. Anomalous temporal oscillations were observed in the Bragg peak intensity of the solid grains during the solidification of the Al-0.3Ti-0.02B alloy.

Original language	English
Pages (from-to)	4497-4504
Number of pages	8
Journal	Acta Materialia
Volume	51
Issue number	15
DOIs	https://doi.org/10.1016/S1359-6454(03)00285-4
Publication status	Published - 3 Sept 2003
Externally published	Yes

Funding

We thank R. Delaplane and R. McGreevy for their assistance during the preliminary measurements at the Studsvik Neutron Research Laboratory. The Institute Laue-Langevin is gratefully acknowledged for the beam time to perform these neutron diffraction experiments. We thank P. van der Ende for the design of the furnace insert. This work was financed in part by the Netherlands Foundation for Fundamental Research of Matter (FOM) and the Netherlands Institute for Metals Research (NIMR).

Keywords

Aluminum alloys
Neutron diffraction
Solidification
Structure factor
TiB

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/S1359-6454(03)00285-4

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title = "Experimental study of ordering kinetics in aluminum alloys during solidification",

abstract = "The microscopic structure and crystallization behavior of liquid Al and Al-0.3Ti-0.02B (wt.\%) are studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation for continuous cooling. A specially developed furnace insert was used to obtain a temperature stability of 40 mK in the vicinity of the solidification temperature of To=933 K. The evolution of the static structure factor S(Q) has been monitored during the liquid to solid phase transformation as a function of the cooling rate. The evolution of the liquid fraction fL during the transformation is determined from the value of the first peak in the liquid structure factor. The evolution of the solid volume fraction fS=1-fL is analyzed in terms of the Johnson-Mehl-Avrami model. The Avrami exponent n is found to change for pure Al as well as for Al-0.3Ti-0.02B alloy with cooling rate and the rate constant k decreases by an order of magnitude for Al-0.3Ti-0.02B alloy compared to pure Al. Anomalous temporal oscillations were observed in the Bragg peak intensity of the solid grains during the solidification of the Al-0.3Ti-0.02B alloy.",

keywords = "Aluminum alloys, Neutron diffraction, Solidification, Structure factor, TiB",

author = "N. Iqbal and \{Van Dijk\}, \{N. H.\} and Verhoeven, \{V. W.J.\} and W. Montfrooij and T. Hansen and L. Katgerman and Kearley, \{G. J.\}",

year = "2003",

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doi = "10.1016/S1359-6454(03)00285-4",

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T1 - Experimental study of ordering kinetics in aluminum alloys during solidification

AU - Iqbal, N.

AU - Van Dijk, N. H.

AU - Verhoeven, V. W.J.

AU - Montfrooij, W.

AU - Hansen, T.

AU - Katgerman, L.

AU - Kearley, G. J.

PY - 2003/9/3

Y1 - 2003/9/3

N2 - The microscopic structure and crystallization behavior of liquid Al and Al-0.3Ti-0.02B (wt.%) are studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation for continuous cooling. A specially developed furnace insert was used to obtain a temperature stability of 40 mK in the vicinity of the solidification temperature of To=933 K. The evolution of the static structure factor S(Q) has been monitored during the liquid to solid phase transformation as a function of the cooling rate. The evolution of the liquid fraction fL during the transformation is determined from the value of the first peak in the liquid structure factor. The evolution of the solid volume fraction fS=1-fL is analyzed in terms of the Johnson-Mehl-Avrami model. The Avrami exponent n is found to change for pure Al as well as for Al-0.3Ti-0.02B alloy with cooling rate and the rate constant k decreases by an order of magnitude for Al-0.3Ti-0.02B alloy compared to pure Al. Anomalous temporal oscillations were observed in the Bragg peak intensity of the solid grains during the solidification of the Al-0.3Ti-0.02B alloy.

AB - The microscopic structure and crystallization behavior of liquid Al and Al-0.3Ti-0.02B (wt.%) are studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation for continuous cooling. A specially developed furnace insert was used to obtain a temperature stability of 40 mK in the vicinity of the solidification temperature of To=933 K. The evolution of the static structure factor S(Q) has been monitored during the liquid to solid phase transformation as a function of the cooling rate. The evolution of the liquid fraction fL during the transformation is determined from the value of the first peak in the liquid structure factor. The evolution of the solid volume fraction fS=1-fL is analyzed in terms of the Johnson-Mehl-Avrami model. The Avrami exponent n is found to change for pure Al as well as for Al-0.3Ti-0.02B alloy with cooling rate and the rate constant k decreases by an order of magnitude for Al-0.3Ti-0.02B alloy compared to pure Al. Anomalous temporal oscillations were observed in the Bragg peak intensity of the solid grains during the solidification of the Al-0.3Ti-0.02B alloy.

KW - Aluminum alloys

KW - Neutron diffraction

KW - Solidification

KW - Structure factor

KW - TiB

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M3 - Article

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EP - 4504

JO - Acta Materialia

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IS - 15

ER -

Experimental study of ordering kinetics in aluminum alloys during solidification

Abstract

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ASJC Scopus subject areas

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