The role of solute titanium and TiB2 particles in the liquid - Solid phase transformation of aluminum alloys

N. Iqbal; N. H. van Dijk; T. Hansen; L. Katgerman; G. J. Kearley

doi:10.1016/j.msea.2004.06.068

The role of solute titanium and TiB₂ particles in the liquid - Solid phase transformation of aluminum alloys

N. Iqbal, N. H. van Dijk, T. Hansen, L. Katgerman, G. J. Kearley

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

30 Citations (Scopus)

Abstract

The nucleation and growth kinetics of α-Al grains in the systems Al-0.1Ti and Al-0.15TiB 2 (wt.%) have been studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation under continuous cooling. The evolution of the static structure factor S(Q) was monitored for different cooling rates. The evolution of the solid fraction f_S for both samples during the transformation was determined from the normalized variation of the height of first peak in the liquid structure factor. The transformation kinetics was analyzed in terms of the Johnson-Mehl-Avrami model, and compared for both samples. The evolution of Bragg peaks emerging after the nucleation of the solid phase was monitored. The results reveal that the TiB₂ particles in pure aluminum are not effective nucleation sites for α-Al grains during solidification. However, the presence of solute titanium in the Al-0.1Ti alloy changes the growth rate of crystallization during solidification. In the early stages of the phase transformation in the Al-0.1Ti alloy, pronounced oscillations in the Bragg peaks intensity are observed. These observations are discussed in the light of the present grain refinement theories.

Original language	English
Pages (from-to)	20-26
Number of pages	7
Journal	Materials Science and Engineering A
Volume	386
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2004.06.068
Publication status	Published - 25 Nov 2004
Externally published	Yes

Funding

We gratefully acknowledge the technical assistance by Y.K. Huang from the University of Amsterdam for the preparation of the Al–1Ti master alloys. Thanks are due to the Institute Laue-Langevin for the beam time provided to perform the neutron diffraction experiments. 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

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.msea.2004.06.068

Cite this

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title = "The role of solute titanium and TiB2 particles in the liquid - Solid phase transformation of aluminum alloys",

abstract = "The nucleation and growth kinetics of α-Al grains in the systems Al-0.1Ti and Al-0.15TiB 2 (wt.\%) have been studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation under continuous cooling. The evolution of the static structure factor S(Q) was monitored for different cooling rates. The evolution of the solid fraction fS for both samples during the transformation was determined from the normalized variation of the height of first peak in the liquid structure factor. The transformation kinetics was analyzed in terms of the Johnson-Mehl-Avrami model, and compared for both samples. The evolution of Bragg peaks emerging after the nucleation of the solid phase was monitored. The results reveal that the TiB2 particles in pure aluminum are not effective nucleation sites for α-Al grains during solidification. However, the presence of solute titanium in the Al-0.1Ti alloy changes the growth rate of crystallization during solidification. In the early stages of the phase transformation in the Al-0.1Ti alloy, pronounced oscillations in the Bragg peaks intensity are observed. These observations are discussed in the light of the present grain refinement theories.",

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

author = "N. Iqbal and \{van Dijk\}, \{N. H.\} and T. Hansen and L. Katgerman and Kearley, \{G. J.\}",

year = "2004",

month = nov,

day = "25",

doi = "10.1016/j.msea.2004.06.068",

language = "English",

volume = "386",

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journal = "Materials Science and Engineering A",

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T1 - The role of solute titanium and TiB2 particles in the liquid - Solid phase transformation of aluminum alloys

AU - Iqbal, N.

AU - van Dijk, N. H.

AU - Hansen, T.

AU - Katgerman, L.

AU - Kearley, G. J.

PY - 2004/11/25

Y1 - 2004/11/25

N2 - The nucleation and growth kinetics of α-Al grains in the systems Al-0.1Ti and Al-0.15TiB 2 (wt.%) have been studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation under continuous cooling. The evolution of the static structure factor S(Q) was monitored for different cooling rates. The evolution of the solid fraction fS for both samples during the transformation was determined from the normalized variation of the height of first peak in the liquid structure factor. The transformation kinetics was analyzed in terms of the Johnson-Mehl-Avrami model, and compared for both samples. The evolution of Bragg peaks emerging after the nucleation of the solid phase was monitored. The results reveal that the TiB2 particles in pure aluminum are not effective nucleation sites for α-Al grains during solidification. However, the presence of solute titanium in the Al-0.1Ti alloy changes the growth rate of crystallization during solidification. In the early stages of the phase transformation in the Al-0.1Ti alloy, pronounced oscillations in the Bragg peaks intensity are observed. These observations are discussed in the light of the present grain refinement theories.

AB - The nucleation and growth kinetics of α-Al grains in the systems Al-0.1Ti and Al-0.15TiB 2 (wt.%) have been studied by time-resolved neutron diffraction measurements during the liquid-solid phase transformation under continuous cooling. The evolution of the static structure factor S(Q) was monitored for different cooling rates. The evolution of the solid fraction fS for both samples during the transformation was determined from the normalized variation of the height of first peak in the liquid structure factor. The transformation kinetics was analyzed in terms of the Johnson-Mehl-Avrami model, and compared for both samples. The evolution of Bragg peaks emerging after the nucleation of the solid phase was monitored. The results reveal that the TiB2 particles in pure aluminum are not effective nucleation sites for α-Al grains during solidification. However, the presence of solute titanium in the Al-0.1Ti alloy changes the growth rate of crystallization during solidification. In the early stages of the phase transformation in the Al-0.1Ti alloy, pronounced oscillations in the Bragg peaks intensity are observed. These observations are discussed in the light of the present grain refinement theories.

KW - Aluminum alloys

KW - Neutron diffraction

KW - Solidification

KW - Structure factor

KW - TiB

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