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Title: Ordering of the fibrous eutectic microstructure of Al-Al{sub 3}Ni due to accelerated solidification conditions

Abstract

Directional solidification experiments with eutectic Al-Al{sub 3}Ni alloys were performed in which the solidification front was accelerated or decelerated continuously. The temperature gradient at the solid/liquid interface could be kept constant. At a fixed position in all samples processed, the absolute velocity was, however, the same, independent of the velocity with which the solidification started. The microstructure perpendicular to the growth direction was analyzed with respect to average fiber distances, number of nearest neighbors and the distribution of these quantities. An order parameter is defined to describe the deviation from a perfect hexagonal arrangement. Inasmuch as the acceleration changes from negative to positive values, the arrangement of the fibers comes closer to a perfect hexagonal lattice. The experimental observations are described and interpreted qualitatively.

Authors:
;
Publication Date:
Research Org.:
German Aerospace Research Center, Cologne (DE)
OSTI Identifier:
20075945
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; SOLIDIFICATION; ALUMINIUM ALLOYS; NICKEL ALLOYS; LIQUID METALS; INTERFACES; VELOCITY; ORDER PARAMETERS

Citation Formats

Ratke, L., and Alkemper, J. Ordering of the fibrous eutectic microstructure of Al-Al{sub 3}Ni due to accelerated solidification conditions. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00461-9.
Ratke, L., & Alkemper, J. Ordering of the fibrous eutectic microstructure of Al-Al{sub 3}Ni due to accelerated solidification conditions. United States. doi:10.1016/S1359-6454(99)00461-9.
Ratke, L., and Alkemper, J. Thu . "Ordering of the fibrous eutectic microstructure of Al-Al{sub 3}Ni due to accelerated solidification conditions". United States. doi:10.1016/S1359-6454(99)00461-9.
@article{osti_20075945,
title = {Ordering of the fibrous eutectic microstructure of Al-Al{sub 3}Ni due to accelerated solidification conditions},
author = {Ratke, L. and Alkemper, J.},
abstractNote = {Directional solidification experiments with eutectic Al-Al{sub 3}Ni alloys were performed in which the solidification front was accelerated or decelerated continuously. The temperature gradient at the solid/liquid interface could be kept constant. At a fixed position in all samples processed, the absolute velocity was, however, the same, independent of the velocity with which the solidification started. The microstructure perpendicular to the growth direction was analyzed with respect to average fiber distances, number of nearest neighbors and the distribution of these quantities. An order parameter is defined to describe the deviation from a perfect hexagonal arrangement. Inasmuch as the acceleration changes from negative to positive values, the arrangement of the fibers comes closer to a perfect hexagonal lattice. The experimental observations are described and interpreted qualitatively.},
doi = {10.1016/S1359-6454(99)00461-9},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}