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Title: Eutectic channelling in a squeeze cast Al-4.5Wt%Cu alloy

Abstract

The purpose of this study was to investigate to what extent macrosegregation occurs during the squeeze casting of a simple cylindrical shape in an Al-4.5wt%Cu alloy. The application of 100 MPa pressure during solidification caused a sharp increase in the cooling rate, to an average value of about 14 Ks{sup {minus}1}. At this cooling rate the liquidus temperature was resolvable, however it was difficult to observe the eutective thermal arrest. The macrostructure was characterized by a V-shaped pattern that extended over a large fraction of the ingot cross-section. The V-shaped segregates were regions which consisted of a mixture of the {alpha}-Al phase, the {alpha}-Al + {theta}-Al{sub 2}Cu eutectic and pro-eutectic {theta}-Al{sub 2}Cu particles. The exact cause of the formation of the eutectic channels in squeeze cast alloys is unclear. A previous explanation was that the V-shaped channels in squeeze castings are produced along the liquid metal feeding path. However, as the segregated channels are very large, these regions should be relatively easily fed during solidification. Also, as the solidification process occurs under near hydrostatic pressure, it is unclear where the driving force for the filling of these channels could come from. A simpler explanation may be that the macrosegregation ismore » an effect of the different thermal conditions during solidification that exist between gravity and squeeze casting.« less

Authors:
; ;  [1]
  1. Univ. of Oxford (United Kingdom)
Publication Date:
OSTI Identifier:
69646
Resource Type:
Journal Article
Journal Name:
Scripta Metallurgica et Materialia
Additional Journal Information:
Journal Volume: 32; Journal Issue: 10; Other Information: PBD: 15 May 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; CASTING; MICROSTRUCTURE; COPPER ALLOYS; SAMPLE PREPARATION; INTERMETALLIC COMPOUNDS; LIQUID METALS; PRESSING; VERY HIGH PRESSURE; SEGREGATION; METALLOGRAPHY; DENDRITES

Citation Formats

Gallerneault, M, Durrant, G, and Cantor, B. Eutectic channelling in a squeeze cast Al-4.5Wt%Cu alloy. United States: N. p., 1995. Web. doi:10.1016/0956-716X(94)00030-L.
Gallerneault, M, Durrant, G, & Cantor, B. Eutectic channelling in a squeeze cast Al-4.5Wt%Cu alloy. United States. https://doi.org/10.1016/0956-716X(94)00030-L
Gallerneault, M, Durrant, G, and Cantor, B. 1995. "Eutectic channelling in a squeeze cast Al-4.5Wt%Cu alloy". United States. https://doi.org/10.1016/0956-716X(94)00030-L.
@article{osti_69646,
title = {Eutectic channelling in a squeeze cast Al-4.5Wt%Cu alloy},
author = {Gallerneault, M and Durrant, G and Cantor, B},
abstractNote = {The purpose of this study was to investigate to what extent macrosegregation occurs during the squeeze casting of a simple cylindrical shape in an Al-4.5wt%Cu alloy. The application of 100 MPa pressure during solidification caused a sharp increase in the cooling rate, to an average value of about 14 Ks{sup {minus}1}. At this cooling rate the liquidus temperature was resolvable, however it was difficult to observe the eutective thermal arrest. The macrostructure was characterized by a V-shaped pattern that extended over a large fraction of the ingot cross-section. The V-shaped segregates were regions which consisted of a mixture of the {alpha}-Al phase, the {alpha}-Al + {theta}-Al{sub 2}Cu eutectic and pro-eutectic {theta}-Al{sub 2}Cu particles. The exact cause of the formation of the eutectic channels in squeeze cast alloys is unclear. A previous explanation was that the V-shaped channels in squeeze castings are produced along the liquid metal feeding path. However, as the segregated channels are very large, these regions should be relatively easily fed during solidification. Also, as the solidification process occurs under near hydrostatic pressure, it is unclear where the driving force for the filling of these channels could come from. A simpler explanation may be that the macrosegregation is an effect of the different thermal conditions during solidification that exist between gravity and squeeze casting.},
doi = {10.1016/0956-716X(94)00030-L},
url = {https://www.osti.gov/biblio/69646}, journal = {Scripta Metallurgica et Materialia},
number = 10,
volume = 32,
place = {United States},
year = {Mon May 15 00:00:00 EDT 1995},
month = {Mon May 15 00:00:00 EDT 1995}
}