The solidification behavior of 8090 Al-Li alloy

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Metallurgical Transactions, B (Process Metallurgy); (United States)

DOI:https://doi.org/10.1007/BF02663146· OSTI ID:6085146

Liu, Y L; Hu, Z Q; Zhang, Y; Shi, C X ^[1]

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1. Academia Sinica, Shenyang (China). Inst. of Metal Research

In this work, the solidification and segregation behaviors of 8090 Al-Li alloy have been investigated with differential thermal analysis (DTA) and the metallographic-electron microprobe method. The results show that 8090 Al-Li alloy has a much more complex solidification path than Al-Li binary alloy due to the addition of many alloying elements and the presence of impure elements. Solidification begins at about 635 C with the reaction of L [yields] [alpha]-Al + L[prime], and this reaction goes on to termination. The alloying element Cu and impure elements Fe and Si have a strong segregation tendency. During solidification, Cu segregates to the interdendrite and finally forms [alpha]-Al + T[sub 2] eutectic. As a result, the solidification temperature range is greatly extended. Iron and Si form the insoluble constituents Al[sub 7]Cu[sub 2]Fe, AlLiSi, etc., although their concentrations in the alloy are quite low. With the increase of Fe content, there is a eutectic reaction of [alpha]-Al/Al[sub 3]Fe at about 595 C. The formation of insoluble constituents is influenced by both concentrations of impure elements in the alloy and the cooling rate.

• OSTI ID: 6085146
• Journal Information: Metallurgical Transactions, B (Process Metallurgy); (United States), Journal Name: Metallurgical Transactions, B (Process Metallurgy); (United States) Vol. 24B:5; ISSN MTTBCR; ISSN 0360-2141
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CHEMICAL ANALYSIS
COPPER ADDITIONS
COPPER ALLOYS
DIFFERENTIAL THERMAL ANALYSIS
ELECTRON MICROPROBE ANALYSIS
IRON ADDITIONS
IRON ALLOYS
LITHIUM ALLOYS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
METALLOGRAPHY
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
PHASE TRANSFORMATIONS
SILICON ADDITIONS
SILICON ALLOYS
SOLIDIFICATION
THERMAL ANALYSIS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS