Microstructural and Phase Composition Differences Across the Interfaces in Al/Ti/Al Explosively Welded Clads

The microstructure and phase composition of Al/Ti/Al interfaces with respect to their localization were investigated. An aluminum-flyer plate exhibited finer grains located close to the upper interface than those present within the aluminum-base plate. The same tendency, but with a higher number of...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-09, Vol.48 (9), p.4154-4165
Main Authors: Fronczek, Dagmara Malgorzata, Chulist, Robert, Litynska-Dobrzynska, Lidia, Lopez, Gabriel Alejandro, Wierzbicka-Miernik, Anna, Schell, Norbert, Szulc, Zygmunt, Wojewoda-Budka, Joanna
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crystal structure
Explosive welding
Grains
Intermetallic compounds
Intermetallic phases
Materials Science
Metallic Materials
Metallurgy
Microstructure
Nanotechnology
Phase composition
Phase transitions
Structural Materials
Surfaces and Interfaces
Thin Films
Titanium aluminides
Titanium compounds
Transmission electron microscopy
Welding
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Summary:The microstructure and phase composition of Al/Ti/Al interfaces with respect to their localization were investigated. An aluminum-flyer plate exhibited finer grains located close to the upper interface than those present within the aluminum-base plate. The same tendency, but with a higher number of twins, was observed for titanium. Good quality bonding with a wavy shape and four intermetallic phases, namely, TiAl 3 , TiAl, TiAl 2 , and Ti 3 Al, was only obtained at the interface closer to the explosive material. The other interface was planar with three intermetallic compounds, excluding the metastable TiAl 2 phase. As a result of a 100-hour annealing at 903 K (630 °C), an Al/TiAl 3 /Ti/TiAl 3 /Al sandwich was manufactured, formed with single crystalline Al layers. A substantial difference between the intermetallic layer thicknesses was measured, with 235.3 and 167.4  µ m obtained for the layers corresponding to the upper and lower interfaces, respectively. An examination by transmission electron microscopy of a thin foil taken from the interface area after a 1-hour annealing at 825 K (552 °C) showed a mixture of randomly located TiAl 3 grains within the aluminum. Finally, the hardness results were correlated with the microstructural changes across the samples.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-017-4169-8