NDLI: TLP brazing of aluminum to steel using PVD-deposited interlayer

Content Provider	Springer Nature Link
Author	Tillmann, Wolfgang Wojarski, Lukas
Copyright Year	2014
Abstract	The demand for hybrid material concepts is steadily growing, and especially dissimilar joints between aluminum and steel are, due to their wide dissemination, of major importance. The main obstacle for the fabrication of aluminum-steel joints using thermal processes is the embrittlement of the fusion area. In order to prevent direct contact between aluminum and iron and thus to suppress the formation of brittle iron aluminides, 3-μm thick diffusion barrier coatings, consisting of Ni or Ti, were applied onto the steel surface. Pure copper with a thickness of 3 and 6 μm, respectively, was used as a filler material, and the samples were brazed in a TLP process in a vacuum at 580 °C at varying dwell times (10…50 min). The samples brazed with Ni diffusion barriers showed a considerable formation of Fe$_{2}$Al$_{5}$ even at low dwell times. Furthermore, additional complex ternary phase bands have generated due to the existence of diffusion barrier elements and were detected in the interfacial area. The application of Ti showed a significant decrease of iron aluminides, and no Fe$_{2}$Al$_{5}$ could be detected at low dwell times, resulting in a shear strength of 42 MPa for the optimized parameters.
Starting Page	673
Ending Page	680
Page Count	8
File Format	PDF
ISSN	00432288
Journal	Welding in the World
Volume Number	58
Issue Number	5
e-ISSN	18786669
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-05-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diffusion brazing Aluminum Brazing Metallic Materials Steels Microstructure Theoretical and Applied Mechanics Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Mechanical Engineering

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