Microstructure evolution and formation mechanism of laser-ignited SHS joining between Cf/Al composites and TiAl alloys with Ni–Al–Ti interlayer

Microstructure evolution and formation mechanism of laser-ignited SHS joining between Cf/Al... In this study, Cf/Al composites and TiAl alloys were joined by a new method named laser-ignited self-propagating synthesis (SHS). Mixed powders of 63.0Ni–31.9Al–5.1Ti (wt%) were used as joining interlayer. Perfect joint was got. The microstructure evolution and formation mechanism of the SHS joint were investigated by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Results show that localized melting occurs on both sides. One γ-Ni0.35Al0.30Ti0.35 and two Ni–Al reaction layers form, respectively, in the TiAl/interlayer and Cf/Al/interlayer interfaces. The combustion of Ni–Al–Ti interlayer begins with the sharp reaction of Ni and Al. The interlayer product is a eutectic organization of NiAl and Al-rich γ. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Rare Metals Springer Journals

Microstructure evolution and formation mechanism of laser-ignited SHS joining between Cf/Al composites and TiAl alloys with Ni–Al–Ti interlayer

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Publisher
Nonferrous Metals Society of China
Copyright
Copyright © 2015 by The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg
Subject
Materials Science; Metallic Materials; Nanotechnology; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Inorganic Chemistry; Physical Chemistry
ISSN
1001-0521
eISSN
1867-7185
D.O.I.
10.1007/s12598-015-0542-1
Publisher site
See Article on Publisher Site

Abstract

In this study, Cf/Al composites and TiAl alloys were joined by a new method named laser-ignited self-propagating synthesis (SHS). Mixed powders of 63.0Ni–31.9Al–5.1Ti (wt%) were used as joining interlayer. Perfect joint was got. The microstructure evolution and formation mechanism of the SHS joint were investigated by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Results show that localized melting occurs on both sides. One γ-Ni0.35Al0.30Ti0.35 and two Ni–Al reaction layers form, respectively, in the TiAl/interlayer and Cf/Al/interlayer interfaces. The combustion of Ni–Al–Ti interlayer begins with the sharp reaction of Ni and Al. The interlayer product is a eutectic organization of NiAl and Al-rich γ.

Journal

Rare MetalsSpringer Journals

Published: Jun 30, 2015

References

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