Transient liquid phase (TLP) bonding of TiAl using various insert foils

Abstract

TiAl intermetallic alloys have been joined using the diffusion brazing technique with Ti insert foil metal combined with Cu, Ni or Fe foils. Defect-free joints can be fabricated successfully, no matter which kind of foil combination is used as insert metal. The interface structures of the joints were also investigated and results showed various interface structures in the joined zones. A mechanism for the development of the interface structure is proposed. It is suggested that the formation process of the liquid phase was responsible for the resulting interface structures. Post-bond heat treatment (PBHT) had no obvious effect on the interface structure of the joints because of the low diffusion coefficient of Cu, Ni and Fe in the parent material. Microhardness results showed a slight decrease in the joint area as a result of PBHT.

Keywords

DIFFUSION BRAZING INTERMETALLICS INTERFACE STRUCTURE

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References

Siren

, Bohm

K.-H.

, Appel

and Koçak

: Proc. Welding Conf. LUT Join ’99: Int. Conf. on Efficient Welding in Industrial Applications (ICEWIA), Lappeenranta, August 1999, p. 12.

Çam

and Koçak

: J. Mater. Sci., 1999, 34, 3345–3354.

Çam

, Clemens

, Gerling

and Koçak

: Z. Metallkd., 1999, 90, 284–288.

Madhusudhan Reddy

, Mohandas

and Chandreshekar

: Sci. Technol. Weld. Joining, 2001, 6, 300–304.

Kim

J. J.

, Park

J.-W.

and Eagar

T. W.

: Mater. Sci. Eng. A, 2003, 344, 240–244.

Assadi

, Shirzadi

A. A.

and Wallach

E. R.

: Acta Mater., 2001, 49, 31–39.

Macdonald

W. D.

and Eagar

T. W.

: ‘Transient liquid phase bonding processes, the metal science of joining’, (ed. M. J. Cieslak, J. H. Perepezko, S. Kand and M. E. Glicksman), 93–100; 1992, The Minerals, Metals & Materials Society.

Zhang

J. X.

, Chandel

R. S.

, Chen

Y. Z.

and Seow

H. P.

: J. Mater. Process. Technol., 2002, 122, 220–225.

Orel

S. V.

, Parous

L. C.

and Gale

W. F.

: Weld. J., 1995, 74, 319s–324s.

10.

Gale

W. F.

and Orel

S. V.

: J. Mater. Sci., 1996, 31, 345–349.

11.

Gale

W. F.

and Guan

: Metall. Mater. Trans. A, 1996, 27A, 3621–3629.

12.

Moore

T. J.

and Kalinowski

J. M.

: Mater. Res. Soc. Symp. Proc., 1993, 288, 1173–1178.

13.

Strum

M. J.

and Henshall

G. A.

: in ‘Advanced joining technologies for new materials II NiAl’, (ed. N. F. Flore and J. O. Stiegler), 76–88; 1994, Miami, FL, AWS.

14.

Butts

D. A.

, Gale

W. F.

and Zhou

: 6th Int. Trends in Welding Research Conference Proceedings, April 2002, Pine Mountain, GA, ASM International, 2003, pp. 495–499.

15.

Fergus

J. W.

, Zhou

, Dang

and Gale

W. F.

: 6th Int. Trends in Welding Research Conference Proceedings, April 2002, Pine Mountain, GA, ASM International, 2003, pp. 799–803.

16.

Hansen

P. M.

: ‘Constitution of binary alloy’, Metallurgy and Metallurgical Engineering Series; 1958, New York, McGraw- Hill Book Co. Inc.