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Fig.3 Surface of sample A (a), and sample D (b) after exposing to election beam test. zB. 1 
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Fig. 4 Cross sections of 3- layer Cu-W FGM after exposing to electron beam test (a). Instabilities of melted W 30-35 
layer (b), (c) Binden 
4.Conclusions weh 
It was shown that conductivity is strongly dependant on gradient structure, porosity and Die 
thickness of external W layer. Six layers Cu-W FGM have higher values of thermal conductivity af I 
due to better interfacial bond quality. The most critical erosion mechanism caused by electron beam Epoxid 
test is associated with instabilities in molten W layer. di 
Acknowledgement Gr 
The project is supported by the German Science Foundation in the program “Gradientenwerkstoffe” Iron: 
under contract Nr.Mu959/-5.We also thank to Dr Xu (Saarland University) for assistance in 
measurement of electrical resistivity, and to Dr Rodig (Research Center Jiilich) for electron beam x 
test. 
References 
[1]W.S. Wang, K.S. Hwang: Metallurgical and Materials Transactions 29A (1998), 1509 
[2]M. Takahashi, Y.Itoh, H. Kashiwaya: Proceedings of the First Symposium FGM( 1990), 129 
[3]L Smid, M. Akiba, G. Vieider, L.Plöchl: J.Nuclear Materials 258-263 (1998), 160 
[4] M. Takahashi, Y.Itoh,M.Miyazaki, H. Takano, T. Okuhata: Proceedings of the 13" International 
Plansee Seminar (1993), 17 
[5]J.L. Johnson, R.M. German: Metallurgical Transactions 29A (1993), 2369 
[6]U.Birth, M. Joensson, B. Kieback: Proceedings of the Fifth Symposium FGM( 1998), 766 
[7]R. Jedamzik, A. Neubrand, J. Rédel: J. Mater.Scie. 35 (2000), 477 
[8]M.M Gasik, S. Ueda: Proceedings of the Fifth Symposium FGM( 1998), 603 
[91] Linke, R. Duwe, A. Gervash, R.H. Qian, M. Rédig, A. Schuster: J Nuclear Materials 258-263 
(1998). 634. 
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