21.Electronic Materials by John G. Webster (Editor)

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Figure 18. Fracture surface of the AISI 4130/Incoloy 825 couple for which debonding takes place before final fracture (71). 336 BIMETALS (a) (b) Figure 19. Fracture surfaces of: (a) the AISI 4130 Steel and (b) the Ti alloy, in a region close to the bonding interface where the use of interlayers avoids debonding before final fracture in an AISI 4130/Ti 64 alloy couple (80). stresses are higher, the higher the proof stress of the steel. These predictions agree with results found experimentally. FRACTOGRAPHY Detailed analysis of the fracture of the bimetallic material in tension has shown that a local separation between the two materials occurs before fracture, when a weak region is produced at or close to the interface during bonding because of pores (93), intermetallics (80,94), and carbides (88).

C. ), Philadelphia: American Society for Testing and Materials, 1986, pp. 85–98. 73. P. , Mem. et Etudes Scientifiques de la Rev. de Metallurgie, 89, 27–37, 1992. 74. S. B. Dunkerton, Welding Inst. Res. , 23, 388–395, 1982. 75. A. Wisbey, C. M. Ward-Close, and I. C. Wallis, Mater. Sci. , A208: 93–100, 1996. 76. R. Lison, Le Soudage dans le Monde, 23 (5/6): 125–129, 1985. 77. K. , 217, 67–74, 1994. 78. M. Huet, M. Hourcade, and B. Hocheid, Mem. et Etudes Scientifiques Rev. de Metallurgie, 6: 313–325, 1988.

Thus at very high temperatures some insulators become semiconducting, while at low temperatures some semiconductors become insulators. Electronic Band Model CONDUCTING MATERIALS This article will present briefly principles of electrical conduction followed by a discussion of electron- and ion-conducting materials. Apart from well-known metals and alloys for electrical wires, cables, and contacts, several new classes of synthetic organic, inorganic, and composite conductors (1,2) have become available.

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