We can define an interface between any two phases, say fiber and matrix, as a bounding surface where a discontinuity of some kind occurs. The discontinuity may be sharp or gradual. In general, the interface is an essentially bidimensional region through which material parameters, such as concentration of an element, crystal structure, atomic registry, elastic modulus, density, and coefficient of thermal expansion, change from one side to another. Clearly, a given interface may involve one or more of these items. Most of the physical, chemical, or mechanical discontinuities listed are self-explanatory. The concept of atomic registry perhaps needs some further elaboration. In terms of the atomic registry types, we can have a coherent, semicoherent, or incoherent interface. A coherent interfaces is one where atoms at the interface form part of both the crystal lattices; that is, there exists a one-to-one correspondence between atomic sites on the two sides of the interface. In general, a perfect atomic registry does not occur between unconstrained crystals. Rather, coherency at the interface invariably involves an elastic deformation of the crystals. A coherent interface, however, has a lower energy than an incoherent one. A classic example of coherent interface is the interface between G-P zones and the aluminum matrix.
KeywordsDepression Silane Tungsten Pyramid Wettability
Unable to display preview. Download preview PDF.
- 1.J.L. Walter, H.E. Cline, and E. Koch, Trans. AIME, 245, 2073 (1969).Google Scholar
- 7.C. Schoene and E. Scala, Met. Trans., 1, 3466 (1970).Google Scholar
- 8.R.G. Hill, R.P. Nelson, and C.L. Hellerich, in Proceedings of the 16th Refractory Working Group Meeting, Seattle, WA, October 1969.Google Scholar
- 9.K.K. Chawla and M. Metzger, in Advances in Research on Strength and Fracture of Materials, Vol. 3, Pergamon Press, New York, 1978, p. 1039.Google Scholar
- 11.A.G. Metcalfe, in Interfaces in Metal Matrix Composites, Academic Press, New York, 1974, p. 65.Google Scholar
- 12.E.P. Plueddemann, in Interfaces in Polymer Matrix Composites, Academic Press, New York, 1974, p. 174.Google Scholar
- 13.L.J. Broutman, in Interfaces in Composites, ASTM STP No. 452, American Society of Testing & Materials, Philadelphia, 1969.Google Scholar
- A.K. Dhingra and S.G. Fishman (eds.), Interfaces in Metal Matrix Composites, TMS-AIME, Warrendale, PA., 1986.Google Scholar
- A.G. Metcalfe (ed.), Interfaces in Metal Matrix Composites (vol. 1 of the series Composite Materials), Academic Press, New York, 1974.Google Scholar
- E.P. Plueddemann (ed.), Interfaces in Polymer Matrix Composites (vol. 6 of the series Composite Materials), Academic Press, New York, 1974.Google Scholar