Interphase interfaces

In this chapter the structure and thermodynamics of the various interfaces which can form between different phases in sohd systems are described. Essentially, all tbe features described in Chapter 4 for single-phase systems apply, with added complexity being introduced by differences in crystal structure and/or composition of the adjoining phases. Particular emphasis is placed on the effects of surfaces and interfaces on chemical reactions involving thin films. 

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Fig. 7.5. Nucleation in solids. Heterogeneous nucleotion con take place at defects like dislocations, grain boundaries, interphase interfaces and free surfaces. Homogeneous nucleation, in defect-free regions, is rare.

Karpur. P., Matikas, T. E., and Krishnamurthy, S. (1995a). Ultrasonic characterization of the liber-matrix interphase interface for mechanics of continuous fiber reinforc-ed metal matrix and ceramic matrix composites. Compositex Engineering. 5. 6. 697 -711. 

An immiscible polymer mixture with a modified interphase, interface and morphology. 

In order to develop natural fiber-reinforced polymer composites, the primary focus should be given to the nature of the interface between the natural fiber and the polymer matrix. A fundamental understanding of fiber-fiber and fiber-matrix interface is critical to the design and manufacture of polymer composite materials because stress transfer between load-bearing fibers can occur at the fiber-fiber interface and fiber-matrix interface. In wood-polymer composite systems there are two interfaces that exist, one between the wood surface and the interphase and one between the polymer and interphase [1]. Therefore, failure in a composite or bonded laminate can occur as follows (i) adhesive failure in the wood-interphase interface, (ii) the interphase-polymer... 

Polymer of different prq ertie ) MatrIX interphase interface... 

A SEM micrograph of crack propagation, obtained in situ in an Al203-Al2Ti05 composite, is shown in Fig. 8.64. The advancing crack tip appears to be attracted to the alumina-aluminum titanate [henceforth A-AT] interphase interfaces. This observation implies that the high residual stress (and possibly the elastic modulus... 

In this chapter it has been shown that interphase interfaces in crystalline materials may be characterized by their structure as coherent, semico-herent or incoherent. The nature of the interface affects the morphology of second phases and the way they interact with grain boundaries. It has also been shown that the relative values of the surface and interfacial energies in a layered system can have a significant effect on the stability... 

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