Martensite wedge microstructures

Our intention in the remainder of this section is to build up a picture of some of the various interfaces that are present in martensitic systems. Our approach will be to consider microstructural elements of increasing complexity, beginning first with the case of the simple austenite-martensite interface and culminating in the investigation of martensitic wedges within the host austenite. In all of these cases, the primary theoretical engine in our analysis will be the compatibility conditions and their outcome as typified by eqns (10.62) and (10.63). 

From the standpoint of the kinematic arguments introduced earlier, the additional complexity that attends situations such as the wedge microstructure considered here is the fact that we no longer have only a single interface on which to satisfy the conditions of compatibility. Our calculations on the austenite-twiimed-martensite interface served as a warm up exercise for the present case. Each and every interface of the type in fig. 10.35 must itself satisfy conditions such as that of eqn (10.59). As a result, the imposition of compatibility across all of the interfaces takes the form of the collection of equations... 

Plate 4.2 Microstructure of a wedge-type diffusion couple in which the y-Nb4N . % formed martensitically from b-NbN, x- Anodically oxidized. 

Bhattacharya K., Theory of Martensitic Micro structure and the Shape-Memory Effect (unpublished) (1998) - available from author bhatta caltech.edu Bhattacharya K., Wedge-like Microstructure in Martensites, Acta Metall. Mater. 39, 2431 (1991). Binder K., Ordering of the Face-Centered-Cubic Lattice with Nearest-Neighbor Interaction, Phys. Rev. Lett., 45, 811 (1980). 

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See also in sourсe #XX -- [ ]

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