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2008-01-29

2008-01-29

McNeil, Jennifer C. (Department: 1775)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having composition, density, or hardness gradient

C428S615000, C428S650000, C428S668000, C384S625000, C384S627000

Reexamination Certificate

active

07323254

ABSTRACT:
The invention relates to an alloy consisting of at least three components A, B, C, which form at least a first matrix and a soft phase dispersed therein, with a first surface (5) and a second surface (9) lying opposite it, the proportions of components A, B, C in the alloy being different from one another in the regions of the first (5) and the second surface (8). At least one of the components forms a hard phase and at least one of the other components forms another matrix different from the first matrix, the first matrix being disposed at least in the region of the first surface (5) and the other matrix being disposed at least in the region of the second surface (8), whilst the hard phase is dispersed through both the first and the other matrix.

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Zimmerman et al,Metallurgie und Werkstofftechnik, publ. by VEB Deutscher Verlag fuer Grundstoffindustrie, pp. 293 and 352.

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