Variant Selection in Fcc-to-Bcc Precipitation at Grain Boundaries in Ni-43Cr Alloy

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Abstract:

Variant selection of bcc-Cr at the grain boundaries in a supersaturated fcc matrix was studied using a Ni-43Cr alloy. The preferentially selected variant was examined as a function of the grain boundary misorientation, the tilt angle between the {111}fcc plane and the grain boundary plane, and the orientation relationships with respect to both of the adjacent matrix grains.

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Periodical:

Materials Science Forum (Volumes 475-479)

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305-308

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Online since:

January 2005

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1016/s1359-6454(02)00577-3

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[6] Y.Adachi and K.Tsuzaki: Proceedings of Second International Symposium of Ultrafine Grained Structures (ISUGS2003), IMEA, Geelong. (2003). Figure 4 All {111}fcc planes in matrix 1(M1) and matrix 2(M2). ● corresponds to the {111}fcc plane selected for the variant satisfying KS O.R. with respect to the adjacent matrix grains. Figure 5 Schematic representation of a change in ΔG*/ΔGs* as a function of θand orientation relationship. θ KS O.R θmin<θC θC ΔG * /ΔGs * Case2: KS-KS O.R. Case 1: KS O.R.,θmin>θC 14°°°° 7°°°° 0

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