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Article Dans Une Revue Metallurgical and Materials Transactions A Année : 2011

Microscale and Mesoscale Crystallographic Textures of Nanocrystalline Ni-Based Electrodeposits

Résumé

The microscale and mesoscale crystallographic textures observed in nanocrystalline Ni, Ni-20 pct Fe, and Ni-50 pct Fe electrodeposits are described. The nanosized grains are arranged in coarse mesoscale colonies. In the as-deposited state, the bulk texture of the Ni-20 pct Fe alloy displays a dominant aOE (c) 001 > fiber parallel to the macroscopic deposition direction (DD). The grains are elongated along the aOE (c) 001 > crystal lattice direction, which is mostly parallel to the local DD, producing a well-defined aOE (c) 001 >//DD fiber microtexture on a local scale. The grain misorientation histograms show some content of low-angle boundaries, frequently associated with the presence of grain clusters, and are dominated by high-angle boundaries with a possible enhanced frequency of a5 and a7 coincident site lattice boundaries and a significant content of a3 twin boundaries. For all three alloys, the coarsened grains, obtained by annealing, within the mesoscale colonies show a fiber mesotexture characterized by a aOE (c) 111 > axis approximately perpendicular to the colony hemispherical growth surface (parallel to the local DD). It is surmised that a similar "cobblestone" mesotexture with a aOE (c) 001 > fiber axis already exists in the as-received state, as previously proposed by a number of the present authors and as supported by the results on the Ni-20 pct Fe alloy presented here

Domaines

Matériaux

Dates et versions

hal-00640155 , version 1 (10-11-2011)

Identifiants

Citer

P. Cizek, M.R. Barnett, M.D. Nave, E.F. Rauch, R. Balasubramaniam. Microscale and Mesoscale Crystallographic Textures of Nanocrystalline Ni-Based Electrodeposits. Metallurgical and Materials Transactions A, 2011, 42A (7), pp.2048-2060. ⟨10.1007/s11661-010-0583-x⟩. ⟨hal-00640155⟩
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