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Indexed by:期刊论文

Date of Publication:2010-09-03

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:505

Issue:2

Page Number:505-509

ISSN No.:0925-8388

Key Words:Cu-Ni; Heat treatment; Cluster model; Corrosion

Abstract:Minor Fe additions are widely added to enhance the corrosion resistance of cupronickel alloys. The present paper aims at optimizing the amounts of Fe in Cu-70(Ni,Fe)(30) (at.%) alloys using a cluster-plus-glue-atom model for stable solid solutions. By this model, it is assumed that one Fe atom and 12 Ni atoms formed a Fe-centered and Ni-surrounded cube-octahedron cluster and the isolated FeNi12 clusters embedded in a Cu matrix. The stable solid solution alloy composition of Fe-modified Cu70Ni30 alloy was described by a cluster formula [Fe-1 Ni-12]Cu-30.3 = CU70Ni27.7Fe2.3 (at.%). The effect of homogenizing annealing treatment on the microstructure and corrosion resistance was also investigated by XRD, TEM and electrochemical corrosion measurements. The corrosion test indicates that the Cu70Ni27.7Fe2.3 alloy annealed at 800 degrees C for 5 h possesses the best corrosion resistance in 3.5% NaCI solution. (C) 2010 Elsevier B.V. All rights reserved.