The evolution of texture during annealing of electroless Ni-Co-P deposits

The electroless Ni-Co-P alloy films containing up to 13.4% Co and 7.6% P were deposited on a 5086 aluminum alloy sheet using baths consisting of NiSO sub 4 , CoSO sub 4 , (NH sub 4 ) sub 2 SO sub 4 , NaH sub 2 PO sub 2 , sodium citrate and thiourea. The deposits were solid solutions having a grain s...

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Bibliographic Details
Published in:Scripta materialia 1999-05, Vol.40 (12), p.1333-1339
Main Authors: Lee, Dong Nyung, Hur, Kang-Heon
Format: Article
Language:English
Subjects:
ANNEALING
COBALT ALLOYS
Cross-disciplinary physics: materials science
rheology
Electrodeposition, electroplating
Electroless plating
Exact sciences and technology
MATERIALS SCIENCE
Methods of deposition of films and coatings
film growth and epitaxy
NICKEL ALLOYS
Nickel-cobalt-phosphorous alloys
PHASE TRANSFORMATIONS
PHOSPHORUS ADDITIONS
Physics
PLATING
TEXTURE
Texture transformation
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
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Description
Summary:The electroless Ni-Co-P alloy films containing up to 13.4% Co and 7.6% P were deposited on a 5086 aluminum alloy sheet using baths consisting of NiSO sub 4 , CoSO sub 4 , (NH sub 4 ) sub 2 SO sub 4 , NaH sub 2 PO sub 2 , sodium citrate and thiourea. The deposits were solid solutions having a grain sizes of 6-7 nm and strong < 111 > texture. When the deposits were annealed for 2 h, Ni sub 5 P sub 2 was precipitated at 325 deg C and transformed into the stable Ni sub 3 P phase at higher temperatures. During annealing the texture of deposit changed from < 111 > to < 100 > . The texture change was attributed to preferential growth of < 100 > grains at the expense of < 111 > grains to decrease the thermal strain energy of the deposits.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(99)00105-0