The structure and properties of magnetron sputtered Fe-Cr-Ni coatings containing sigma phase

Bertram Mallia; Karl L. Dahm; Abraham Ogwu; Peter A. Dearnley

doi:10.1002/ppap.200730501

The structure and properties of magnetron sputtered Fe-Cr-Ni coatings containing sigma phase

Bertram Mallia
, Karl L. Dahm
, Abraham Ogwu
, Peter A. Dearnley

Botswana International University of Science & Technology

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Fe-Cr-Ni alloy coatings were codeposited onto AISI 316L substrates using unbalanced magnetron sputtering. These were: (i) type B1, Fe-40Cr-4.5Ni; (ii) type B2, Fe-38Cr-8Ni; and (iii) type B3, Fe-55Cr-2.5Ni. In the as-deposited state, the B1 and B3 coatings mainly comprised solid solution α-Fe_(Cr) and α'-Cr_(Fe) phases, were fully dense, and had a microhardness of ∼700 kg ·mm^-2, while coating B2 entirely comprised FeCrNi σ-phase, contained micro- or nanometre-scale porosity, and had a hardness of ∼370 kg ·mm^-2. Despite being less hard, the as-deposited B2 coating displayed resistance to brittle fracture during scratch testing - this phenomenon was attributed to micropore toughening. When coating types B1 and B3 were partially or completely transformed to σ-phase (by vacuum heat treatment) brittle fracture took place during scratch testing.

Original language	English
Pages (from-to)	S113-S119
Number of pages	7
Journal	Plasma Processes and Polymers
Volume	4
Issue number	S1
DOIs	https://doi.org/10.1002/ppap.200730501
Publication status	Published - 2007

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Polymers and Plastics

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10.1002/ppap.200730501

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title = "The structure and properties of magnetron sputtered Fe-Cr-Ni coatings containing sigma phase",

abstract = "Fe-Cr-Ni alloy coatings were codeposited onto AISI 316L substrates using unbalanced magnetron sputtering. These were: (i) type B1, Fe-40Cr-4.5Ni; (ii) type B2, Fe-38Cr-8Ni; and (iii) type B3, Fe-55Cr-2.5Ni. In the as-deposited state, the B1 and B3 coatings mainly comprised solid solution α-Fe(Cr) and α'-Cr(Fe) phases, were fully dense, and had a microhardness of ∼700 kg ·mm-2, while coating B2 entirely comprised FeCrNi σ-phase, contained micro- or nanometre-scale porosity, and had a hardness of ∼370 kg ·mm-2. Despite being less hard, the as-deposited B2 coating displayed resistance to brittle fracture during scratch testing - this phenomenon was attributed to micropore toughening. When coating types B1 and B3 were partially or completely transformed to σ-phase (by vacuum heat treatment) brittle fracture took place during scratch testing.",

author = "Bertram Mallia and Dahm, \{Karl L.\} and Abraham Ogwu and Dearnley, \{Peter A.\}",

year = "2007",

doi = "10.1002/ppap.200730501",

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journal = "Plasma Processes and Polymers",

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TY - JOUR

T1 - The structure and properties of magnetron sputtered Fe-Cr-Ni coatings containing sigma phase

AU - Mallia, Bertram

AU - Dahm, Karl L.

AU - Ogwu, Abraham

AU - Dearnley, Peter A.

PY - 2007

Y1 - 2007

N2 - Fe-Cr-Ni alloy coatings were codeposited onto AISI 316L substrates using unbalanced magnetron sputtering. These were: (i) type B1, Fe-40Cr-4.5Ni; (ii) type B2, Fe-38Cr-8Ni; and (iii) type B3, Fe-55Cr-2.5Ni. In the as-deposited state, the B1 and B3 coatings mainly comprised solid solution α-Fe(Cr) and α'-Cr(Fe) phases, were fully dense, and had a microhardness of ∼700 kg ·mm-2, while coating B2 entirely comprised FeCrNi σ-phase, contained micro- or nanometre-scale porosity, and had a hardness of ∼370 kg ·mm-2. Despite being less hard, the as-deposited B2 coating displayed resistance to brittle fracture during scratch testing - this phenomenon was attributed to micropore toughening. When coating types B1 and B3 were partially or completely transformed to σ-phase (by vacuum heat treatment) brittle fracture took place during scratch testing.

AB - Fe-Cr-Ni alloy coatings were codeposited onto AISI 316L substrates using unbalanced magnetron sputtering. These were: (i) type B1, Fe-40Cr-4.5Ni; (ii) type B2, Fe-38Cr-8Ni; and (iii) type B3, Fe-55Cr-2.5Ni. In the as-deposited state, the B1 and B3 coatings mainly comprised solid solution α-Fe(Cr) and α'-Cr(Fe) phases, were fully dense, and had a microhardness of ∼700 kg ·mm-2, while coating B2 entirely comprised FeCrNi σ-phase, contained micro- or nanometre-scale porosity, and had a hardness of ∼370 kg ·mm-2. Despite being less hard, the as-deposited B2 coating displayed resistance to brittle fracture during scratch testing - this phenomenon was attributed to micropore toughening. When coating types B1 and B3 were partially or completely transformed to σ-phase (by vacuum heat treatment) brittle fracture took place during scratch testing.

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SN - 1612-8850

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JO - Plasma Processes and Polymers

JF - Plasma Processes and Polymers

IS - S1

ER -

The structure and properties of magnetron sputtered Fe-Cr-Ni coatings containing sigma phase

Abstract

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