Microstructure development during pack aluminization of nickel and nickel-chromium wires

Dinc Erdeniz; David C. Dunand

doi:10.1016/j.intermet.2014.02.009

Microstructure development during pack aluminization of nickel and nickel-chromium wires

Dinc Erdeniz^*, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

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

25 Scopus citations

Abstract

Pack aluminization - a chemical vapor deposition process widely used to form protective coatings on Ni-based superalloy components - was used to form shells of Ni₂Al₃, NiAl and/or γ′-Ni ₃Al on the surface of γ-Ni wires with diameters of 127 μm. The growth kinetics of these Al-rich intermetallic shells are studied as a function of aluminization time and pack activity at 1000 C. Similar kinetics but additional phases (Cr/Ni two-phase shell, Cr silicide particles and Al-rich particles distributed in Ni₂Al₃) are found in the shells of pack-aluminized Ni-20 wt.% Cr wires with similar diameters. Fully homogenous Ni-Al and Ni-Cr-Al wires are achieved by interdiffusion at 1200 C between the deposited Al-rich intermetallic shells and the Ni-rich core of both types of wires. Upon subsequent aging at 900 C, wires with γ/γ′ structure and high hardness indicative of precipitation strengthening are obtained.

Original language	English (US)
Pages (from-to)	43-53
Number of pages	11
Journal	Intermetallics
Volume	50
DOIs	https://doi.org/10.1016/j.intermet.2014.02.009
State	Published - Jul 2014

Keywords

A. Intermetallics
B. Age-hardening
B. Diffusion
C. Coatings
D. Microstructure

ASJC Scopus subject areas

General Chemistry
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.intermet.2014.02.009

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title = "Microstructure development during pack aluminization of nickel and nickel-chromium wires",

abstract = "Pack aluminization - a chemical vapor deposition process widely used to form protective coatings on Ni-based superalloy components - was used to form shells of Ni2Al3, NiAl and/or γ′-Ni 3Al on the surface of γ-Ni wires with diameters of 127 μm. The growth kinetics of these Al-rich intermetallic shells are studied as a function of aluminization time and pack activity at 1000 C. Similar kinetics but additional phases (Cr/Ni two-phase shell, Cr silicide particles and Al-rich particles distributed in Ni2Al3) are found in the shells of pack-aluminized Ni-20 wt.% Cr wires with similar diameters. Fully homogenous Ni-Al and Ni-Cr-Al wires are achieved by interdiffusion at 1200 C between the deposited Al-rich intermetallic shells and the Ni-rich core of both types of wires. Upon subsequent aging at 900 C, wires with γ/γ′ structure and high hardness indicative of precipitation strengthening are obtained.",

keywords = "A. Intermetallics, B. Age-hardening, B. Diffusion, C. Coatings, D. Microstructure",

author = "Dinc Erdeniz and Dunand, {David C.}",

note = "Funding Information: The authors acknowledge the financial support from the Defense Advanced Research Projects Agency under award number W91CRB1010004 (Dr. Judah Goldwasser, program manager). They also thank Prof. Peter Voorhees and Dr. Thomas Philippe (both Northwestern University), as well as Prof. Kevin Hemker (Johns Hopkins University) for useful discussions, Mr. Edward Lee Pang for his help with metallographic sample preparation, and Ms. Ashley Paz y Puente for proof reading. ",

year = "2014",

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doi = "10.1016/j.intermet.2014.02.009",

language = "English (US)",

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T1 - Microstructure development during pack aluminization of nickel and nickel-chromium wires

AU - Erdeniz, Dinc

AU - Dunand, David C.

N1 - Funding Information: The authors acknowledge the financial support from the Defense Advanced Research Projects Agency under award number W91CRB1010004 (Dr. Judah Goldwasser, program manager). They also thank Prof. Peter Voorhees and Dr. Thomas Philippe (both Northwestern University), as well as Prof. Kevin Hemker (Johns Hopkins University) for useful discussions, Mr. Edward Lee Pang for his help with metallographic sample preparation, and Ms. Ashley Paz y Puente for proof reading.

PY - 2014/7

Y1 - 2014/7

N2 - Pack aluminization - a chemical vapor deposition process widely used to form protective coatings on Ni-based superalloy components - was used to form shells of Ni2Al3, NiAl and/or γ′-Ni 3Al on the surface of γ-Ni wires with diameters of 127 μm. The growth kinetics of these Al-rich intermetallic shells are studied as a function of aluminization time and pack activity at 1000 C. Similar kinetics but additional phases (Cr/Ni two-phase shell, Cr silicide particles and Al-rich particles distributed in Ni2Al3) are found in the shells of pack-aluminized Ni-20 wt.% Cr wires with similar diameters. Fully homogenous Ni-Al and Ni-Cr-Al wires are achieved by interdiffusion at 1200 C between the deposited Al-rich intermetallic shells and the Ni-rich core of both types of wires. Upon subsequent aging at 900 C, wires with γ/γ′ structure and high hardness indicative of precipitation strengthening are obtained.

AB - Pack aluminization - a chemical vapor deposition process widely used to form protective coatings on Ni-based superalloy components - was used to form shells of Ni2Al3, NiAl and/or γ′-Ni 3Al on the surface of γ-Ni wires with diameters of 127 μm. The growth kinetics of these Al-rich intermetallic shells are studied as a function of aluminization time and pack activity at 1000 C. Similar kinetics but additional phases (Cr/Ni two-phase shell, Cr silicide particles and Al-rich particles distributed in Ni2Al3) are found in the shells of pack-aluminized Ni-20 wt.% Cr wires with similar diameters. Fully homogenous Ni-Al and Ni-Cr-Al wires are achieved by interdiffusion at 1200 C between the deposited Al-rich intermetallic shells and the Ni-rich core of both types of wires. Upon subsequent aging at 900 C, wires with γ/γ′ structure and high hardness indicative of precipitation strengthening are obtained.

KW - A. Intermetallics

KW - B. Age-hardening

KW - B. Diffusion

KW - C. Coatings

KW - D. Microstructure

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SP - 43

EP - 53

JO - Intermetallics

JF - Intermetallics

ER -

Microstructure development during pack aluminization of nickel and nickel-chromium wires

Abstract

Keywords

ASJC Scopus subject areas

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