Nickel-aluminum diffusion: A study of evolution of microstructure and phase

Hossein Alimadadi; Cecilía Kristín Kjartansdóttir; Andrew Burrows; Takeshi Kasama; Per Møller

doi:10.1016/j.matchar.2017.05.039

Nickel-aluminum diffusion: A study of evolution of microstructure and phase

Hossein Alimadadi
, Cecilía Kristín Kjartansdóttir
, Andrew Burrows
, Takeshi Kasama
, Per Møller

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Microstructural and phase evolution of an aluminum deposit on nickel, after heat treatment at 883 K, is studied by means of various microscopy techniques, i.e. energy dispersive X-ray spectroscopy, backscattered electron imaging, electron backscatter diffraction, ion channeling contrast imaging and scanning transmission electron microscopy. AlNi₃ crystallites are observed on the aluminum grain boundaries after only 3 min of heat treatment indicating that nickel and nickel rich phases are the initially diffusing and forming species. Heat treatment for 120 min or longer results in the formation of Al₃Ni₂ and a porous Al₃Ni₂/γ-Al₂O₃ structure at the surface. The Al₃Ni₂ layer is composed of two different grain morphologies, indicating the position of a Kirkendall plane, and hence, there is a high diffusion rate of aluminum in this phase.

Original language	English
Journal	Materials Characterization
Volume	130
Pages (from-to)	105-112
ISSN	1044-5803
DOIs	https://doi.org/10.1016/j.matchar.2017.05.039
Publication status	Published - 2017

Keywords

Aluminum-nickel binary alloys
Diffusion
Electron microscopy
Grain boundary diffusion
Intermetallics
Kirkendall effect

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10.1016/j.matchar.2017.05.039

Title pageAccepted author manuscript, 15.3 KBLicence: CC BY-NC-ND
Full textAccepted author manuscript, 149 KBLicence: CC BY-NC-ND

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title = "Nickel-aluminum diffusion: A study of evolution of microstructure and phase",

abstract = "Microstructural and phase evolution of an aluminum deposit on nickel, after heat treatment at 883 K, is studied by means of various microscopy techniques, i.e. energy dispersive X-ray spectroscopy, backscattered electron imaging, electron backscatter diffraction, ion channeling contrast imaging and scanning transmission electron microscopy. AlNi3 crystallites are observed on the aluminum grain boundaries after only 3 min of heat treatment indicating that nickel and nickel rich phases are the initially diffusing and forming species. Heat treatment for 120 min or longer results in the formation of Al3Ni2 and a porous Al3Ni2/γ-Al2O3 structure at the surface. The Al3Ni2 layer is composed of two different grain morphologies, indicating the position of a Kirkendall plane, and hence, there is a high diffusion rate of aluminum in this phase.",

keywords = "Aluminum-nickel binary alloys, Diffusion, Electron microscopy, Grain boundary diffusion, Intermetallics, Kirkendall effect",

author = "Hossein Alimadadi and Kjartansd{\'o}ttir, \{Cecil{\'i}a Krist{\'i}n\} and Andrew Burrows and Takeshi Kasama and Per M{\o}ller",

year = "2017",

doi = "10.1016/j.matchar.2017.05.039",

language = "English",

volume = "130",

pages = "105--112",

journal = "Materials Characterization",

issn = "1044-5803",

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TY - JOUR

T1 - Nickel-aluminum diffusion: A study of evolution of microstructure and phase

AU - Alimadadi, Hossein

AU - Kjartansdóttir, Cecilía Kristín

AU - Burrows, Andrew

AU - Kasama, Takeshi

AU - Møller, Per

PY - 2017

Y1 - 2017

N2 - Microstructural and phase evolution of an aluminum deposit on nickel, after heat treatment at 883 K, is studied by means of various microscopy techniques, i.e. energy dispersive X-ray spectroscopy, backscattered electron imaging, electron backscatter diffraction, ion channeling contrast imaging and scanning transmission electron microscopy. AlNi3 crystallites are observed on the aluminum grain boundaries after only 3 min of heat treatment indicating that nickel and nickel rich phases are the initially diffusing and forming species. Heat treatment for 120 min or longer results in the formation of Al3Ni2 and a porous Al3Ni2/γ-Al2O3 structure at the surface. The Al3Ni2 layer is composed of two different grain morphologies, indicating the position of a Kirkendall plane, and hence, there is a high diffusion rate of aluminum in this phase.

AB - Microstructural and phase evolution of an aluminum deposit on nickel, after heat treatment at 883 K, is studied by means of various microscopy techniques, i.e. energy dispersive X-ray spectroscopy, backscattered electron imaging, electron backscatter diffraction, ion channeling contrast imaging and scanning transmission electron microscopy. AlNi3 crystallites are observed on the aluminum grain boundaries after only 3 min of heat treatment indicating that nickel and nickel rich phases are the initially diffusing and forming species. Heat treatment for 120 min or longer results in the formation of Al3Ni2 and a porous Al3Ni2/γ-Al2O3 structure at the surface. The Al3Ni2 layer is composed of two different grain morphologies, indicating the position of a Kirkendall plane, and hence, there is a high diffusion rate of aluminum in this phase.

KW - Aluminum-nickel binary alloys

KW - Diffusion

KW - Electron microscopy

KW - Grain boundary diffusion

KW - Intermetallics

KW - Kirkendall effect

U2 - 10.1016/j.matchar.2017.05.039

DO - 10.1016/j.matchar.2017.05.039

M3 - Journal article

SN - 1044-5803

VL - 130

SP - 105

EP - 112

JO - Materials Characterization

JF - Materials Characterization

ER -

Nickel-aluminum diffusion: A study of evolution of microstructure and phase

Abstract

Keywords

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