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

被引：27

作者：

Alimadadi, Hossein ^{[1
]}

Kjartansdottir, Cecilia ^{[2
]}

Burrows, Andrew ^{[1
]}

Kasama, Takeshi ^{[1
]}

Moller, Per ^{[2
]}

机构：

[1] Tech Univ Denmark, Ctr Electron Nanoscopy, Bldg 307, DK-2800 Lyngby, Denmark

[2] Tech Univ Denmark, Dept Mech Engn, Bldg 425, DK-2800 Lyngby, Denmark

来源：

MATERIALS CHARACTERIZATION | 2017年 / 130卷

关键词：

Diffusion; Kirkendall effect; Intermetallics; Aluminum-nickel binary alloys; Grain boundary diffusion; Electron microscopy; NI-AL; GROWTH-KINETICS; NIAL3; FORMATION; AL/NI; MECHANISMS; PREDICTION; ELECTRODES; RESOLUTION; OXIDATION; COUPLES;

D O I：

10.1016/j.matchar.2017.05.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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/y-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.

引用

页码：105 / 112

页数：8

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