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Formation mechanisms and atomic configurations of nitride phases at the interface of aluminum nitride and titanium

Published online by Cambridge University Press:  31 January 2011

Chia-Hsiang Chiu  and
Chien-Cheng Lin
Chia-Hsiang Chiu
Affiliation:
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan
Chien-Cheng Lin*
Affiliation:
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan
*
a)Address all correspondence to this author. e-mail: chienlin@faculty.nctu.edu.tw
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Abstract

Aluminum nitride was bonded with a titanium foil at 1400 °C for up to 1 h in Ar. The AlN/Ti interfacial reactions were investigated using analytical electron microscopy. Reaction layers, consisting of δ-TiN, τ2-Ti2AlN, γ-TiAl, α2-Ti3Al, a two-phase region (α2-Ti3Al + α-Ti), and α-Ti (Al, N) solid solution, were observed after annealing at 1400 °C for 0.1 h. Among these phases, the α2-Ti3Al and (α2-Ti3Al + α-Ti) were formed during cooling. Further diffusion of N atoms into the reaction zone precipitates a chopped fiber-like α2-Ti2AlN in the matrix of γ-TiAl, with [110]γ−TiAl//[11¯20]τ2−Ti2AlN and (1¯1¯1)γ−TiAl//(1¯10¯3)τ2−Ti2AlN, by substituting N atoms for one-half Al atoms after annealing at 1400 °C for 1 h. The released Al atoms, due to the precipitation of τ2-Ti2AlN, resulted in an ordered Al-rich γ-TiAl or Ti3Al5. Furthermore, the α-Ti (Al, N) was nitridized into a lamellar layer (δ-TiN + α-Ti) with [110]δ−TiN//[11¯20]α−Ti and (111)δ−TiN//(0001)α−Ti.

Keywords

NitridePhase transformationTi
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2221 - 2228
Copyright
Copyright © Materials Research Society 2008

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