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Stability of microstructure and its evolution during solid-state annealing of Al(2)O(3)-Inconel 600 brazed couples

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Title Stability of microstructure and its evolution during solid-state annealing of Al(2)O(3)-Inconel 600 brazed couples
 
Creator LAIK, A
MISHRA, P
BHANUMURTHY, K
KALE, GB
KASHYAP, BP
 
Subject TO-METAL JOINTS
RESIDUAL-STRESSES
GLASS-MIGRATION
ALUMINA
ALLOYS
SEALS
MECHANISM
SYSTEM
COPPER
Brazing
Microstructure
Multicomponent diffusion
Morphological stability
 
Description The stability of the microstructure of alumina-Inconel 600 brazed joints was investigated under simulated in-service conditions by subjecting them to prolonged heat treatment at 400 and 560 degrees C. The evolution of the microstructure and microchemistry of the brazing zone was examined using extensive microanalysis of the constituent phases. The layered structure of the brazing zone transformed to homogeneous, near-equilibrium, two-phase microstructure after heat treatment at 560 C. Solid-state interdiffusion was identified as a primary factor responsible for such copious modification of the microstructure. Intermediate temperature heat treatment at 400 degrees C revealed that the mechanism of transformation of the microstructure was globulization of the Ni overlayer and dissolution of Mo from the metallization layer into the Ni-rich phase. The migration behavior of each of the elements, in response to heat treatment, was analyzed. Cr was found to diffuse out of Inconel and form a layer of Cr(2)O(3) at the alumina-brazing alloy interface. The bond strength of the interface was high enough to cause cohesive failure in the alumina side of the joints. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2012-06-26T06:08:06Z
2012-06-26T06:08:06Z
2011
 
Type Article
 
Identifier ACTA MATERIALIA,59(13)5092-5102
1359-6454
http://dx.doi.org/10.1016/j.actamat.2011.04.041
http://dspace.library.iitb.ac.in/jspui/handle/100/14007
 
Language English