Dendritic growth in Al-Si alloys during brazing. Part 1: Experimental evidence and kinetics

D. P. Sekulic; P. K. Galenko; M. D. Krivilyov; L. Walker; F. Gao

doi:10.1016/j.ijheatmasstransfer.2005.01.034

Dendritic growth in Al-Si alloys during brazing. Part 1: Experimental evidence and kinetics

D. P. Sekulic, P. K. Galenko, M. D. Krivilyov, L. Walker, F. Gao

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

30 Scopus citations

Abstract

This work provides empirical evidence needed for an in depth phenomenological study of dendrite growth phenomena during brazing of aluminum alloys in form of composite brazing sheets. The main objective of this study was (1) a collection of experimental evidence associated with heat and mass transfer modeling of the Al + Si solid solution dendrite macro morphology evolution inherent to joint formation during brazing, and (2) the dendrite growth kinetics analysis. The isothermal dwell and the quench that follow the clad molten aluminum binary alloy surface-tension-driven flow into the joint at the peak brazing temperature upon melting lead to the solidification of the metal micro layer and joint formation. Before, during and after the isothermal dwell a significant reduction of Si content in the melt is found. So, a subsequent dissolution may affect the interface zone between the molten clad and substrate. α-phase dendrite assemblies imbedded in an irregular eutectic in the joint zone are the main morphological features of the solidification microstructures. The major characteristic of the phenomenon is a sensitivity of the dendrite pattern selection and dendrite population on brazing process parameters, in particular on the temperature during the dwell.

Original language	English
Pages (from-to)	2372-2384
Number of pages	13
Journal	International Journal of Heat and Mass Transfer
Volume	48
Issue number	12
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2005.01.034
State	Published - Jun 2005

Bibliographical note

Funding Information:
The National Science Foundation has provided support through the NSF Grant DMI-9908319, monitored by Dr. Delcie Durham and Dr. Julie Chen. P.K. Galenko acknowledges support from the Alexander von Humboldt Foundation through the research program no. IV RUS 1068584. A portion of this work was supported by Assistant Secretary for Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory user program at ORNL, managed by UT—Battelle, LLC, for the US DOE under contract # DE-AC05-00OR22725 through the project #UA-90-015. One of the co-authors (GF) would like to express his appreciation for the support provided by CRMS, College of Engineering at the UK through a research assistantship. Numerical calculations were performed in part thanks to support from the University of Kentucky Computing Center and the University of Kentucky Center for Computational Sciences (CCS) that operates within the framework of the National Center for Supercomputing Applications (NCSA).

Funding

The National Science Foundation has provided support through the NSF Grant DMI-9908319, monitored by Dr. Delcie Durham and Dr. Julie Chen. P.K. Galenko acknowledges support from the Alexander von Humboldt Foundation through the research program no. IV RUS 1068584. A portion of this work was supported by Assistant Secretary for Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory user program at ORNL, managed by UT—Battelle, LLC, for the US DOE under contract # DE-AC05-00OR22725 through the project #UA-90-015. One of the co-authors (GF) would like to express his appreciation for the support provided by CRMS, College of Engineering at the UK through a research assistantship. Numerical calculations were performed in part thanks to support from the University of Kentucky Computing Center and the University of Kentucky Center for Computational Sciences (CCS) that operates within the framework of the National Center for Supercomputing Applications (NCSA).

Funders	Funder number
Assistant Secretary for Energy
CRMS
Stanley and Karen Pigman College of Engineering
Office of Transportation Technologies
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory	DE-AC05-00OR22725, -90-015
Alexander von Humboldt-Stiftung
Oak Ridge National Laboratory
University of Tampa
National Centre for Supercomputing Applications	NCSA
University of Kentucky Information Technology Department and Center for Computational Sciences	CCS
National Science Foundation (NSF)	DMI-9908319

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/j.ijheatmasstransfer.2005.01.034

Cite this

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title = "Dendritic growth in Al-Si alloys during brazing. Part 1: Experimental evidence and kinetics",

abstract = "This work provides empirical evidence needed for an in depth phenomenological study of dendrite growth phenomena during brazing of aluminum alloys in form of composite brazing sheets. The main objective of this study was (1) a collection of experimental evidence associated with heat and mass transfer modeling of the Al + Si solid solution dendrite macro morphology evolution inherent to joint formation during brazing, and (2) the dendrite growth kinetics analysis. The isothermal dwell and the quench that follow the clad molten aluminum binary alloy surface-tension-driven flow into the joint at the peak brazing temperature upon melting lead to the solidification of the metal micro layer and joint formation. Before, during and after the isothermal dwell a significant reduction of Si content in the melt is found. So, a subsequent dissolution may affect the interface zone between the molten clad and substrate. α-phase dendrite assemblies imbedded in an irregular eutectic in the joint zone are the main morphological features of the solidification microstructures. The major characteristic of the phenomenon is a sensitivity of the dendrite pattern selection and dendrite population on brazing process parameters, in particular on the temperature during the dwell.",

author = "Sekulic, {D. P.} and Galenko, {P. K.} and Krivilyov, {M. D.} and L. Walker and F. Gao",

note = "Funding Information: The National Science Foundation has provided support through the NSF Grant DMI-9908319, monitored by Dr. Delcie Durham and Dr. Julie Chen. P.K. Galenko acknowledges support from the Alexander von Humboldt Foundation through the research program no. IV RUS 1068584. A portion of this work was supported by Assistant Secretary for Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory user program at ORNL, managed by UT—Battelle, LLC, for the US DOE under contract # DE-AC05-00OR22725 through the project #UA-90-015. One of the co-authors (GF) would like to express his appreciation for the support provided by CRMS, College of Engineering at the UK through a research assistantship. Numerical calculations were performed in part thanks to support from the University of Kentucky Computing Center and the University of Kentucky Center for Computational Sciences (CCS) that operates within the framework of the National Center for Supercomputing Applications (NCSA). ",

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AU - Krivilyov, M. D.

AU - Walker, L.

AU - Gao, F.

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PY - 2005/6

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N2 - This work provides empirical evidence needed for an in depth phenomenological study of dendrite growth phenomena during brazing of aluminum alloys in form of composite brazing sheets. The main objective of this study was (1) a collection of experimental evidence associated with heat and mass transfer modeling of the Al + Si solid solution dendrite macro morphology evolution inherent to joint formation during brazing, and (2) the dendrite growth kinetics analysis. The isothermal dwell and the quench that follow the clad molten aluminum binary alloy surface-tension-driven flow into the joint at the peak brazing temperature upon melting lead to the solidification of the metal micro layer and joint formation. Before, during and after the isothermal dwell a significant reduction of Si content in the melt is found. So, a subsequent dissolution may affect the interface zone between the molten clad and substrate. α-phase dendrite assemblies imbedded in an irregular eutectic in the joint zone are the main morphological features of the solidification microstructures. The major characteristic of the phenomenon is a sensitivity of the dendrite pattern selection and dendrite population on brazing process parameters, in particular on the temperature during the dwell.

AB - This work provides empirical evidence needed for an in depth phenomenological study of dendrite growth phenomena during brazing of aluminum alloys in form of composite brazing sheets. The main objective of this study was (1) a collection of experimental evidence associated with heat and mass transfer modeling of the Al + Si solid solution dendrite macro morphology evolution inherent to joint formation during brazing, and (2) the dendrite growth kinetics analysis. The isothermal dwell and the quench that follow the clad molten aluminum binary alloy surface-tension-driven flow into the joint at the peak brazing temperature upon melting lead to the solidification of the metal micro layer and joint formation. Before, during and after the isothermal dwell a significant reduction of Si content in the melt is found. So, a subsequent dissolution may affect the interface zone between the molten clad and substrate. α-phase dendrite assemblies imbedded in an irregular eutectic in the joint zone are the main morphological features of the solidification microstructures. The major characteristic of the phenomenon is a sensitivity of the dendrite pattern selection and dendrite population on brazing process parameters, in particular on the temperature during the dwell.

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ER -

Dendritic growth in Al-Si alloys during brazing. Part 1: Experimental evidence and kinetics

Abstract

Bibliographical note

Funding

ASJC Scopus subject areas

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