Abstract
Braze clad on aluminum (Al) sheets has enabled fast and convenient brazing assembly of complex heat exchangers. However, there are details in the brazing process that are not fully understood. Herein, 3D X‐ray diffraction (3DXRD) is used to investigate the grain position, size, and orientation before and after controlled atmosphere brazing (CAB). The outcomes are presented as maps of center‐of‐mass positions with relative grain size distribution and color‐coded grain orientations. The results show that, for braze clad Al sheets exposed to CAB simulation, it is possible to distinguish grains from the solidified AlSi alloy from those in the core Al alloy. It is also possible to distinguish new grains obtained through recrystallization during CAB. Hence, the study shows that stretching of the rolled Al sheet by 6% provides enough stored energy in the core material so that recrystallization occurs during CAB and, in addition, provides conditions for AlSi alloy grain growth into the core material. While the phenomenon is well known, it is poorly understood for processes in connection with brazing of mechanically formed Al alloy components in heat exchanger assemblies, and these results demonstrate the potential for gaining deeper insights through 3DXRD.
Highlights
The results show that, for braze clad Al sheets exposed to controlled atmosphere brazing (CAB) simulation, it is possible to distinguish grains from the solidified Al─Si alloy from those in the the brazing is, and the required fatigue strength of the unit.[3]
While the phenomenon is well known, it to as controlled atmosphere brazing (CAB), is poorly understood for processes in connection with brazing of mechanically the Al─Si braze alloy in the clad layer liqueformed Al alloy components in heat exchanger assemblies, and these results demonstrate the potential for gaining deeper insights through 3D X-ray diffraction (3DXRD)
The least interaction occurs when the core material has Figure 2a shows three cross-section light optical microscopy (LOM) images, where the image contrast arises from the interaction of plane-polarized light with individual grains of the rolled Al sheet that was studied in the present work
Summary
The brazing performance depends to a large extent on good fillet formation, the effect of the molten braze clad. The advantage of using braze clad on aluminum (Al) sheets is on the core material, and the structural integrity during brazing at that it enables fast and convenient brazing assembly of complex temperatures close to the solidus of the material.[3]. Heat exchangers that can meet the tough working requirements. There are many parameters involved in optimizing brazed aluin terms of heat performance, strength, formability, and minum sheets, of which one is the grain structure at the interface. Näslund Department of Physics, Chemistry and Biology (IFM) Linköping University Linköping SE-581 83, Sweden. Hektor Deutsches Elektronen-Synchrotron (DESY) Notkestrasse 85, Hamburg 22607, Germany.
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