Thermal Analysis and Production of As-Cast Al 7075/6060 Bilayer Billets
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In: International Journal of Metalcasting, Vol. 13, No. 4, 01.10.2019, p. 817-829.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Thermal Analysis and Production of As-Cast Al 7075/6060 Bilayer Billets
AU - Greß, Thomas
AU - Mittler, Tim
AU - Schmid, Simon
AU - Chen, Hui
AU - Ben Khalifa, Noomane
AU - Volk, Wolfram
N1 - The “Determination and control of bonding properties in aluminum composites in the combination of compound casting and forming” project is funded by the German Research Foundation (DFG) under grant VO-1487/25-1. The authors acknowledge the financial support from the DFG. Furthermore, the authors would like to express their gratitude to the Fraunhofer Research Institute for Casting, Composite and Processing Technology IGCV for their assistance in the measurement of thermophysical data.
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Load-adjusted, weight-optimized components can be fabricated by following a multi-material approach. Integrating the respective advantages of strength and corrosion resistance of Al 7075 and Al 6060 into a single structural component leads to a complex property profile. Compound casting offers a high potential in terms of process chain shortening, material efficiency and bonding quality. The present paper focuses on the production of aluminum bilayer billets by multi-step, discontinuous compound casting. Process conditions influencing the formation of a cohesive bond at the interface are investigated. A fundamental thermal analysis is conducted in order to fully characterize the casting alloys. A process window for metallurgical bonding of Al 7075 and Al 6060 can be defined using a combined approach of process parameters and thermophysical data. The primary bonding mechanism is found to be the epitaxial solidification which occurs through remelting and recrystallization of the substrate alloy. Here the dendrite coherence point constitutes a critical level of the near-interface substrate temperature in terms of forming a solid solution. Epitaxy, phase composition and intermetallic diffusion processes are analyzed using SEM–EDS.
AB - Load-adjusted, weight-optimized components can be fabricated by following a multi-material approach. Integrating the respective advantages of strength and corrosion resistance of Al 7075 and Al 6060 into a single structural component leads to a complex property profile. Compound casting offers a high potential in terms of process chain shortening, material efficiency and bonding quality. The present paper focuses on the production of aluminum bilayer billets by multi-step, discontinuous compound casting. Process conditions influencing the formation of a cohesive bond at the interface are investigated. A fundamental thermal analysis is conducted in order to fully characterize the casting alloys. A process window for metallurgical bonding of Al 7075 and Al 6060 can be defined using a combined approach of process parameters and thermophysical data. The primary bonding mechanism is found to be the epitaxial solidification which occurs through remelting and recrystallization of the substrate alloy. Here the dendrite coherence point constitutes a critical level of the near-interface substrate temperature in terms of forming a solid solution. Epitaxy, phase composition and intermetallic diffusion processes are analyzed using SEM–EDS.
KW - Engineering
KW - thermal analysis
KW - aluminum bimetal
KW - dendrite coherence point
KW - compound casting
KW - bilayer billet
KW - epitaxy
UR - http://www.scopus.com/inward/record.url?scp=85062146302&partnerID=8YFLogxK
U2 - 10.1007/s40962-018-0282-8
DO - 10.1007/s40962-018-0282-8
M3 - Journal articles
VL - 13
SP - 817
EP - 829
JO - International Journal of Metalcasting
JF - International Journal of Metalcasting
SN - 1939-5981
IS - 4
ER -