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Title of Journal: Metall and Mat Trans A

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Abbravation: Metallurgical and Materials Transactions A

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Springer US

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DOI

10.1016/0002-9394(80)90290-1

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ISSN

1543-1940

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Relationship Between Microstructure Strength and

Authors: Quentin Puydt Sylvain Flouriot Sylvain Ringeval Frédéric De Geuser Guillaume Parry Alexis Deschamps
Publish Date: 2014/09/19
Volume: 45, Issue: 13, Pages: 6129-6140
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Abstract

This work presents a detailed multiscale spatially resolved study of the microstructure of an electron beam butt weld of the ENAW 7020 AlZnMg alloy Using a combination of optical scanning and transmission electron microscopy differential scanning calorimetry and smallangle Xray scattering the distribution of phases in the different areas of the heataffected zone and of the fusion zone is quantitatively characterized for two different aging states naturally aged after welding and artificially aged at 423 K 150 °C The heataffected zone consists of regions experiencing different levels of precipitate dissolution and coarsening during welding as well as new precipitation during postwelding heat treatment PWHT The microstructure of the fusion zone is typical from a fast solidification process with a strong solute segregation in the interdendritic zones The precipitate distribution after PWHT follows this solute distribution and the resulting hardness is much lower than the relatively homogeneous value in the base metal and the heataffected zoneThe authors are very grateful to the staff of CEA Valduc for welding and metallography Florence Robaud is thanked for the EPMA measurement Frederic Charlot is gratefully acknowledged for his assistance on electron imaging The staff of BM2/D2AM beamline of ESRF thanked for technical support

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