Stress distribution in the solidified melt pool of L-PBF manufactured Al alloys : effect of microstructure and consequences on thermal treat

New high performances aluminum alloys used for additive manufacturing are designed in order to benefit from the very high cooling rate offered by the process. Nevertheless their sensitivity to cracking during processing or post-processing need to be better understood and adressed. This proposal aims at quantifying, thanks to 3D µLaue profiles, the stress distribution as a function of the microstructure in the solidified melt pool. By changing the Zr content in the alloy, the volume fraction of equiaxed zone is monitored. The evolution of stress distribution as a function of the thermal treatment applied will be quantified by 3D µLaue profiles before and after an ex situ thermal treatment. The results will be confronted to already performed: intensive macroscopic mechanical tests, in situ SEM mechanical tests and in situ nano-tomography mechanical tests.