Effects of additive manufacturing on the dynamic response of AlSi10Mg to laser shock loading

M. Laurençon (1, 2) , Thibaut de Rességuier (2) , D. Loison (3) , J. Baillargeat (4) , J.N. Domfang Ngnekou (2) , Y. Nadot (2)

1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 ENDO - ENDOmmagement et durabilité [Institut Pprime]
3 IPR - Institut de Physique de Rennes
4 PPrime [Poitiers] - Institut Pprime [UPR 3346]

In this study, the dynamic behaviour of light aluminum alloy AlSi10Mg obtained by additive manufacturing was investigated under laser shock loading. Two types of AlSi10Mg specimens were obtained by Selective Laser Melting (SLM) with two sets of building parameters, leading to specific architecture and microstructure compared to classical manufacturing processes. Their dynamic response to laser driven shocks was investigated on the basis of time-resolved measurements of free surface velocity, transverse visualization of shock-induced fragmentation, and post-recovery observations by means of microscopy. The results reveal a significant influence of the building parameters and SLM-inherited defects on both yield strength and spall strength values, as well as a strong dependence of high rate fracture behaviour on building direction of the material, mainly governed by melt pools shape and dissymmetry, with a combination of "interpool" and "intrapool" fracture modes.

Mots clés: AlSi10Mg; Selective Laser Melting; laser shocks; dynamic response; spall fracture

Domaines: Sciences de l'ingénieur [physics]

M. Laurençon, Thibaut de Rességuier, D. Loison, J. Baillargeat, J.N. Domfang Ngnekou, et al.. Effects of additive manufacturing on the dynamic response of AlSi10Mg to laser shock loading. Materials Science and Engineering: A, 2019, 748, pp.407-417. ⟨10.1016/j.msea.2019.02.001⟩. ⟨hal-03079592⟩