Stress partitioning behavior of an AlSi10Mg alloy produced by selective laser melting during tensile deformation using in situ neutron diffraction

Micromechanical stress partitioning between Al and Si constituents in an AlSi10Mg alloy fabricated by selective laser melting was determined during uniaxial tensile loading. In situ neutron diffraction method was utilized for the measurements of the lattice strains from a set of Al and Si grains separately and the strain components were correlated to the stress evolution of each alloy constituent. The elastic strain of the Al matrix saturated at about 3800 μϵ while it continuously increases up to 9000 μϵ in the plastic deformation region of the Si particles. The stress partitioning was estimated as 260 MPa for the Al matrix and 680 MPa for the Si particles on fracture. Microstructure of the fracture surface shows a number of large voids and cracks propagated along the soft Al matrix.