Room temperature strain rate sensitivity of as-built 3D printed AlSi10Mg by laser powder bed fusion

Abstract

Tensile and compression loading behavior of as-built AlSi10Mg alloy printed by laser powder bed fusion were studied at quasi-static to medium strain-rate regimes. A non-linear strain rate sensitivity behaviour was observed at all strain rates, a response linked to the extra-fine, non-equilibrium as-built microstructure. For both loading conditions, except for a negative strain rate sensitivity in 10−2–10−1 1/s range, a positive trend was observed. At the equivalent strain of 0.04, a strain rate sensitivity parameter of 0.010 and 0.019 (in 10−4–10−2 1/s range) was measured for tensile and compression loading, respectively, indicating a strong dependency especially in compression. For the medium regime (1–5 1/s), the strain rate sensitivity parameter in compression was further increased to 0.046.