Abstract
The dynamic response of selective laser melting (SLM)-processed and sand cast Al10SiMg samples were studied in a series of planar impact experiments. It was found that the dynamic response of SLM-processed alloys is virtually independent of the processing orientation. The dynamic yield strength and tensile (spall) strengths of SLM-processed material exceeds those of the cast alloy by factors of two and four, respectively. It was found that with increase in the tensile strain rate ε̇t, the fracture mode of SLM-processed material changes from apparently ductile at strain rates below ε̇t≈5×103s−1 to evidently brittle above this threshold. At approximately the same strain rate and at shear stress greater than 65MPa, the mechanism governing the compressive (yield) strength of the SLM-processed alloy also changes from thermally-activated passage of obstacles by moving dislocations to dislocation over-barrier glide controlled by phonon viscous drag.
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