“…To the knowledge of the authors, the ΔK threshold values for the investigated alloys in an as-cast condition are not available in the literature. Available data report a ΔK threshold range of 3.3-5.1 MPa • √ m for unmodified and Sr-modified A356 and A319 alloys in T4, T61, and T71 heat-treated conditions [11] . The miniature samples in this investigation could not be directly compared to the other work because of a possible scale effect.…”