Abstract
We investigated the effect of the iron and silicon concentrations on the fracture toughness of extruded strips 65 × 200 mm in section of aluminum alloy i)16. Strips with the normal concentrations of iron and silicon (~0.5%) and low concentrations (~0.1%) were tested in the naturalIy (D16T) and artificially (D16T1) aged conditions. The fracture toughness (KIc) was tested on samples for off-centered tensile tests (OCT) with a thickness of 65 mm. The fracture toughness tests were conducted by British standards; all the requirements for determining Kic of aluminum alloys were fulfilled [2]. The mechanical properties of the alloys are given in Table 1. For comparison, properties are also given for extruded strips of alloys AK4-1T1, V95T1, and a new American alloy X2048 intended for super
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