Abstract
Stress corrosion resistance of 7050 extrusions with four levels of purity was investigated in the extruding direction. In the case of T651, the most superior resistance was found in the alloy with 0.24% (Fe+Si), in this experiment, and increasing or decreasing purity resulted in a lowering of resistance. Marked improvement of resistance was obtained by the over-aging treatment (T751) for each alloys, although a similar purity effect was also detected. A lowering of resistance with decreasing purity seems to be due to the increase of amounts of inclusions acting as crack sites. On the other hand, a reducing of resistance with increasing purity appears to be owing to development of the double fiber texture with and which can cause localized brittle fracture at a lower load. To select the optimum purity and/or to avoid severe development of the double fiber texture are preferable to improve resistance of extrusions in the extruding direction.
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