The tensile fracture of a medium strength high purity Al-5. 75Zn-1. 95Mg alloy and a commercial Al-5Zn-1. 2Mg alloy was investigated. Mechanisms are proposed for the quantitative description of both grain boundary and catastrophic shear failures. The role of natural aging in increasing the ductility is emphasized together with the deleterious influence of the as-cast grain structure. A simple schematic diagram is proposed to describe the fracture behavior of precipitation hardened alloys as a function of heat treatment and testing temperature.
Authors
Embury JD; Nes E
Journal
Zeitschrift Fuer Metallkunde Materials Research and Advanced Techniques, Vol. 65, No. 1, pp. 45–55