Precipitation, mechanical properties and early slant ductile fracture in cyclic and naturally aged Al-Zn-Mg(-Cu) alloys

• DOI: 10.1016/j.matdes.2022.111026
• Publication Date: 2022-08-05T15:26:08Z
• Authors: Sohail Shah; Akash Gopal; Elisabeth Thronsen; Constantinos Hatz...; Bjørn Holmedal
• Keywords: Necking; Elongation; Precipitation hardening; Atom probe; Hardening (computing)

Natural and artificial ageing treatments are compared with by cyclic deformation at room temperature. Atom probe tomography transmission electron microscopy revealed that a fine distribution of GP-zones, was responsible for the strength after ageing. Ten days further natural allowed these early-stage clusters to grow into more stable ones, thereby improving mechanical response. This resulted in similar tensile uniform elongation as peak aged condition It found fracture samples occurred earlier, form ductile slant shear without necking advance. In all cases, started about same point reaching maximum strength, i.e., limit. However, an treatment hardening treatment, ordinary behavior seen, samples. had GP-zones hardened mode, indicating precipitation structure controls type. Similar observed two different Al-Zn-Mg alloys, copper.