Influence of creep on the microstructure of Zn-Al-Cu alloys aged at 250°C

This paper is a continuation of a microstructural study of ZA alloys subjected to ageing at different temperatures with subsequent creep at 20 and 120 °C. it was already established that the samples aged for one week at 100 and 250 °C show the slowest creep rate. Furthermore, the resuits obtained afler ageing at 250 °C are better than those obtained after ageing at 100 °C. In order to explain more correctly these resuits, the microstructure is studied after ageing at 250 oc and subsequent creep at room temperature under pressure at 100 MPa and at 120 °c under pressure at 40 MPa, on test samples broken after the respective creep.