DESCRIPTION OF THE CREEP-BEHAVIOR OF THE PRECIPITATION-HARDENED MATERIAL AL-CU-MG ALLOY-2024 USING FINITE-ELEMENT COMPUTATIONS BASED ON MICROSTRUCTURE MECHANICAL MODELS

Precipitation-hardened materials change their microstructure during cr eep exposure which not only affects the shape of the creep curve but a lso the rupture time. This effect can be clearly shown on ageable alum inium alloys like Duralumin 2024 (AI-Cu-ME). The goal of the numerical simulation of the materials behaviour under high temperature conditio ns is to describe the: creep response under special consideration of i nternal back-stress and precipitation kinetics, and to implement corre sponding microstructural parameters into an FEM programme. Thus a fini te element programme was developed which simulates creep behaviour by taking structure mechanics into consideration.