Aluminum-Magnesium-Silicon Precipitation Phase
The aluminum-magnesium-silicon age-hardening phase is a coherent nanoscale precipitate in Al-Mg-Si alloys that dramatically increases yield strength by introducing lattice distortions.
Physical-Chemical Mechanism of Action
The aluminum-magnesium-silicon age-hardening phase forms through a coherent nanoscale precipitate in alloys of aluminum, magnesium, and silicon. This phase forms by introducing lattice distortions in the material, which drastically increases the yield strength.
Metallurgical Relevance & Risks in Welding
The age-hardening phase improves the mechanical properties of the alloy, especially its yield strength and toughness. However, it can also cause problems if not handled correctly during welding. For example, too rapid cooling can lead to uneven build-up of the age-hardening phase and cause local hardness differences in the material, which affects toughness.
Workshop Practice & Instructions
To optimally use the age-hardening phase and minimize its negative effects, it is important to carefully control the welding process. This includes an appropriate cooling rate to ensure a homogeneous build-up of the age-hardening phase. Recommended cooling times vary depending on the alloy and welding process, but generally should be between 10 and 30 seconds. Too rapid cooling can lead to uneven build-up and cause local hardness differences in the material.