| Abstract Scope |
Al5000 series alloys are widely used for boat and ship structural applications because they exhibit good weldability, formability and high strength to weight ratio. However, these alloys become susceptible to stress corrosion cracking as a result of thermal exposure in the range of 50-200C, which results in the precipitation of beta phase, Al3Mg2 at grain boundaries from Al(Mg) solid solution. Early stage detection and estimation of beta phase in the range of 50 to 70C is often difficult as the Mg supersaturation level is not constant throughout the sample. Even in fully sensitized condition, TEM results show a fraction of grain boundaries does not contain beta phase as a result of variation in Mg content. In this presentation, we demonstrate a method to detect and estimate the beta phase fraction at relatively low temperatures by analyzing the peak shift of Al(Mg) solid solution using high-resolution XRD. |