Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 15: Hydrogen in Materials: Hydrogen Effects
MM 15.2: Talk
Tuesday, September 6, 2022, 12:00–12:15, H46
Interplay of hydrogen with defects in Al alloys — •Poulami Chakraborty1, Huan Zhao1, Baptiste Gault1,2, Tilmann Hickel1,3, and Jörg Neugebauer1 — 1Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany — 2Department of Materials, Royal School of Mines, Imperial College London, United Kingdom — 3BAM Federal Institute for Materials Research and Testing, Berlin, Germany
Al alloys are used as major structural material in the aviation and more recently, automobile industries. This demands detail research of microstructural defects generated while usage. We have performed density functional theory calculations to study the competition of microstructural features including grain boundaries and second phase particles. The results reveal second phases as better trapping sites since H has a higher solubility compared to the GBs. However, it is seen that certain solutes such as Mg enhances the chance of HE at the forming surface during crack initiation. This is further supported by experimental data where a high strength 7xxx Al alloy is charged by deuterium using atom probe tomography (APT). Subsequently, we have extended our study to several other alloying elements such as Sc, Sn and Zr, at the GB which are inevitably present as impurities in technical alloys. Interestingly, it is seen that Sn strongly binds with H at the GB without increasing the embrittling tendency. Based on these insights, effective alloying strategies can be developed to improve the resistance to hydrogen embrittlement.