Abstract
In this work, atom probe tomography technique is used to investigate how wire arc additive manufacturing (WAAM) changes the nanochemistry of nanoprecipitates and grain boundaries after peak aging of a high strength Al-Zn-Mg-Cu alloy. The effect of the change in nanochemistry of nanoprecipitates on the hydrogen embrittlement of the additively manufactured aluminum alloy is investigated using a three-point bending test in humid air. The results show that the unique in-process heat treatment during WAAM, offers the possibility to modify the nanochemistry of nanoprecipitates and improve the resistance to hydrogen embrittlement of the Al-Zn-Mg-Cu alloys in the peak aged state without sacrificing mechanical performance. Density functional theory shows that the WAAM process transforms the interfaces between matrix and precipitate into a strong hydrogen trap, which can reduce the hydrogen content of grain boundaries and suppress hydrogen-induced intergranular fracture.
| Translated title of the contribution | Entwicklung von wasserstoffversprödungsbeständigen 7xxx-T6-Aluminiumlegierungen auf der Grundlage der additiven Fertigung mit Drahtbogen: Veränderte Nanochemie der verfestigenden Ausscheidungen |
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| Original language | English |
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Materials & Design |
| Volume | 243 |
| Issue number | 113030 |
| Publication status | Published - 23 May 2024 |
Research Field
- Wire-Based Additive Manufacturing