About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
|
| Presentation Title |
Hydrogen embrittlement of HPT-processed aluminium alloys and its prevention by hydrogen-absorbing nanoparticles |
| Author(s) |
Hiroyuki Toda, Yafei Wang, Hiro Fujihara, Yuki Ishii, Nozomu Adachi, Yoshitaka Todaka |
| On-Site Speaker (Planned) |
Hiroyuki Toda |
| Abstract Scope |
Ultrastrong materials sometimes face long-term durability issues due to hydrogen embrittlement and stress corrosion cracking, which become worse as strength increases. Here, we present a pioneering approach to mitigating hydrogen-induced embrittlement in ultrastrong materials. We demonstrate the mitigation strategy that ultrafine-grained Al-Zn-Mg-Cu alloys with strengths approaching one gigapascal can be made ductile through a heat treatment, by which meta-stable, hydrogen-absorbing nanoparticles are precipitated. Contrary to the conventional view that second phase particles contribute less to the mechanical properties of ultrafine-grained alloys due to deformation-induced dissolution, we demonstrate via high-resolution, three-dimensional observation that the nanoparticles within aluminium grains can remain even under ultrahigh shear strains of around one thousand. The remaining precipitates are exploitable and essential for achieving exceptional resistance to hydrogen embrittlement. This strategy of ageing-based modification of precipitates in nanograins may inspire the design of hydrogen-resistant, ultrastrong aluminium alloys across a broad strength–composition space. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Mechanical Properties, Characterization |