| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
2022 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-20: Effects of Cu on the Interfacial Stability of Nanoprecipitates in Al-Zn-Mg-Cu Alloys from First-principles Investigations |
| Author(s) |
Yu-ning Chiu, Chung-yi Yu, Shih-kang Lin |
| On-Site Speaker (Planned) |
Yu-ning Chiu |
| Abstract Scope |
The benefit of Cu on preventing thermally induced precipitate transitions and resultant softening in 7000 series aluminium alloys (Al-Zn-Mg-Cu alloys) has been well studied over the past decades. However, the stabilization mechanism of Cu has yet been understood clearly. As a result, the interfacial structures and energetics of nanoprecipitates η’ and η2 in Al-Zn-Mg-Cu alloys were thoroughly investigated through first-principles calculations. The most feasible interfacial structures for η’ and η2 with Cu segregated in were constructed, and with which, a comprehensive discussion on interfacial energy and strain energy as well as atomic local strain hydrostatic invariant (ALSHI) were provided to study the effect of Cu. In this study, we concluded that the main driving force for induced interfacial segregation and resultant stabilization were mostly contributed from the relieved strain energy. Thus, ALSHI can serve as a considerably useful guideline for optimal interfacial segregation and future alloy design of Al-Zn-Mg-Cu alloys. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Aluminum, Phase Transformations, Computational Materials Science & Engineering |