Details

Autor(en) / Beteiligte

• Wang, Kaifeng
• Shang, Shun-Li
• Wang, Yuxiang
• Vivek, Anupam
• Daehn, Glenn
• Liu, Zi-Kui
• Li, Jingjing

Titel

Unveiling non-equilibrium metallurgical phases in dissimilar Al-Cu joints processed by vaporizing foil actuator welding

Ist Teil von

• Materials & design, 2020-01, Vol.186 (C), p.108306, Article 108306

Ort / Verlag

United Kingdom: Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• An integrated experimental and computational approach has been adopted to investigate the formation mechanism of intermetallic compounds (IMCs) in dissimilar Al-Cu joints processed by vaporizing foil actuator welding (VFAW). Aiming to understand the formation of IMCs and their transition, the present work employed first-principles calculations of thermodynamic properties as a function of temperature and pressure together with diffusivities of Al and Cu from the literature. Agreeing with experimental observations, the predicted IMC formation sequence in the low-energy welding region is as follows. θ-Al2Cu forms first due to the fast diffusivity of Cu in the Al-matrix. θ-Al2Cu then transforms to η2-AlCu because of the fast diffusivities of Al/Cu in θ-Al2Cu. In the high-energy welding region, the stable γ1-Al4Cu9 and the metastable θ’’-Al3Cu are also formed in addition to the aforementioned θ-Al2Cu and η2-AlCu. η2-AlCu and considerable γ1-Al4Cu9 are the major phases in the high-energy welding region. The present approach, combining experiments and calculations, is proven to be a practical way to understand non-equilibrium metallurgical processes, as demonstrated through the study of VFAW Al-Cu joints. [Display omitted] •Stable and metastable Al-Cu intermetallic compounds are characterized experimentally.•Formation of Al-Cu intermetallic compounds is mainly controlled by diffusion and temperature.•An integrated approach is proposed to understand non-equilibrium metallurgical processes.