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

Abstract

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 firstprinciples 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 highenergy 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.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1574029
Alternate Identifier(s):
OSTI ID: 1799514
Grant/Contract Number:  
EE0008456; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Materials & Design
Additional Journal Information:
Journal Name: Materials & Design Journal Volume: 186 Journal Issue: C; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; Materials Science; Vaporizing foil actuator welding (VFAW); Al-Cu intermetallic compounds; Thermodynamic properties; Diffusion; First-principles and phonon calculations

Citation Formats

Wang, Kaifeng, Shang, Shun-Li, Wang, Yuxiang, Vivek, Anupam, Daehn, Glenn, Liu, Zi-Kui, and Li, Jingjing. Unveiling non-equilibrium metallurgical phases in dissimilar Al-Cu joints processed by vaporizing foil actuator welding. United Kingdom: N. p., 2020. Web. doi:10.1016/j.matdes.2019.108306.
Wang, Kaifeng, Shang, Shun-Li, Wang, Yuxiang, Vivek, Anupam, Daehn, Glenn, Liu, Zi-Kui, & Li, Jingjing. Unveiling non-equilibrium metallurgical phases in dissimilar Al-Cu joints processed by vaporizing foil actuator welding. United Kingdom. https://doi.org/10.1016/j.matdes.2019.108306
Wang, Kaifeng, Shang, Shun-Li, Wang, Yuxiang, Vivek, Anupam, Daehn, Glenn, Liu, Zi-Kui, and Li, Jingjing. Wed . "Unveiling non-equilibrium metallurgical phases in dissimilar Al-Cu joints processed by vaporizing foil actuator welding". United Kingdom. https://doi.org/10.1016/j.matdes.2019.108306.
@article{osti_1574029,
title = {Unveiling non-equilibrium metallurgical phases in dissimilar Al-Cu joints processed by vaporizing foil actuator welding},
author = {Wang, Kaifeng and Shang, Shun-Li and Wang, Yuxiang and Vivek, Anupam and Daehn, Glenn and Liu, Zi-Kui and Li, Jingjing},
abstractNote = {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 firstprinciples 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 highenergy 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.},
doi = {10.1016/j.matdes.2019.108306},
journal = {Materials & Design},
number = C,
volume = 186,
place = {United Kingdom},
year = {2020},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.matdes.2019.108306

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