Molecular dynamics study on interface formation and bond strength of impact-welded Mg-steel joints

Jiahao Cheng; Xiaohua Hu; Xin Sun

doi:10.1016/j.commatsci.2020.109988

Molecular dynamics study on interface formation and bond strength of impact-welded Mg-steel joints

Jiahao Cheng, Xiaohua Hu, Xin Sun

Deposition Science and Technology

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

It was recently demonstrated that the vaporizing foil actuator welding (VFAW) method can directly join immiscible magnesium and steel alloys without coating or a third chemical element based intermetallic compound layer. The VFAW Mg/steel joint exhibits a mixed interface layer of up to 200μm thickness consisting of Mg matrix and Fe particles. Multi-scale process simulations have suggested the formation of the interlayer is from the high-velocity frictional shearing between the Mg/steel substrates during the oblique impact in the VFAW process. This paper investigates the formation of Mg-Fe interlayer under VFAW condition with different shearing velocities using molecular dynamics (MD) models, and studies the bonding strength under different scenarios. The results elucidate the critical role of shearing velocity and surface roughness in achieving desirable Mg/Fe joint.

Original language	English
Article number	109988
Journal	Computational Materials Science
Volume	185
DOIs	https://doi.org/10.1016/j.commatsci.2020.109988
State	Published - Dec 2020

Funding

This research was sponsored by the US Department of Energy, Office of Vehicle Technology, under a prime contract with Oak Ridge National Laboratory (ORNL). ORNL is managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract DE-AC05 00OR22725. This work was funded by the DOE Vehicle Technologies Office under the Automotive Lightweight Materials Program managed by Ms. Sarah Kleinbaum. Computing support by The Compute and Data Environment for Science (CADES) at Oak Ridge National Laboratory is gratefully acknowledged. The raw/processed data required to reproduce these findings cannot be shared at this time due to technical or time limitations. This research was sponsored by the US Department of Energy, Office of Vehicle Technology, under a prime contract with Oak Ridge National Laboratory (ORNL). ORNL is managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract DE-AC05 00OR22725. This work was funded by the DOE Vehicle Technologies Office under the Automotive Lightweight Materials Program managed by Ms. Sarah Kleinbaum. Computing support by The Compute and Data Environment for Science (CADES) at Oak Ridge National Laboratory is gratefully acknowledged.

Funders	Funder number
Data Environment for Science
Office of Vehicle Technology
US Department of Energy
U.S. Department of Energy	DE-AC05 00OR22725
Oak Ridge National Laboratory

Keywords

Immiscible materials
Interface
Joining strength
Molecular dynamics simulation
Vaporizing foil actuator welding

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10.1016/j.commatsci.2020.109988

Cite this

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title = "Molecular dynamics study on interface formation and bond strength of impact-welded Mg-steel joints",

abstract = "It was recently demonstrated that the vaporizing foil actuator welding (VFAW) method can directly join immiscible magnesium and steel alloys without coating or a third chemical element based intermetallic compound layer. The VFAW Mg/steel joint exhibits a mixed interface layer of up to 200μm thickness consisting of Mg matrix and Fe particles. Multi-scale process simulations have suggested the formation of the interlayer is from the high-velocity frictional shearing between the Mg/steel substrates during the oblique impact in the VFAW process. This paper investigates the formation of Mg-Fe interlayer under VFAW condition with different shearing velocities using molecular dynamics (MD) models, and studies the bonding strength under different scenarios. The results elucidate the critical role of shearing velocity and surface roughness in achieving desirable Mg/Fe joint.",

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author = "Jiahao Cheng and Xiaohua Hu and Xin Sun",

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language = "English",

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AU - Cheng, Jiahao

AU - Hu, Xiaohua

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PY - 2020/12

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N2 - It was recently demonstrated that the vaporizing foil actuator welding (VFAW) method can directly join immiscible magnesium and steel alloys without coating or a third chemical element based intermetallic compound layer. The VFAW Mg/steel joint exhibits a mixed interface layer of up to 200μm thickness consisting of Mg matrix and Fe particles. Multi-scale process simulations have suggested the formation of the interlayer is from the high-velocity frictional shearing between the Mg/steel substrates during the oblique impact in the VFAW process. This paper investigates the formation of Mg-Fe interlayer under VFAW condition with different shearing velocities using molecular dynamics (MD) models, and studies the bonding strength under different scenarios. The results elucidate the critical role of shearing velocity and surface roughness in achieving desirable Mg/Fe joint.

AB - It was recently demonstrated that the vaporizing foil actuator welding (VFAW) method can directly join immiscible magnesium and steel alloys without coating or a third chemical element based intermetallic compound layer. The VFAW Mg/steel joint exhibits a mixed interface layer of up to 200μm thickness consisting of Mg matrix and Fe particles. Multi-scale process simulations have suggested the formation of the interlayer is from the high-velocity frictional shearing between the Mg/steel substrates during the oblique impact in the VFAW process. This paper investigates the formation of Mg-Fe interlayer under VFAW condition with different shearing velocities using molecular dynamics (MD) models, and studies the bonding strength under different scenarios. The results elucidate the critical role of shearing velocity and surface roughness in achieving desirable Mg/Fe joint.

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Molecular dynamics study on interface formation and bond strength of impact-welded Mg-steel joints

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Keywords

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