Abstract
The effective weight reduction in the automotive industry by the wide adoption of lightweight magnesium (Mg) alloys demands high-quality joint between magnesium alloys and massively-used steels in order to wring the excess weight with strength and safety assurance. However, Mg-steel joint is difficult to achieve because there is no mutual solubility between magnesium and steel and huge disparity in physical properties. An impact-based welding method recently showed successful Mg-steel joining. In this work, the characteristics of Mg-steel interface joined by the impact welding method were investigated. Synchrotron high-energy X-ray computed tomography and diffraction were applied to characterize the microstructure across Mg-steel interface. Results revealed a deposit layer formed at the joint interface where Fe-rich particles spread deep into the Mg matrix. High-resolution 3D morphology of Mg-steel interface demonstrated the trapped pores and cracks inside the deposit layer. The formation of the deposit layer and the void/cracking evolution were analyzed by using finite element models. These findings provide insights into the immiscible Mg-steel joining process.
| Original language | English |
|---|---|
| Article number | 141023 |
| Journal | Materials Science and Engineering: A |
| Volume | 813 |
| DOIs | |
| State | Published - May 5 2021 |
Funding
This work was supported by the U.S. Department of Energy's Vehicle Technologies Office , Joining Core Program, managed by Ms. Sarah Kleinbaum, at Argonne National Laboratory operated under Contract No. DE-AC02-06CH11357 by the UChicago Argonne, LLC. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. 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. This work was supported by the U.S. Department of Energy's Vehicle Technologies Office, Joining Core Program, managed by Ms. Sarah Kleinbaum, at Argonne National Laboratory operated under Contract No. DE-AC02-06CH11357 by the UChicago Argonne, LLC. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. 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 O?ce 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 | |
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | |
| Argonne National Laboratory | DE-AC02-06CH11357 |
| Oak Ridge National Laboratory | DE-AC05 00OR22725 |
Keywords
- Finite-element modeling
- Impact welding
- Mg-steel interface
- Synchrotron characterization