Abstract
Vaporizing foil actuator spot welding method is used in this paper to join magnesium alloy AZ31 and uncoated high-strength steel DP590, which are typically considered as un-weldable due to their high physical property disparities, low mutual solubility, and the lack of any intermetallic phases. Characterization results from scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) of the weld interface indicate that the impact creates an Mg nanocrystalline interlayer with abundant Fe particles. The interlayer exhibits intact bonding with both DP590 and AZ31 substrates. To investigate the fundamental bond formation mechanisms at the interface, a finite element (FE)-based process simulation is first performed to calculate the local temperature and deformation at the interface under the given macroscopic experimental condition. Taking the FE results at the interface as inputs, molecular dynamics (MD) simulations are conducted to study the interlayer formation at the Mg/Fe interface during the impact and cooling. The results found a high velocity shearing-induced mechanical mixing mechanism that mixes Mg/Fe atoms at the interface and creates the interlayer, leading to the metallurgical bond between Mg/steel alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 149-163 |
| Number of pages | 15 |
| Journal | Journal of Materials Science and Technology |
| Volume | 59 |
| DOIs | |
| State | Published - Dec 15 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. This work at The Ohio State University is supported by US Department of Energy under Contract No. DE-EE0007813 and National Science Foundation under a Major Research Instrument Grant No. 1531785. Experimental support from members of Impulse Manufacturing Laboratory, in particular Angshuman Kapil and Brian Ufferman, is also gratefully acknowledged. 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. This work at The Ohio State University is supported by US Department of Energy under Contract No. DE-EE0007813 and National Science Foundation under a Major Research Instrument Grant No. 1531785. Experimental support from members of Impulse Manufacturing Laboratory, in particular Angshuman Kapil and Brian Ufferman, is also gratefully acknowledged.
Keywords
- Finite element analysis
- Immiscible alloys
- Impact welding
- Interface microstructure
- Molecular dynamics simulation