AlMg6–AlMg6 weld interface: microstructure and mechanical properties after explosive welding
Year: 2023
Type: article
Abstract: Due to their low density, high strength, and resistance to corrosion, Al-Mg alloys are widely used in the railcar construction and shipbuilding, and other industries. The aim of this study was to carry out a detailed analysis of the microstructure of the AlMg6-AlMg6 weld interface after explosive welding (EW). The results of this study are important for a better understanding of the joint formation process in EW of AlMg6 with other metals and alloys. The study included optical and electron microscopy of metallographic specimens with etched surfaces. Vickers hardness tests and tear strength tests were carried out to determine the mechanical properties of the joint. Optical and electron microscopy revealed a large number of adiabatic shear bands (ASBs) formed during EW and dark-etching structures formed after etching. An increase in explosive welding parameters leads to an increase in ASBs in the flyer plate and parent plate. The dark-etching structures are most likely the accumulations of structural defects and intermetallic compound fragments. The tear testing of the weld joint showed that higher EW parameters lead to much higher tear strength with a non-uniform distribution along the length of the plates. It was concluded that in order to achieve a joint between AlMg6 and other alloys and metals with the highest strength, plastic deformation in the weld interface must be sufficiently high, while heating must be minimal. The maximum joint strength was 150 MPa in mode 2 and 242 MPa in mode 3, respectively.
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409813360