Microstructure, mechanical properties, and corrosion resistance of an explosively welded Mg–Al composite

The extraordinary combination of strength and ductility of multilayered materials makes them attractive in the various applications and industries (military, aerospace, energy industry etc.). In the present work, the investigated materials were joined into multilayered sheet using the explosive welding method. The three-layer material was made of two titanium sheets and one Armco iron sheet in between. Materials produced by explosive welding can easily be used in a simple deformation process, but more complex processes that employ a more complex mechanical state are still not sufficiently studied. The presented study analyzes the possibilities of using Ti - Armco - Ti sheet for the deep drawing process. For this purpose, the forming limit diagram (FLD) has been constructed and verified. FLD is one of the most important tools in the analysis of sheet metal forming processes. In the presented work the non-standard method (Erichsen test) coupled with Digital Image Correlation analysis was used. The obtained results confirmed that the method of producing the tested sheet and the morphology of the microstructure created have a direct impact on the deformation mechanisms. 

Application of the DIC System to Build a Forming Limit Diagram (FLD) of Multilayer Materials

Multilayered aluminum and titanium base composites reinforced with 18%Ni maraging steel sheets were fabricated using single-shot explosive welding technique. Explosive welding conditions for moderate bonding, such as collision velocity and the kinetic energy loss by each collision of multilayered plates, are calculated using finite difference analysis. The estimated conditions can be achieved regulating stand-off between plates and using the multilayered plates with almost the same mass per unit area. Both aluminum and titanium base composites aged after welding showed high tensile strength compared with the composites aged before welding. The ultimate tensile strength of each composite is discussed based on the rule of mixture.

M. Nishida

Papers

Fabrication of maraging steel base multilayered composites using single-shot explosive welding technique