Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 94, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2020.105383
Keywords
Hot explosive welding; Mo/cu bimetal; Microstructure; Interfacial shear strength
Funding
- National Natural Science Foundation of China [11402026, 11521062]
- opening project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology) [QNKT17-01, ZDKT18-01]
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In this study, a 5 mm thick Mo plate was successfully welded with Cu plate using hot explosive welding, achieving a maximum shear strength exceeding 295 MPa at the interface. Analyzing interfacial microstructures revealed differences in dislocation density and evolution of structure between Cu and Mo.
Due to the brittleness of molybdenum (Mo) and high difference in melting point, it is still a challenge to clad thick Mo onto copper (Cu) with high quality bonding. In this study, a 5 mm thick Mo plate was successfully welded with Cu plate by hot explosive welding, without any cracks being formed. The maximum shear strength of the interface exceeded 295 MPa. The calculated weldability window indicated that the welding was achieved with the parameters close to the lower boundary, and successfully predicted the wavy interfaces. The interfacial microstructures were investigated by scanning electron microscope, electron backscatter diffraction and transmission electron microscopy, the results showed that the dislocations in Cu were higher than the Mo side and the evolutions of interfacial structure due to severe deformation, such as misorientation angle, recrystallization and texture, were quite different for Mo and Cu.
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