Abstract
Brittle MoFe intermetallic compounds (IMCs) are usually fatal for the joining of Mo and steel. In the present work, Ni-free joining of Mo and stainless steel was successfully achieved by laser welding with CuTi filler metal. The entry of Mo element into the weld seam and the formation of MoFe IMCs was significantly suppressed. TiFe, TiFe2, Ti5Cr8Fe16, and Cu-Ti-Fe phases were found inside the weld and near the interface. The IMCs were separated by Cu matrix and no continuous layered IMCs were found. The brittle fracture characteristics of TiFe IMCs and plastic deformation of the Cu matrix was found on the fracture surface in the weld.
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