Results in Materials (Mar 2021)
Effective joining between oxide dispersion strengthened tungsten-based material (ODS-W) and TZM alloy via spark plasma sintering technology
Abstract
In this work, the effective connection between oxide dispersion strengthened tungsten-based material (ODS-W) and TZM alloy has been realized via spark plasma sintering technology. The appropriate processing parameters have been investigated, and the joints were analyzed through scanning electron microscopy, microhardness measurement, X-ray diffractometry, and TEM test. Results show that, at 1500 °C, the interface presented good metallurgical bonding and no obvious defects, the diffusion distance between ODS-W/TZM alloy is the longest, and the mutual diffusion distance from molybdenum to tungsten is 2.2 μm. When yttrium oxide particles exist in the joint, the diffusion distance between them increases. The hardness of the ODS-W/TZM alloy joint can reach approximately 411 HV. The tensile strength of the joints was as high as 485 MPa. Transmission electron microscope photos show that when yttrium oxide particles exist at the interface, the mutual diffusion distance between tungsten and molybdenum is approximately 400 nm.
