| Abstract Scope |
Refractory alloys, such as TZM (0.5wt%Ti-0.08wt%Zr-Mo), have excellent properties that make them well-suited for radiation environments, including high temperature structural stability, strength, creep resistance and corrosion resistance. However, during the brazing process, TZM can be susceptible to surface oxidation, liquid metal embrittlement (LME), and intermetallic phase formation at the joint, leading to detrimental effects on the mechanical properties at the joint. To prevent LME in refractory alloys, the addition of nickel (Ni) in braze fillers has proven effective. Yet, conflicting studies suggest the presence of Ni in braze fillers may increase the susceptibility of the base material to LME at the brazed joint. This study investigates the effect of Ni in Au-based braze fillers on the joint quality between TZM and 304 stainless steel (SS). We compare various braze fillers to determine whether the presence of Ni prevents or induces LME in brazed TZM/SS joints. The mechanical properties of the joint region will be observed with lap shear testing and material properties will be characterized with SEM, EDS, and XRD. Prepared by LLNL under Contract DE-AC52-07NA27344, Release # LLNL-ABS-2005385 |