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tzm metal (Titanium Zirconium Molybdenum) is an established Molybdenum alloy that has much better high temperature strength than pure Molybdenum, and is more resistant to creep. It has a higher recrystallization temperature, is easier to weld, and offers twice the strength of pure moly at temperatures up to 1400 deg C.
Differential thermal analysis (DTA) revealed no compound formation between In and the primary constituents of TZM, suggesting that exposure to In did not cause any significant chemical reactions that would interfere with the precipitation hardening effects of the carbides in TZM. X-ray energy dispersive spectroscopy (EDS) line scans on the TZM-In interface also indicated no measurable diffusion of In into bulk TZM, supporting the conclusion that mechanical properties, including yield strength, ultimate tensile strength and total elongation, were not affected by exposure to In.
Polished cross-sections of the TZM samples post exposure to In showed typical elongated grain sizes in the longitudinal direction and smaller grains with needle-like characteristics in the transverse direction. The elongated grains were also characterized by large amounts of carbide formation, with the most prominent being TiC and ZrC at the grain boundaries.
Tensile tests of the TZM samples exposed to In were performed by Westmoreland Mechanical Testing & Research Inc at temperatures ranging from -196 degC to 800 degC, and compared to unexposed reference TZM specimens. Observed ductile to brittle transition temperatures (DBTTs) were at the low strain rate expected for TZM, and did not differ significantly between In-exposed and unexposed samples.