Abstract
TZM alloy is one of the most important molybdenum (Mo) based alloy which has a nominal composition containing 0.5–0.8wt.% titanium (Ti), 0.08–0.1wt.% zirconium (Zr) and 0.016–0.02wt.% carbon (C). It is a possible candidate for high temperature applications in a variety of industries. However, the rapid oxidation of TZM alloys at high temperature in air is considered to be one of the drawback. In this study, TZM alloys with additions of 0–5wt.% B4C were prepared by spark plasma sintering (SPS) at 1420°C utilizing 40MPa pressure for 5min under vacuum. The effects of B4C addition on oxidation, densification behavior, microstructure, and mechanical properties were investigated. The TZM alloy with 5wt.% B4C have exhibited an approximately 66% reduction in mass loss under normal atmospheric conditions in oxidation tests made at 1000°C for 60min. And an increase from 1.9GPa to 7.8GPa has been determined in hardness of the alloy.
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