TZM alloy is one of the most important molybdenum (Mo) based alloy which has a nominal composition containing 0.5-0.8 wt.% titanium (Ti), 0.08-0.1 wt.% zirconium (Zr) and 0.016-0.02 wt.% 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 05 wt.% B4C were prepared by spark plasma sintering (SPS) at 1420 degrees C utilizing 40 MPa pressure for 5 min under vacuum. The effects of B4C addition on oxidation, densification behavior, microstructure, and mechanical properties were investigated. The TZM alloy with 5 wt.% B4C have exhibited an approximately 66% reduction in mass loss under normal atmospheric conditions in oxidation tests made at 1000 degrees C for 60 min. And an increase from 1.9 GPa to 7.8 GPa has been determined in hardness of the alloy. (C) 2016 Elsevier Ltd. All rights reserved.