2002 Volume 43 Issue 3 Pages 352-354
Mechanical alloying and pulse discharge sintering (MA-PDS) process was employed to fabricate MoSi2 alloys with additions of Al, B or Nb alloy elements. Microstructure and mechanical properties of these alloys were investigated. An exothermic behavior was identified during milling. This process is related to the reaction of each element to synthesize intermetallic MoSi2. The MoSi2 alloys fabricated by MA-PDS process showed a very fine microstructure compared to that sintered from the commercial MoSi2 alloy powders. Significant hardness increase was found due to the refinement of the binary MoSi2 microstructure. Alloys made from powders milled in air show higher hardness compared to those in Ar gas. This was because of the oxides formed during milling process.