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The W-4.9Ni-2.1Fe alloy with different addition of Y2O3 was prepared by high energy ball milling and spark plasma sintering techniques, the microstructure, mechanical property, friction and wear behavior of the high density alloy were investigated by the Rockwell hardness tester, X-ray diffractometer, reciprocating friction and wear tester, 3D profiler, etc. The results show that adequate doping of the trace Y2O3 can effectively inhibit the grain size, promote the γ-(Ni,Fe) bonding phase and tungsten particles uniformly distribute, increase the relative density, hardness, friction and wear properties. But the excessive Y2O3 addition can easily aggregate at grain boundary, weaken the inhibition effect, and decrease the mechanical and wear properties of the alloy. So the addition of Y2O3 should be appropriate. When the adding mass fraction of Y2O3 particles is 0.4%, the comprehensive performance of the alloy is the best.

The W–4.9Ni–2.1Fe–xDy2O3 heavy alloy was fabricated by high-energy ball milling and spark plasma sintering (SPS) technique, and the microstructure, mechanical and friction behavior and anti-corrosion ability were investigated by scanning electron microscope (SEM), Rockwell hardness tester, X-ray diffraction (XRD), reciprocating friction and wear tester, electrochemical station, etc. The results show that the trace Dy2O3 particles, which mainly distributes in the W–M (tungsten-matrix) interface and the tungsten matrix phase, can dramatically decrease the tungsten grain size and the amount of O and P impurities aggregating in the interface, promote the γ-(Ni, Fe) bonding phase and tungsten particles uniform distribution, and increase the relative density, hardness, and wear and corrosion resistance properties. But the excessive Dy2O3 addition can make the inhibition effect weaken, resulting in the decrease in the comprehensive performances of the alloy. So, the amount of Dy2O3 should be appropriate. When the adding amount of Dy2O3 particles is 0.7 wt%, the comprehensive performances of the heavy alloy are the best. [ABSTRACT FROM AUTHOR]