期刊
METALS
卷 9, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/met9090992
关键词
tungsten heavy alloy; high-entropy alloy; microwave sintering; spark plasma sintering; compressive strength
资金
- Estonian Research Council through the MOBERC15 project
Tungsten heavy alloy composite was developed by using novel CoCrFeMnNi high-entropy alloy as the binder/reinforcement phase. Elemental tungsten (W) powder and mechanically alloyed CoCrFeMnNi high-entropy alloy were mixed gently in high energy ball mill and consolidated using different sintering process with varying heating rate (in trend of conventional sintering < microwave sintering < spark plasma sintering). Mechanically alloyed CoCrFeMnNi high-entropy alloy have shown a predominant face-centered cubic (fcc) phase with minor Cr-rich sigma-phase. Consolidated tungsten heavy high-entropy alloys (WHHEA) composites reveal the presence of Cr-Mn-rich oxide phase in addition to W-grains and high-entropy alloys (HEA) phase. An increase in heating rate restricts the tungsten grain growth with reduces the volume fraction of the Cr-Mn-rich phase. Finally, spark plasma sintering with a higher heating rate and shorter sintering time has revealed higher compressive strength (similar to 2041 MPa) than the other two competitors (microwave sintering: similar to 1962 MPa and conventional sintering: similar to 1758 MPa), which may be attributed to finer W-grains and reduced fraction of Cr-Mn rich oxide phase.
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