Microstructure and properties of W-4.9Ni-2.1Fe heavy alloy with Dy₂O₃ addition

【摘要】 The W-4.9 Ni-2.1 Fe-xDy₂ O₃ 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 Dy₂ O₃ 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 Dy₂ O₃ addition can make the inhibition effect weaken,resulting in the decrease in the comprehensive performances of the alloy.So,the amount of Dy₂ O₃ should be appropriate.When the adding amount of Dy₂ O₃ particles is 0.7 wt%,the comprehensive performances of the heavy alloy are the best.更多还原

【Abstract】 The W-4.9 Ni-2.1 Fe-xDy₂ O₃ 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 Dy₂ O₃ 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 Dy₂ O₃ addition can make the inhibition effect weaken,resulting in the decrease in the comprehensive performances of the alloy.So,the amount of Dy₂ O₃ should be appropriate.When the adding amount of Dy₂ O₃ particles is 0.7 wt%,the comprehensive performances of the heavy alloy are the best.更多还原