Tailoring the strengthening-toughening behavior of the MoSi2 film by doping trace solute Au

Qiu, Jianxun; Wang, Ganggang; Si, Yanxin; Wen, Mao; Huang, Hai‐Hua; Wang, Weiwei; Zhang, Shangzhou; Yang, Tong; Yang, Xiaoyang; Ren, Ping

doi:10.1016/j.surfcoat.2021.127858

Cited by 8 publications

(1 citation statement)

References 79 publications

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“…Figure 3(b) reveals that the state density in the crystal is primarily contributed by Nb 4d, Mo 4d, and Si 3p orbitals. Furthermore, some Nb 4d orbital antibonding states appear below the Fermi energy level, which reduces the energy gap between its bonding and antibonding states [34]. The presence of Nb can lower energy required for dislocation slip and enhance the ductility of the material.…”

Section: Results and Analysismentioning

confidence: 99%

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi₂ coatings fabricated via arc cladding

Wang,

Sun,

Zhang

et al. 2023

Mater. Res. Express

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MoSi2 is one of the most promising refractory metal silicide materials, but its further use as a structural material is limited by its drawbacks such as poor room-temperature toughness and low high-temperature strength. The work performed a comprehensive investigation combining first-principles calculations and arc cladding experiments to explore the effects of Nb and W doping on the mechanical properties and electronic structure of MoSi2 coatings. The first-principles calculations revealed that Nb addition improved the B/G value and Poisson's ratio of MoSi2, indicating enhanced ductility. W addition yields the opposite effect and led to a higher elastic modulus and improved hardness. Experimental results demonstrated that the arc-cladding MoSi2 coating mainly consisted of MoSi2 and Mo5Si3 phases with a dendritic microstructure. Upon doping with Nb and W, additional t-(Mo,Nb)Si2 and t-(Mo,W)Si2 phases were formed, which resulted in a denser and finer microstructure. Nb addition contributed to the solid-solution toughening of the coating, while W addition enhanced hardness but reduced toughness. Remarkably, the synergistic alloying of Nb and W significantly increased the hardness and fracture toughness of the coating by 30.7 and 70.7%, respectively, compared to pure MoSi2. The strengthening mechanism of the coating was attributed to solid-solution softening and fine-grain strengthening, while the crack extension mechanism involved the crack deflection and bridging. Furthermore, the coatings doped with 2% Nb and 4% W exhibited the lowest wear weight loss and superior wear resistance. The dominant wear mechanisms were oxidation wear and abrasive wear.

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Section: Results and Analysismentioning

confidence: 99%

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi₂ coatings fabricated via arc cladding

Wang,

Sun,

Zhang

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

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Hard-yet-tough Mo-Si-C protective films for simultaneous friction and wear performance enhancement

Yu,

Ma,

et al. 2024

Applied Surface Science

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The effect of trace solute Au atoms on the phase structure, mechanical and self-lubricating properties of MoSi2 films

Ren

Song

Kimura

et al. 2023

Ceramics International

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Tailoring the strengthening-toughening behavior of the MoSi2 film by doping trace solute Au

Cited by 8 publications

References 79 publications

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi₂ coatings fabricated via arc cladding

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi₂ coatings fabricated via arc cladding

Hard-yet-tough Mo-Si-C protective films for simultaneous friction and wear performance enhancement

The effect of trace solute Au atoms on the phase structure, mechanical and self-lubricating properties of MoSi2 films

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Tailoring the strengthening-toughening behavior of the MoSi2 film by doping trace solute Au

Cited by 8 publications

References 79 publications

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi2 coatings fabricated via arc cladding

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi2 coatings fabricated via arc cladding

Hard-yet-tough Mo-Si-C protective films for simultaneous friction and wear performance enhancement

The effect of trace solute Au atoms on the phase structure, mechanical and self-lubricating properties of MoSi2 films

Contact Info

Product

Resources

About

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi₂ coatings fabricated via arc cladding

Experimental investigation and first-principles calculations of Nb and W alloying effects on the microstructure and properties of MoSi₂ coatings fabricated via arc cladding