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Effect of nano Y2O3 dispersion on thermal, microstructure, mechanical and high temperature oxidation behavior of mechanically alloyed W-Ni-Mo-Ti

Patra, A. ; Sahoo, R.R. ; Karak, S.K. ; Sahoo, S.K.

International journal of refractory metals & hard materials, 2018-01, Vol.70, p.134-154 [Periódico revisado por pares]

Shrewsbury: Elsevier Ltd

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  • Título:
    Effect of nano Y2O3 dispersion on thermal, microstructure, mechanical and high temperature oxidation behavior of mechanically alloyed W-Ni-Mo-Ti
  • Autor: Patra, A. ; Sahoo, R.R. ; Karak, S.K. ; Sahoo, S.K.
  • Assuntos: Alloy powders ; Alloys ; Compressive strength ; Dislocation density ; Dispersion ; Ductility ; Effects ; Electron microscopy ; Elongation ; Energy transmission ; Hardness ; High temperature ; Lattice strain ; Mechanical alloying ; Microstructure ; Oxidation ; Oxidation resistance ; Oxide dispersion strengthening ; Recrystallization ; Residual stress ; Sintering (powder metallurgy) ; Strength ; Tungsten base alloys ; W-Ni-Mo-Ti alloy ; X-ray diffraction ; Yttrium oxide
  • É parte de: International journal of refractory metals & hard materials, 2018-01, Vol.70, p.134-154
  • Descrição: The present research deals with the fabrication of mechanically alloyed W based alloys with nominal composition of W75Ni10Mo10Ti5 (alloy A), W74Ni10Mo10Ti5(Y2O3)1 (alloy B), W73Ni10Mo10Ti5(Y2O3)2 (alloy C) (all in wt%) by compaction at 500MPa pressure for 5min and conventional pressureless Ar injected sintering at 1500°C for 2h. The phase evolution, microstructure, thermal characteristics, mechanical and high temperature behavior of the mechanically alloyed powders and sintered alloys has been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), energy dispersive spectroscopy (EDS) and differential scanning calorimetry (DSC). Alloy C shows minimum crystallite size and maximum lattice strain, dislocation density of 18.6nm, 0.54%, 36.71×1016/m2 respectively at 20h of milling as compared to other alloys. The activation energy for recrystallization decreases with increase in Y2O3 dispersion. The residual stress also enhances with increased Y2O3 content. Alloy C exhibits improved relative sintered density, hardness and elongation of 92.1%, 7.22GPa, 12.73% respectively and appreciable wear resistance, high temperature oxidation resistance at 1000°C whereas maximum compressive strength of 1.91GPa has been recorded in alloy B as compared to other alloys. Most interestingly the ductility also enhances with increase in Y2O3 dispersion. [Display omitted] •Nanostructured W-Ni-Mo-Ti-(0, 1, 2wt% Y2O3) alloys are fabricated by mechanical alloying and conventional sintering.•Increase in Y2O3 dispersion considerably reduces the activation energy for recrystallization.•Enhanced grain bimodality is achieved in W-Ni-Mo-Ti-2wt% Y2O3 alloy.•The density, hardness, wear resistance and ductility increase and strength decreases with increase in Y2O3 addition.•W-Ni-Mo-Ti-2wt% Y2O3 alloy exhibits superior resistance against oxidation at 1000°C as compared other alloys.
  • Editor: Shrewsbury: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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