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Strain-enhanced sintering of iron powders

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Abstract

Sintering of ball-milled and un-milled Fe powders has been investigated using dilatometry, X-ray, density, and positron annihilation techniques. A considerable sintering enhancement is found in milled powders showing apparent activation energies that range between 0.44 and 0.80 eV/at. The positron annihilation results, combined with the evolution of the shrinkage rate with sintering temperature, indicate generation of lattice defects during the sintering process of milled and un-milled powders. The sintering enhancement is attributed to pipe diffusion along the core of moving dislocations in the presence of the vacancy excess produced by plastic deformation. Positron annihilation results do not reveal the presence of sintering-induced defects in un-milled powders sintered above 1200 K, the apparent activation energy being in good agreement with that for grain-boundary diffusion in γ-Fe.

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Authors and Affiliations

  1. Departamento de Ciencias de Materiales e Ingeniería Metalúrgica, Universidad Carlos III de Madrid, 28911, Leganés, Madrid, Spain

    D.R. Amador & J.M. Torralba

  2. Departamento de Física, Universidad Carlos III de Madrid, Avd. Universidad 30, 28911, Leganés, Madrid, Spain

    M.A. Monge & R. Pareja

Authors
  1. D.R. Amador
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  2. M.A. Monge
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  3. J.M. Torralba
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  4. R. Pareja
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Correspondence to M.A. Monge.

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PACS

81.20.Ev; 81.20.Wk; 78.70.Bj

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Amador, D., Monge, M., Torralba, J. et al. Strain-enhanced sintering of iron powders. Appl. Phys. A 80, 803–811 (2005). https://doi.org/10.1007/s00339-004-2546-9

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