Participation of helium in discontinuous transformations in metallic alloys
Authors: Pawłowski, A.; Shmatko, O. A.; Zięba, P.
Source: Materials Science and Technology, Volume 8, Number 8, August 1992 , pp. 716-721(6)
Publisher: Maney Publishing
Abstract:The influence of helium on the diffusion at a migrating boundary has been investigated during discontinuous precipitation in a Co–14 at.-%Al alloy and during discontinuous dissolution in an Al–15 at.-%Zn alloy. The helium was introduced into the alloys via a plasma treatment using various fluxes. Two opposing processes have been observed depending on the flux. One, below a critical flux, led to an increase in the linear growth rate of discontinuous precipitation and discontinuous dissolution owing to an enhanced concentration of vacancies, which acted as carriers of solute atoms in the diffusion process. The other process, above the critical flux, resulted in the appearance of helium bubbles, which acted as mechanical obstacles to the moving discontinuous precipitation and discontinuous dissolution front and as sinks for the excess vacancies. The effect of helium on the diffusion ahead of the advancing front during discontinuous precipitation and discontinuous dissolution has been well described using a parameter Db Al or Zn/DV He proposed by the authors.
Document Type: Research Article
Publication date: 1992-08-01
Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.Materials Science and Technology is the successor of two previous titles, for which digitised archives are available: Metal Science (Vols. 1—17; 1967—84) and Metals Technology (Vols. 1—11; 1974—84).
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