Diffusion of ⁶³Ni in severely deformed ultrafine grained Cu-based alloys

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• 作者：P.B. Straumal^a ; ^b ; ^c ; ^{straumal.peter@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; M. Wegner^a ; D.V. Shangina^b ; ^c ; O.A. Kogtenkova^d ; A. Kilmametov^e ; S.V. Divinski^a ; ^{divin@wwu.de" class="auth_mail" title="E-mail the corresponding author} ; S.V. Dobatkin^b ; ^c ; G. Wilde^a
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：141-145
• 全文大小：819 K

文摘

Cu-Hf and Cu-Cr-Hf alloys have been subjected to severe plastic deformation applying equal channel angular pressing and high pressure torsion. Grain boundary diffusion was measured in a temperature interval between 423 K and 570 K using the radiotracer technique with the ⁶³Ni isotope as tracer. The microstructure evolution examination using scanning electron microscopy showed no structural changes during diffusion annealing. Diffusion profiles in pressed samples reveal the occurrence of a percolating porosity, whereas no such porosity could be detected in the twisted samples. The determined diffusion coefficients correspond to those in severely plastically deformed Cu alloyed with Pb or Zr.