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Ni radiotracer diffusion in B2 ordered NiFeAl alloys

S. Divinski ; F. Hisker ; W. Löser ; Ulf Södervall (Institutionen för mikroteknologi och nanovetenskap) ; C. Herzig
Intermetallics (09669795 ). Vol. 14 (2006), 3, p. 308-314.
[Artikel, refereegranskad vetenskaplig]

Ni bulk diffusion was measured in the B2 ordered NiFeAl alloys with a constant Al content of approximately 50 at.%. The 63Ni radioisotope in combination with the radiotracer serial sectioning technique was applied at higher temperatures and the secondary ion mass spectrometry (64Ni isotope) was used in a low temperature range. Arrhenius-type temperature dependencies were established for all studied compositions in the temperature interval from 1050 to 1500 K. As the Fe content x in the Ni 50-xFexAl50 ternary alloys increases, the Ni diffusivity generally increases along the quasi-binary section between stoichiometric NiAl and FeAl. The activation enthalpy Q of Ni diffusion changes strongly non-monotonically in the ternary alloys between the binary end-members NiAl and FeAl revealing a pronounced minimum at the Ni40Fe 10Al50 composition and a conspicuous maximum around the Ni25Fe25Al50 composition. © 2005 Elsevier Ltd. All rights reserved.

Denna post skapades 2009-11-24.
CPL Pubid: 102098


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Institutionen för mikroteknologi och nanovetenskap



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