A Study of Defects in Iron Based Alloys by Positron Annihilation Techniques

K.M. Mostafa a, b, J. De Baerdemaeker a, D. Segers a, P.R. Calvillo b, N. Van Caenegem b and Y. Houbaert b a Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, 9000 Ghent, Belgium b Department of Metallurgy and Materials Sci., Ghent University, Technologiepark 903, 9052 Ghent, Belgium

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Received: 3 09 2007 ;

Defects in different iron based alloys were studied at room temperature using positron annihilation techniques. In FeSi alloys, it was found that the Si content and the deformation temperature affect the positron annihilation parameters. In Fe-Mn-Si-Cr-Ni-C samples with different deformations, positron lifetime measurements were carried out before and after isochronal annealing. X-ray diffraction gave information about the different microstructural phases that exist in the deformed alloys before and after annealing. During deformation a martensitic εphase is induced. At 500°C, defects and the εmartensite phase were almost annealed out from the low deformed samples.

DOI: 10.12693/APhysPolA.113.1471 PACS numbers: 78.70.Bj, 62.20.F-