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Defect Study on Deformed Fe-Si Alloys by Positron Annihilation Techniques

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Chou K., De Baerdemaeker J., Peral V., Ruiz D., Houbaert Y., Segers D.

Acta Physica Polonica A

2005

vol. 107

issue 5

799-804

A set of Fe-Si samples with different Si content, varying from 0 to 7.6 wt.%, was investigated using positron annihilation spectroscopy. Different deformations were performed on these samples and the lineshape parameters of the annihilation line were measured in order to investigate the defects in the alloys. An exponential decay of the S-parameter in function of the time can be observed after deformation of the samples. The decay constant increases with increasing Si content. During the measurements of the samples with increasing Si content, the initiation of DO_3 structure can be seen above 5 wt.% of Si, as well as the decoration by impurities.

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

100%

Mostafa K., De Baerdemaeker J., Segers D., Calvillo P., Van Caenegem N., Houbaert Y.

Acta Physica Polonica A

2008

vol. 113

issue 5

1471-1478

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 martensiticεphase is induced. At 500°C, defects and theεmartensite phase were almost annealed out from the low deformed samples.

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2 Acta Physica Polonica A

1 2008

1 2005

2 De Baerdemaeker J.

2 Houbaert Y.

2 Segers D.

1 Calvillo P.

1 Chou K.

1 Mostafa K.

1 Peral V.

1 Ruiz D.

1 Van Caenegem N.

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Defect Study on Deformed Fe-Si Alloys by Positron Annihilation Techniques

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