Positron Annihilation and XRD Studies on Deformed Al-Alloys with low concentration of Mg

Emad BADAWI; M. A. ABDEL-RAHMAN; S. A. MAHMOUD

Makale detayları

Positron Annihilation and XRD Studies on Deformed Al-Alloys with low concentration of Mg

Yazarlar:

Emad BADAWI | M. A. ABDEL-RAHMAN | S. A. MAHMOUD

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2000 Vol.24 Issue 4, pp.543-550

Belge Tipi:

Makale

Yayın Tarihi:

3/2000

Belge Dili:

Türkçe

Document ID (Org No.):

2000762631

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

Positron behaviour at grain boundaries is characterized by their bulk diffusibility D, their bulk free lifetime tf and their trapped lifetime tt (tt > tf). Al-Mgx samples (x = 0-1.4 at %) have been homogenized at 573 K for 12 hours. The mean lifetime, as (indirectly) measured at various concentrations, show a good fitting with Sigmodel giving tt = 180.664 ps and tf = 163.9 ps. The mean lifetime was found to vary exponentially with the degree of deformation. The XRD study showed that preferred orientation occurred at degrees of deformation > 32 %, whereas the peak intensity then increases with sample deformation. Heat treatment (recrystallization) is also followed by XRD study. The peak intensities decrease with increasing annealing time (attributed to recrystallization), but it does not completely reverse to the condition origin. For all cases, no peaks of Mg were revealed indicating the positron annihilation as a sensitive technique for detecting low concentrations in alloys.

 

Positron behaviour at grain boundaries is characterized by their bulk diffusibility D, their bulk free lifetime tf and their trapped lifetime tt (tt > tf). Al-Mgx samples (x = 0-1.4 at %) have been homogenized at 573 K for 12 hours. The mean lifetime, as (indirectly) measured at various concentrations, show a good fitting with Sigmodel giving tt = 180.664 ps and tf = 163.9 ps. The mean lifetime was found to vary exponentially with the degree of deformation. The XRD study showed that preferred orientation occurred at degrees of deformation > 32 %, whereas the peak intensity then increases with sample deformation. Heat treatment (recrystallization) is also followed by XRD study. The peak intensities decrease with increasing annealing time (attributed to recrystallization), but it does not completely reverse to the condition origin. For all cases, no peaks of Mg were revealed indicating the positron annihilation as a sensitive technique for detecting low concentrations in alloys.

Makale detayları

Positron Annihilation and XRD Studies on Deformed Al-Alloys with low concentration of Mg

Yazarlar:

Emad BADAWI | M. A. ABDEL-RAHMAN | S. A. MAHMOUD

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2000 Vol.24 Issue 4, pp.543-550

Belge Tipi:

Makale

Yayın Tarihi:

3/2000

Belge Dili:

Türkçe

Document ID (Org No.):

2000762631

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Turk. J. Phys.

24

(2000)

543-550. Full text: pdf Other articles published in the same issue: Turk. J. Phys.

vol.24

iss.4.

Sayı

Makale detayları

Positron Annihilation and XRD Studies on Deformed Al-Alloys with low concentration of Mg

Yazarlar: Emad BADAWI | M. A. ABDEL-RAHMAN | S. A. MAHMOUD

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2000 Vol.24 Issue 4, pp.543-550

Belge Tipi: Makale

Yayın Tarihi: 3/2000

Belge Dili: Türkçe

Document ID (Org No.): 2000762631

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Turk. J. Phys.

24

(2000)

543-550. Full text: pdf Other articles published in the same issue: Turk. J. Phys.

vol.24

iss.4.

Sayı

Yazarlar:

Emad BADAWI | M. A. ABDEL-RAHMAN | S. A. MAHMOUD

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2000 Vol.24 Issue 4, pp.543-550

Belge Tipi:

Makale

Yayın Tarihi:

3/2000

Belge Dili:

Türkçe

Document ID (Org No.):

2000762631

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101