Correlation of Mechanical Properties with Defect Structure in Commercial Pure Al and Al-Mn Alloys Studied by Positron Annihilation Spectroscopy


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The variations during isochronal annealing of cold-rolled commercial pure Al (1050) and Al-Mn (3004) has been investigated between room temperature (RT) and 823 K. The annealing stages have been identified as recovery, partial recrystallization, complete recrystallization and grain growth using positron annihilation lifetime (PAL) spectroscopy, Doppler broadening of annihilation radiation (DBAR) spectroscopy and Vickers microhardness (Hv) measurements. The retardation of complete recovery in Al-Mn alloys is due to the presence of vacancy-Mn complexes. A positive correlation has been found between positron annihilation parameters (τav & Snor) and mechanical properties (Hv) for the two alloys under investigation.



Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.




E. A.H. Gomaa et al., "Correlation of Mechanical Properties with Defect Structure in Commercial Pure Al and Al-Mn Alloys Studied by Positron Annihilation Spectroscopy", Materials Science Forum, Vols. 546-549, pp. 783-787, 2007

Online since:

May 2007




[1] A. Harrich, S. Jagsch, S. Riedler, W. Rosinger, American J. Undegroduate Research, Vol. 2 (2003) 13.

[2] A. Dupasquier, A. P. Mills (Eds. ), Positron Spectroscopy of Solids, North-Holland, Amsterdam, (1994).

[3] E. E. Abdel-Hady, A. Ashry, H. Ismail, S. El-Gamal, Applied Surface Science, 252 (2006) 3297.


[4] A. Dupasquier, R. Ferragut, M. M. Iglesias, C. E. Macchi, M. Massozza, P. Mengucci, G. Riontino, A. Somoza, Materials Science Forum, Vols. 442-446 (2004) 16.


[5] E. Gomaa, M. Mohsen, A. Taha, M. Mostafa, Mater. Sci. Eng. A362 (2003) 274-279.

[6] S. Mohammed, N. Mostafa, E. Gomaa and M. Mohsen, J. Materials Engineering and Performance, Vol. 12 (2003) 95.

[7] E. Gomaa, N. Mostafa, M. Mohsen, A. Taha, J. Materials Engineering and Performance, Vol. 12 (2003) 190.

[8] M. Mohsen, H. Ismail, A. Ashry, G. Brawer, S. Mohamed, Mater. Sci. Forum. Vols 363-365, (2001), 216.

[9] PATFIT package, (1989), Purchased from Riso. Nat. Lab. Denmark.

[10] P. Hautojarvi, ed.: Positron in Solids, in Topics in Current Physics. Vol. 12, Springer-Verlag, Berlin, Germany, (1979).

[11] 11 G.M. Hood and R. J. Schutlz, Can. J. Phys., Vol. 60, (1982), 1117-1124.

[12] 12 M. A. Abdel Rahman, E. A. Badawi, E. H. Hassan, G. A. Yahya, Mater. Sci. Forum 363-365 (2001) 173.

[13] A. Van Veen, A. C. Krauseman, H. Schut, P.E. Mijnarends, B. J. Kooi, J. T. M. De Hosson, Mater. Sci. Forum 255 - 257 (1997) 67.

[14] M. Abdl El Wahab, W. Arafa, J. Mater. Eng. Perform. 9 (2000) 355.

[15] K. Petersen, ( Studies of Non Equilibrium Defects in Metals), Positron Solid-State Physics, W. Brandt and A. Dupasquier, Ed., North Holland, Amsterdam, (1983) 29 -356.

[16] M. S. Abd El Keriem, M. Mohsen, M. H. Kalil, M. Abd El Wahab, A. S. Taha, J. Mater. Eng. Perform. 7 (1998) 676.