The influence of heat treatment on point defect concentration in Fe-Al and Fe-Al-Cr systems

• Autorzy: Kansy J. , Hanc A. , Giebel D.
• Języki publikacji: EN

Abstrakty

EN

FeAl alloys of nominal Al content 28, 38 and 45 at.% and Fe28Al5Cr with minor alloying elements added to improve their application properties are studied by positron annihilation lifetime analysis. The lifetime spectra of samples FeXAl with X greater-than or equal to 38 (both quenched and cooled with furnace) are described by a single lifetime component related to the saturated positron trapping by quenched-in vacancies of concentration much higher than 100 ppm. A very strong dependence of retained vacancy concentration on the rate of cooling is shown for Fe28Al and Fe28Al5Cr alloys. After quenching, the concentration is of the order of 10.4 whereas in samples slowly cooled it is reduced to 10.5. The chromium addition to Fe28Al5Cr dismisses the vacancies concentration in comparison to the concentration in Fe28Al after the same heat treatment.

Słowa kluczowe

EN

positron annihilation; Fe-Al; Fe-Al-Cr; point defects

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2010
• Tom: Vol. 55, No. 1
• Strony: 21--25
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Kansy J.

autor

Hanc A.

autor

Giebel D.

• Institute of Material Science, University of Silesia, 12 Bankowa Str., 40-007 Katowice, Poland, Tel.: [phone], Fax: [phone],

Bibliografia

• 1. Diego N de, Plazaola F, Jimenez JA, Serna J, Rio J del (2005) A positron study of the defect structures in the D03 and B2 phases in the Fe-Al system. Acta Materialia 53:163–172
• 2. Hamana D, Amiour L, Bouchear M (2008) Effect of chromium ternary additions on the ordering behaviour in Fe-28 at.% Al alloy. Materials Chemistry and Physics 112:816–822
• 3. Jiraskova Y, Schneeweiss O, Šob M, Novotny I (1997) Defect and atomic ordering studies in highly deformed and disordered Fe72Al28 alloy. Acta Metallurgica 45:2147–2154
• 4. Jordan JL, Deevi SC (2003) Vacancy formation and effects in FeAl. Intermetallics 11:507–528
• 5. Kansy J (1996) Microcomputer program for analysis of positron annihilation lifetime spectra. Nucl Instrum Methods Phys Res A 374:235–244
• 6. Kansy J, Giebel D (2010) Study of defect structure with new software for numerical analysis of PAL spectra. J Phys: Conf Series (in press)
• 7. Kansy J, Hanc A, Pająk L, Giebel D (2009) PALS study of point defects in Fe-Al and Fe-Al-Cr alloys. Phys Status Solidi C 6;11:2326–2328
• 8. Kubaschewski O (1982) Iron-binary phase diagrams. Springer-Verlag, Berlin
• 9. Melikhova O, Čižek J, Kuriplach J et al. (2010) Positron annihilation study of vacancies in Fe-Al based alloys. J Phys: Conf Series (in press)
• 10. Morris DG, Munoz-Morris MA (2005) The stress anomaly in FeAl-Fe3Al alloys. Intermetallics 13:1269–1274
• 11. Schaefer HE, Wurschum R, Šob M et al. (1990) Thermal vacancies and positron-lifetime measurements in Fe76.3Al23.7. Phys Rev B 41:11869–11874