S. E. Danilov

FORMATION OF INTERMETALLIC PARTICLES IN AN Fe-Ni-Al ALLOY DURING ANNEALING AND ELECTRON IRRADIATION

The behavior of intermetallic nanoparticles, such as Ni3Al, and vacancy defects in an fcc Fe-Ni-Al alloy during annealing and electron irradiation is studied by measuring residual resistivity. It is shown that, during annealing at early stages, Ni3Al zones are formed in the quenched Fe-Ni-Al alloy, which increase residual electrical resistance, and during annealing above 700 K, nanosized (~4.5 nm) intermetallic precipitates are formed from them, uniformly distributed in the alloy matrix, whose growth leads to a decrease in residual resistivity. Under irradiation at room temperature, vacancy defects accumulate in the alloy in the form of vacancy complexes. The dissociation of these complexes at about 400 K causes the appearance of freely migrating vacancies and enhances self-diffusion forming Ni3Al bands. At about 600 to 700 K, the solid solution is decomposed thermally. At higher temperatures, the formation of intermetallic particles occurs, which is characterized by a decrease in electrical resistance.

Acknowledgment: The research was performed under the state assignment, theme Function, No. 122021000035-6.

References:

1. Williams K.R., Fisher S.B. The void swelling of a γ′-hardened alloy. Radiation Effects, 1972, 15, pp. 243–250.
2. Johnston W.G., Rosolowsky J.H., Turkalo A.M., Lauritzen T. An experimental survey of swelling in commercial Fe-Cr-Ni alloys bombarded with 5 MeV Ni Ions. J. Nucl. Mater., 1974, 54 (1), pp. 24–40. DOI: 10.1016/0022-3115(74)90073-7.
3. Parshin A.M. Struktura, prochnost i radiatsionnaya povrezhdaemost korrozionno-stoykikh staley i splavov [Structure, strength and radiation damageability of corrosion-resistant steels and alloys]. Chelyabinsk, Metallurgiya Publ., 1988, 665 p. (In Russian).
4. Druzhkov A.P., Perminov D.A., Pecherkina N.L. Positron annihilation spectroscopy characterization of effect of intermetallic nanoparticles on accumulation and annealing of vacancy defects in electron-irradiated Fe-Ni-Al alloy. Philosophical Magazine, 2008, vol. 88, pp. 959–976. DOI: 10.1080/14786430802014670.
5. Wilson G., Pickering F.B. A study of zone formation in an austenitic steel containing 4% titanium. Acta Metallurgica, 1968, 16 (1), pp. 115–131. DOI: 10.1016/0001-6160(68)90080-1.
6. White R.J., Fisher S.B., Miller K.M., Swallow G.A. A resistometric study of ageing in nimonic alloys (I). PE16. J. Nucl. Mater., 1974, vol. 52 (1), pp. 51–58. DOI: 10.1016/0022-3115(74)90024-5.
7. Whelchel R.L., Kelekanjeri V.S.K.G., Gerhardt R.A. Mechanical and electrical characterisation in age hardened Waspaloy microstructures. International Heat Treatment & Surface Engineering, 2009, 3 (1), pp. 35–39. DOI: 10.1179/174951409X12450558152589.
8. Druzhkov A.P., Danilov S.E., Perminov D.A., & Arbuzov V.L. Formation and evolution of intermetallic nanoparticles and vacancy defects under irradiation in Fe−Ni−Al ageing alloy characterized by resistivity measurements and positron annihilation. Journal of Nuclear Materials, 2016, 476, pp. 168–178. DOI: 101016/jjnucmat201604045. 
9. Lifschitz I.M., Slyozov V.V. The Kinetics of Precipitation from Supersaturated Solid Solutions. J. Phys, Chem. Solids, 1961, vol. 19 (1–2), pp. 35–50. DOI: 10.1016/0022-3697(61)90054-3.
10. Kelekanjeri V.S.K.G., Moss L., Gerhardt R.A., Ilavsky J. Quantification of the coarsening kinetics of γ′ precipitates in Waspaloy microstructures with different prior homogenizing treatments. Acta Materialia, 2009, 57 (16), pp. 4658–4670. DOI: 10.1016/j.actamat.2009.06.019.
11. Arbuzov V.L., Druzhkov A.P., Danilov S.E. Effects of phosphorus on defects accumulation and annealing in electron-irradiated Fe–Ni austenitic alloys. Journal of Nuclear Materials, 2001, vol. 295 (1–2), pp. 273–280. DOI: 10.1016/S0022-3115(01)00505-0.
12. Dimitrov C., Dimitrov O., Dworschak F. The interaction of self interstitials with undersized solute atoms in electron-irradiated aluminium. Journal of Physics F: Metal Physics, 1978, 8, pp. 1031–1052. DOI: 10.1088/0305-4608/8/6/009.
13. Ardell A.J., Nicholson R.B., Eshelby J.D. On the modulated structure of aged Ni–Al alloys. Acta Metall., 1966, 14, pp. 1295–1309.
14. Hofer C., Stergar E., Maley S.A., Wang Y.Q., Hosemann P. An intermetallic forming steel under radiation for nuclear applications. J. Nucl. Mater., 2015, 458, pp. 361–368. DOI: 10.1016/S0022-3115(01)00505-0.

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