The directional recrystallization behaviour of mechanically alloyed oxide dispersion-strengthened nickel- and iron-base alloys, MA760 and MA956, has been investigated by annealing in a moving temperature gradient (zone or laser annealing). The directional microstructure produced in MA760 was found to become more isotropic as the zone-annealing speed was increased. At the same time, the recrystallization front tended to become irregular with some nucleation occurring ahead of the main front as the zone-annealing speed exceeded the grain-boundary velocity. These data have been analysed theoretically. Laser-induced recrystallization has also been explored, as another method of annealing a sample in a moving temperature gradient. In the case of the iron-base MA956 alloy, recrystallization occurred directionally along the bar extrusion direction, irrespective of the laser zone-annealing direction.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
J. J. DeBarbadillo and J. J. Fischer, in “Metals Handbook”, 10th Edn, Vol. 2 (American Society for Metals, Materials Park, OH, 1990) p. 943.
M. M. Baloch and H. K. D. H. Bhadeshia, Mater. Sci. Technol. 6 (1992) 1236.
W. Sha and H. K. D. H. Bhadeshia, Metall. Mater. Trans. 25A (1994) 705.
T. S. Chou, H. K. D. H. Bhadeshia, Metall. Trans. 24A (1993) 773.
T. S. Chou, H. K. D. H. Bhadeshia, G. McColvin and I. C. Elliott, in “Proceedings of the 2nd International Conference on Structural Applications of Mechanical Alloying”, Vancouver, British Columbia, September 1993 (ASM International, Materials Park, OH, (1993) p. 77.
C. P. Jongenburger and R. F. Singer, in “New Materials by Mechanical Alloying Techniques”, edited by E. Arzt and L. Schultz (Deutsche Gesellschaft für Materialkunde, Oberursel, 1989) p. 157.
J. W. Christian, “The Theory of Transformations in Metals and Alloys: Equilibrium and General Kinetic Theory”, 2nd Edn (Pergamon, Oxford, 1975) p. 479.
W. Sha and H. K. D. H. Bhadeshia, unpublished research, Cambridge University (1993).
“Selected Powder Diffraction Data for Metals and Alloys”, 1st Edn, Vol. 1, edited by S. Weissmann, B. Post, M. E. Morse and H. F. McMurdie (JCPDS-International Centre for Diffraction Data, Swarthmore, PA, 1978) p. 91.
J. W. Christian, “The Theory of Transformations in Metals and Alloys: Equilibrium and General Kinetic Theory”, 2nd Edn (Pergamon, Oxford, 1975) pp. 413, 441.
D. R. Lide (ed.) “CRC Handbook of Chemistry and Physics”, 57th Edn (CRC Press, Boca Raton, FL, 1993) p. 12–149.
K. Murakami, K. Mino, H. Harada and H. K. D. H. Bhadeshia, Metall. Trans. 24A (1993) 1049.
M. J. Gore, M. Grujicic, G. B. Olson and M. Cohen, Acta Metall. 37 (1989) 2849.
M. M. Baloch, PhD thesis, Cambridge University (1989).
About this article
Cite this article
Sha, W., Bhadeshia, H.K.D.H. Directional recrystallization in mechanically alloyed oxide dispersion-strengthened metals by annealing in a moving temperature gradient. Journal of Materials Science 30, 1439–1444 (1995). https://doi.org/10.1007/BF00375245