The precipitation of faulted γ′ has been observed at dislocations introduced by deformation before ageing in austenitic steels with high Ti:A1 ratios. The dislocation reaction was identified by electron contrast analysis. It is proposed that co-nucleation of the ordered L12 γ′ phase and the DO24 η phase occurs upon matrix stacking faults. The strong dislocation pinning thus produced may provide a mechanism for further increasing alloy strength.
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References
1.
BilsbyC. F., “ The Microstructure and Deformation Behaviour of a Nitnonic Alloy ”,Ph.D. Thesis, Cambridge Univ., 1966.
2.
HornbogenE. and RothM., Z. Metallkunde, 1967, 58, 842.
3.
BeattieH. J. and HagelW. C., Trans. Amer. Inst. Min. Met. Eng., 1957, 209, 911.
4.
MerrickH. F. and NicholsonR. B., “Proceedings of the 5th International Congress on Electron Microscopy ”,Vol. I, K8. 1962: New York and London(Academic Press).
5.
ClarkB. R. and PickeringF. B., J. Iron Steel Inst., 1967, 205, 70.
6.
SilcockJ. M. and WilliamsN. T., ibid., 1966, 204, 1100.
7.
DulieuD. and AronssonB., Jernkontorets Ann., 1966, 150, (11), 787.
8.
KearB. H., GiameiA. F., SilcockJ. M., and HamR. K., Scripta Met., 1968, 2, 287.
9.
KearB. H., LeverantG. R., and OblakJ. M., Trans. Amer. Soc. Metals, 1969, 62, 639.
10.
RaynorD. and SilcockJ. M., Metal Sci. J., 1970, 4, 121.
11.
SilcockJ. M. and TunstallW. J., Phil. Mag., 1964, 10, 361.
12.
ThomasB. and HenryG., Mem. Sci. Rev. met., 1967, 64, 625.
13.
BeestonB. E. P. and FranceL. K., J. Inst. Metals, 1968, 96, 105.
14.
MarcinkowskiM. J., “Electron Microscopy and Strength of Crystals” (edited byThomasG. and WashburnJ.), Ch. 7, p. 333. 1963: New York and London(Interscience Pub-lishers).
