An icosahedral phase in annealed austenitic stainless steel?
- 1 March 1989
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 59 (3) , 131-139
- https://doi.org/10.1080/09500838908206334
Abstract
Austenitic 316L stainless steel alloys annealed at 550°C for 100 h present a few ferrite precipitates surrounded by a new interfacial phase, here called the I-phase, that develops at the level of the austenite/ferrite interface. The I-phase presents the typical patterns of an icosahedral quasicrystal with a primitive hypercubic lattice of parameter A = 0.63 nm. The marked orientation relationships between the I-phase and the ferrite precipitates strongly suggest that this phase results from a decomposition of the ferrite and not of the austenite. The I-phase is metastable and transforms eventually after annealing at 700°C to the stable crystalline σ-phase.Keywords
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