Metastable phases induced by ion irradiation in the equilibrium immiscible Fe-Cu system
Journal of Applied Physics, ISSN: 0021-8979, Vol: 87, Issue: 10, Page: 7232-7241
2000
- 9Citations
- 7Captures
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Article Description
Anomalous structural evolution was induced by room-temperature 200 keV xenon ion irradiation and it results in the formation of various new metastable phases in the equilibrium immiscible Fe-Cu system. First, nanosized quasicrystals were formed in an amorphous matrix through a two-step transition of crystal to amorphous to quasicrystal in FeCu multilayered films. The real compositions of the amorphous matrix and quasicrystals were determined to be close to FeCu and FeCu, respectively. Moreover, the same icosahedral phase was also obtained in another similarly designed FeCu multilayered sample upon 850°C thermal annealing, confirming the existence of such a metastable state. Second, amorphous alloys were formed in a composition range of 30-50 at. % of Cu. Third, a Cu-based face-centered-cubic (fcc) solid solution was formed at an alloy composition of about FeCu and, interestingly, another fcc structured metastable crystalline phase was obtained at a composition very close to that of FeCu. A Gibbs free energy diagram of the Fe-Cu system was calculated, with special consideration of excess interfacial free energy stored in the multilayered films, within the framework of Miedema's model and it gives a reasonable thermodynamic explanation to the metastable phase formation observed. The amorphous-to-quasicrystal transition is also discussed in terms of the similarity in the atomic configuration between the icosahedral and amorphous short-range orders. Furthermore, molecular dynamics study showed that Fe and Cu could be mixed on an atomic scale in the metastable phases observed. © 2000 American Institute of Physics.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0001262073&origin=inward; http://dx.doi.org/10.1063/1.372974; https://pubs.aip.org/jap/article/87/10/7232/288723/Metastable-phases-induced-by-ion-irradiation-in; http://aip.scitation.org/doi/10.1063/1.372974; https://aip.scitation.org/action/captchaChallenge?redirectUrl=https%3A%2F%2Faip.scitation.org%2Fdoi%2F10.1063%2F1.372974
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