Journal ArticleDOI
Structure of chromium-rich Cr-Ni, Cr-Fe, Cr-Co, and Cr-Ni-Fe alloy particles made by evaporation in argon
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In this paper, the compositional ranges for the σ phase in the Cr-Ni, Cr-Fe, and Cr-Co systems are from low chromium to 68, 63.4, and 62.1 wt pct Cr, respectively.Abstract:
Structural analyses were performed on alloy particles of chromium-rich Cr-Ni, Cr-Fe, Cr-Co, and Cr-Ni-Fe systems. Fine alloy particles (100 to 1000A in diameter) were prepared by evaporation of parent alloys in argon at 20 torr. In addition, alloy structures of bulk specimens of the Cr-Ni system were investigated using X-ray diffraction techniques to confirm the results obtained from the particulate alloys. In these binary systems, δ phase with W3O structure (A-15) and a phase withβ-uranium structure (D
8
) were identified in addition to the α (bcc) and γ (fcc) terminal solid solutions. The compositional ranges for the σ phase in the Cr-Ni, Cr-Fe, and Cr-Co systems are from low chromium to 68, 63.4, and 62.1 wt pct Cr, respectively. The δ phase exists in the range from pure chromium to 68, 58, and 54 wt pct Cr in the respective Cr-Ni, Cr-Fe, and Cr-Co alloy systems. Similarly, in the Cr-Ni-Fe system, it was found that δ phase occurs in the chromium corner while σ phase exists in the region bridging the two binary σ phases of the Cr-Ni and Cr-Fe systems. Possible modification of phase diagrams of these systems is discussed in view of these results.read more
Citations
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Ultrafine metal particles
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Decomposition of the single-phase high-entropy alloy CrMnFeCoNi after prolonged anneals at intermediate temperatures
F. Otto,Antonín Dlouhý,Konda Gokuldoss Pradeep,Monika Kuběnová,Dierk Raabe,Gunther Eggeler,Easo P. George +6 more
TL;DR: In this article, the authors evaluated the phase stability of CrMnFeCoNi and showed that it is a single-phase solid solution after homogenization for 2 days at 1200°C and remains in this state after a subsequent anneal at 900°C for 500 days.
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Size effect on the crystal phase of cobalt fine particles
TL;DR: In this paper, the size dependence of the crystal phase of the Co fine particles was investigated, and it was shown that the stabilization of crystal phase is the intrinsic effect caused by the small dimensionality of fine particles.
Journal ArticleDOI
Phase Equilibria and Thermodynamic Properties in the Fe-Cr System
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References
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Journal ArticleDOI
An Electron Diffraction Study on the Crystal Structure of a New Modification of Chromium
Kazuo Kimoto,Isao Nishida +1 more
TL;DR: Kimoto et al. as mentioned in this paper showed that fine particles of chromium have the ordinary b.c.c structure when the argon contains a small amount of air or oxygen but they have a new structure when argon is pure, which is a disordered atomic arrangement derivable from the β-tungsten structure.
Journal ArticleDOI
On the Crystal Structures of Cr–Ni Alloy Particles by Evaporation in Argon Gas at Low Pressure
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