Lattice instability in the solid-state amorphization of Fe(Al) solid solutions by mechanical alloying

Sheng, H. W.; Zhao, Yaohua; Hu, Zheng; Lu, K.

doi:10.1103/physrevb.56.2302

Cited by 27 publications

(18 citation statements)

References 24 publications

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“…The XRD data obtained for the metastable phase do not coincide with those for other metastable phases reported so far, including Al m Fe [16,17], Al 9 Fe 2 and Al 6 Fe. Actually we found the metastable phase Al 6 Fe during the crystallization of amorphous phase in an Al-rich metastable alloy (Al 90 Fe 10 ). Further investigation on this issue by use of transmission electron microscopy is in progress.…”

Section: Discussionmentioning

confidence: 78%

The crystallization process of amorphous Al80Fe20 alloy powders prepared by ball milling

Zhou

Lück

Scheffer

et al. 1999

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 78%

The crystallization process of amorphous Al80Fe20 alloy powders prepared by ball milling

Zhou

Lück

Scheffer

et al. 1999

Journal of Non-Crystalline Solids

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“…Usually C 12 > 0, with intermediate-valent compounds such as Tm x Se (Boppart et al, 1980) and Sm x La 1Àx S (Schärer and Wachter, 1995) being exceptions. Further, it is convenient to work with the bulk modulus…”

Section: B Elastic Constants 1 Born Stability Criteriamentioning

confidence: 99%

“…See also Manna et al (2002Manna et al ( , 2003 for work on Ti and Zr. Sheng et al (1997) obtained amorphous Fe 1Àx Al x through ball milling and attributed it to a dynamical lattice instability. Finally, surface stress can play a significant role in structural changes in nanowires.…”

Section: Nanostructuresmentioning

confidence: 99%

Lattice instabilities in metallic elements

et al. 2012

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Most metallic elements have a crystal structure that is either body-centered cubic (bcc), facecentered close packed, or hexagonal close packed. If the bcc lattice is the thermodynamically most stable structure, the close-packed structures usually are dynamically unstable, i.e., have elastic constants violating the Born stability conditions or, more generally, have phonons with imaginary frequencies. Conversely, the bcc lattice tends to be dynamically unstable if the equilibrium structure is close packed. This striking regularity essentially went unnoticed until ab initio total-energy calculations in the 1990s became accurate enough to model dynamical properties of solids in hypothetical lattice structures. After a review of stability criteria, thermodynamic functions in the vicinity of an instability, Bain paths, and how instabilities may arise or disappear when pressure, temperature, and/or chemical composition is varied are discussed. The role of dynamical instabilities in the ideal strength of solids and in metallurgical phase diagrams is then considered, and comments are made on amorphization, melting, and low-dimensional systems. The review concludes with extensive references to theoretical work on the stability properties of metallic elements.

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“…For x>60, the behaviour is complex, with mixed bcc and fcc phases, supersaturated solid solutions of Fe in Al and amorphous phases having been reported [4][5][6]. In recent years, a number of studies have been reported on the formation of metastable phases in mechanically alloyed Fe-Al systems of various compositions.…”

Section: Introductionmentioning

confidence: 97%

Mössbauer study of incompletely alloyed nanocrystalline Fe100 − x Al x prepared by high energy ball milling

2007

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Mechanically alloyed Fe 100−x Al x powders, with 20≤x≤90, have been studied by X-ray diffraction and room temperature 57 Fe Mössbauer spectroscopy. The milling time was chosen such that complete alloying does not take place. For a fixed milling time of 10 h, the rate of alloying was seen to increase exponentially with increase in Fe content. Mössbauer spectra of all the samples consist of a broad magnetic sextet and a quadrupole doublet. The isomer shifts and quadrupole splitting of the doublets are typical of Al-rich, Fe-Al alloys. The area under the quadrupole doublet is a maximum for x=66. Analysis of the Mössbauer spectra indicates the formation off-stoichiometric Fe 3 Al phase for x<66, while the formation of Fe clusters is largely responsible for the magnetic hyperfine component in x≥66 compositions.

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Lattice instability in the solid-state amorphization of Fe(Al) solid solutions by mechanical alloying

Cited by 27 publications

References 24 publications

The crystallization process of amorphous Al80Fe20 alloy powders prepared by ball milling

The crystallization process of amorphous Al80Fe20 alloy powders prepared by ball milling

Lattice instabilities in metallic elements

Mössbauer study of incompletely alloyed nanocrystalline Fe100 − x Al x prepared by high energy ball milling

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