Crystallization behavior of Al100 − xSmx (x = 8–14 at%) amorphous alloys

Guo, Jing; Ohtera, Katsumasa; Kita, Kazuhiko; Nagahora, J.; Kazama, Noriaki

doi:10.1016/0167-577x(95)00066-6

Cited by 18 publications

(33 citation statements)

References 6 publications

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“…Reported experimental data indicate that the b fi a + L reaction occurs between 1328 and 1351 K. [14,15,20] Here the lower limit of the indicated range is selected, and it is assumed that the b fi a + L invariant temperature is 1328 K. With this temperature, the parameter b a is evaluated as listed in Table V. For the Al 4 Sm-c phase, it is assumed that b c = 0, and a c is evaluated from the reported b fi c transition temperature of 873 K [9,10] (Table V).…”

Section: A Model Formulationmentioning

confidence: 99%

“…From Eq. [9], the molar enthalpy and entropy of mixing for the system are computed as [35] Parameter [4][5][6], the ratio of mole numbers is given by…”

Section: A Model Formulationmentioning

confidence: 99%

“…[9][10][11] By virtue of these features, it is clear that the binary Al-Sm system is one in which the metastable phases play a major role in the various solidification and devitrification phenomena. As such, accurate thermodynamic treatments of equilibrium and metastable phases are required to use this system as a model for the investigation of fundamental competition and selection principles in systems far from equilibrium.…”

Section: Introductionmentioning

confidence: 99%

“…First, prior models [20] take no account of the metastable c phase (orthorhombic, Al 4 U type), which has been observed in various devitrification sequences. [9,10] We have previously investigated the relative stability of the c phase along with other Al 4 Sm and Al 11 Sm 3 phases and incorporate our prior results into the general model here. [11] Second, while experimental evidence for the relative stability of the a phase is unclear, [12][13][14][15][16][17][18][19][20] it has been treated as a stable phase, and it appears in the equilibrium phase diagram proposed by Saccone, [20] as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…[11,14,15,[20][21][22][23][24][25][26][27][28][29][30][31][32][33] The resulting thermodynamic properties and the corresponding equilibrium phase diagram are compared with the prior thermodynamic modeling reported by Saccone et al [20] Finally, the computed metastable liquidus curves for the Al 4 Sm-b and fcc phases are examined and compared with reported observations of crystallization from the undercooled liquid or amorphous state. [9,10] …”

Section: Introductionmentioning

confidence: 99%

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Modeling of Thermodynamic Properties and Phase Equilibria for the Al-Sm Binary System

Zhou

Napolitano

2008

Metall Mater Trans A

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The thermodynamic properties and associated phase equilibria for the Al-Sm binary system are examined, and experimental results regarding the stability of the Al 3 Sm, Al 11 Sm 3 , and Al 4 Sm intermetallics are incorporated. In the analysis presented, the liquid phase is described using a three-species association model, the intermediate phases are treated as stoichiometric compounds, and the terminal phases are treated as solid solutions with a single sublattice model. In addition to the stable phases, thermodynamic descriptions of the metastable Al 11 Sm 3 -α and Al 4 Sm-γ phases are employed, and both stable and metastable phase equilibria are presented over the full composition range, providing a general model, which is consistent with available experimental data. Metastable liquidus curves are examined with respect to the observed crystallization behavior of amorphous Al-Sm alloys. Modeling of Thermodynamic Properties and Phase Equilibria for the Al-Sm Binary System Keywords S.H. ZHOU and R.E. NAPOLITANOThe thermodynamic properties and associated phase equilibria for the Al-Sm binary system are examined, and experimental results regarding the stability of the Al 3 Sm, Al 11 Sm 3 , and Al 4 Sm intermetallics are incorporated. In the analysis presented, the liquid phase is described using a three-species association model, the intermediate phases are treated as stoichiometric compounds, and the terminal phases are treated as solid solutions with a single sublattice model. In addition to the stable phases, thermodynamic descriptions of the metastable Al 11 Sm 3 -a and Al 4 Sm-c phases are employed, and both stable and metastable phase equilibria are presented over the full composition range, providing a general model, which is consistent with available experimental data. Metastable liquidus curves are examined with respect to the observed crystallization behavior of amorphous Al-Sm alloys.

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Section: A Model Formulationmentioning

confidence: 99%

“…From Eq. [9], the molar enthalpy and entropy of mixing for the system are computed as [35] Parameter [4][5][6], the ratio of mole numbers is given by…”

Section: A Model Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling of Thermodynamic Properties and Phase Equilibria for the Al-Sm Binary System

Zhou

Napolitano

2008

Metall Mater Trans A

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Optical Properties and Electronic Characteristics of Polycrystalline and Amorphous Thin Films of the Al4Sm Alloy

et al. 2023

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The Stability of Al11Sm3 (Al4Sm) Phases in the Al-Sm Binary System

Zhou

Napolitano

2007

Metall Mater Trans A

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The relative stability of Al 11 Sm 3 (Al 4 Sm) intermetallic phases was experimentally investigated through a series of heat treatments followed by microstructural, microchemical, and X-ray diffraction (XRD) analyses. The principal findings are that the high-temperature tetragonal phase is stable from 1655 to 1333 K and that the low-temperature orthorhombic phases, α and γ, have no range of full stability but are metastable with respect to the crystalline Al and Sm reference states down to 0 K. Thermodynamic modeling is used to describe the relative energetics of stable and metastable phases along with the associated two-phase mixtures. Issues regarding transition energetics and kinetics are discussed. The Stability of Al 11 Sm 3 (Al 4 Sm) Phases in the Al-Sm Binary System S.H. ZHOU and R.E. NAPOLITANOThe relative stability of Al 11 Sm 3 (Al 4 Sm) intermetallic phases was experimentally investigated through a series of heat treatments followed by microstructural, microchemical, and X-ray diffraction (XRD) analyses. The principal findings are that the high-temperature tetragonal phase is stable from 1655 to 1333 K and that the low-temperature orthorhombic phases, a and c, have no range of full stability but are metastable with respect to the crystalline Al and Sm reference states down to 0 K. Thermodynamic modeling is used to describe the relative energetics of stable and metastable phases along with the associated two-phase mixtures. Issues regarding transition energetics and kinetics are discussed.

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Crystallization behavior of Al100 − xSmx (x = 8–14 at%) amorphous alloys

Cited by 18 publications

References 6 publications

Modeling of Thermodynamic Properties and Phase Equilibria for the Al-Sm Binary System

Modeling of Thermodynamic Properties and Phase Equilibria for the Al-Sm Binary System

Optical Properties and Electronic Characteristics of Polycrystalline and Amorphous Thin Films of the Al4Sm Alloy

The Stability of Al11Sm3 (Al4Sm) Phases in the Al-Sm Binary System

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