Kinetics of crystallization in continuously cooled BMG

Lee, Sang Bok; Kim, Nack J.

doi:10.1016/j.msea.2005.05.038

Cited by 12 publications

(4 citation statements)

References 39 publications

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“…In our previous study, the approach based on heterogeneous nucleation theory has been developed, which successfully described the crystallization behavior of the Zr-base Vit-1 alloy [17] and Mg-Cu-(Y,Gd) alloy [19] during cooling. The same approach has been used in the present study to compare the crystallization kinetics of P0 and P1 alloys during cooling.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal analyses were carried out in a differential thermal analyzer (SDT Q600, TA Instruments) under flowing high-purity Ar atmosphere with two different cooling rates (5 K/min and 20 K/min). The detailed procedures for thermal analyses and simulation are described elsewhere [17]. To gain information on the optimum twin-roll strip casting conditions, which allow for successful fabrication of amorphous alloy sheets, thermal behavior during twin-roll strip casting of the alloys was simulated with FLUENT.…”

Section: Methodsmentioning

confidence: 99%

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Solidification Behavior of Fe-Base Amorphous Alloys during Twin-Roll Strip Casting

Lee

Kim

et al. 2006

AMR

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Solidification behavior of two Fe-base amorphous alloys during twin-roll strip casting has been investigated in the present study. Continuous cooling transformation (CCT) diagrams of both alloys were calculated using the heterogeneous nucleation theory coupled with thermal data obtained during cooling. Cooling sequence during twin-roll strip casting was also simulated. These were used for the determination of the optimum twin-roll strip casting conditions at which desirable solidification behavior could be achieved. It shows that twin-roll strip casting can continuously fabricate sheet product of Fe-base bulk amorphous alloys, despite their higher liquidus temperatures and larger differences between liquidus and glass transition temperatures (Tg) than those of other easier glass-forming bulk amorphous alloys.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Solidification Behavior of Fe-Base Amorphous Alloys during Twin-Roll Strip Casting

Lee

Kim

et al. 2006

AMR

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“…D * is the fragility parameter (1 ≤ D * ≤ 100). η 0 has the relation of η 0 = N A h/V , with N A , Avogadro’s constant, h , Planck’s constant and V , the molar volume [ 31 ]. In this paper, the values of V are calculated by the JMatPro software and then we can get the value of η 0 .…”

Section: Calculation Of Time Reduced Temperature Transformation (Tmentioning

confidence: 99%

Simulation of the Continuous Casting and Cooling Behavior of Metallic Glasses

Pei

2017

Materials

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The development of melt spinning technique for preparation of metallic glasses was summarized. The limitations as well as restrictions of the melt spinning embodiments were also analyzed. As an improvement and variation of the melt spinning method, the vertical-type twin-roll casting (VTRC) process was discussed. As the thermal history experienced by the casting metals to a great extent determines the qualities of final products, cooling rate in the quenching process is believed to have a significant effect on glass formation. In order to estimate the ability to produce metallic glasses by VTRC method, temperature and flow phenomena of the melt in molten pool were computed, and cooling rates under different casting conditions were calculated with the simulation results. Considering the fluid character during casting process, the material derivative method based on continuum theory was adopted in the cooling rate calculation. Results show that the VTRC process has a good ability in continuous casting metallic glassy ribbons.

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“…Currently, researchers are focused on investigating crystallizations of metallic glasses [ 27 , 28 , 29 , 30 ]. To date, there have not been any precise investigations of the crystallization kinetics of Mg–Zn–Ca metallic glasses.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg72Zn24Ca4 Alloy

et al. 2021

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The aim of this study was to analyze the crystallization of the Mg72Zn24Ca4 metallic glass alloy. The crystallization process of metallic glass Mg72Zn24Ca4 was investigated by means of the differential scanning calorimetry. The glass-forming ability and crystallization are both strongly dependent on the heating rate. The crystallization kinetics, during the isothermal annealing, were modelled by the Johnson–Mehl–Avrami equation. Avrami exponents were from 2.7 to 3.51, which indicates diffusion-controlled grain growth. Local exponents of the Johnson–Mehl–Avrami equation were also calculated. In addition, the Mg phase—being the isothermal crystallization product—was found, and the diagram of the time–temperature phase transformation was developed. This diagram enables the reading of the start and end times of the crystallization process, occurring in amorphous ribbons of the Mg72Zn24Ca4 alloy on the isothermal annealing temperature. The research showed high stability of the amorphous structure of Mg72Zn24Ca4 alloy at human body temperature.

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Kinetics of crystallization in continuously cooled BMG

Cited by 12 publications

References 39 publications

Solidification Behavior of Fe-Base Amorphous Alloys during Twin-Roll Strip Casting

Solidification Behavior of Fe-Base Amorphous Alloys during Twin-Roll Strip Casting

Simulation of the Continuous Casting and Cooling Behavior of Metallic Glasses

Analysis of the Crystallization Kinetics and Thermal Stability of the Amorphous Mg72Zn24Ca4 Alloy

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