Critical cooling rate for the glass formation of ferromagnetic Fe40Ni40P14B6 alloy

Li, Qiang

doi:10.1016/j.matlet.2006.11.058

Cited by 10 publications

(2 citation statements)

References 24 publications

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“…CCT curves are difficult to obtain, and are often calculated from isothermal temperature-time-transformation (TTT) curves by the Grange and Kiefer method 45 46 . Due to the resemblance of CCT curves and the upper parts of TTT curves 47 , TTT curves are widely used to schematically describe the crystallization process of a melt during continuous cooling 2 4 47 .…”

Section: Discussionmentioning

confidence: 99%

Two-phase quasi-equilibrium in β-type Ti-based bulk metallic glass composites

Zhang

Pauly

Tang

et al. 2016

Sci Rep

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The microstructural evolution of cast Ti/Zr-based bulk metallic glass composites (BMGCs) containing β-Ti still remains ambiguous. This is why to date the strategies and alloys suitable for producing such BMGCs with precisely controllable volume fractions and crystallite sizes are still rather limited. In this work, a Ti-based BMGC containing β-Ti was developed in the Ti-Zr-Cu-Co-Be system. The glassy matrix of this BMGC possesses an exceptional glass-forming ability and as a consequence, the volume fractions as well as the composition of the β-Ti dendrites remain constant over a wide range of cooling rates. This finding can be explained in terms of a two-phase quasi-equilibrium between the supercooled liquid and β-Ti, which the system attains on cooling. The two-phase quasi-equilibrium allows predicting the crystalline and glassy volume fractions by means of the lever rule and we succeeded in reproducing these values by slight variations in the alloy composition at a fixed cooling rate. The two-phase quasi-equilibrium could be of critical importance for understanding and designing the microstructures of BMGCs containing the β-phase. Its implications on the nucleation and growth of the crystalline phase are elaborated.

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Section: Discussionmentioning

confidence: 99%

Two-phase quasi-equilibrium in β-type Ti-based bulk metallic glass composites

Zhang

Pauly

Tang

et al. 2016

Sci Rep

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“…However, this diagram is experimentally difficult to be made, especially for some liquids with a strong trend to crystallization. In the frame of the TTT approach, there are three often used methods for measuring

q_{normalc}^{*}

: (i) identifying the minimum cooling rate at which the crystallization peak of a liquid appears upon cooling from the DTA/DSC curve; (ii) plotting continuous‐cooling‐temperature (CCT) diagram, and (iii) using the empirical equation to evaluate the cooling curves:

ln q_{normalc} = ln q_{c}^{*} ‐ B / false(T_{m} ‐ T_{c} false)

, where B is constant, T m and T c are the melting temperature and crystallization temperature, respectively.…”

Section: Introductionmentioning

confidence: 99%

A new approach for determining the critical cooling rates of nucleation in glass‐forming liquids

et al. 2017

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Crystallization of a liquid below liquidus temperature is a complex process due to simultaneous nucleation and growth of crystals. Nucleation is the crucial initial step of the crystallization process, and affects the glass‐forming ability, especially when there is a large overlap between nucleation and crystal growth versus temperature curves. From the temperature‐time‐transformation (TTT) diagram, one can estimate the critical cooling rate, qnormalc∗, of glass‐formation, however this is time‐consuming. In this paper, we establish a simple approach to determine the qnormalc∗ using calorimetric and viscometric data. Based on the classical nucleation theory, the correlation between the crystallization onset temperature and cooling rate is described by combining two temperature‐dependent functions. The new approach is applicable to a wide range of glass‐forming systems. This work also gives insight into heterogeneous nucleation and glass formation kinetics.

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Numerical Calculation of the Cooling Rate in the J-Quenching Technique

2009

Metall Mater Trans B

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Bulk amorphous Fe-Ni-P-B alloys in rod shape with a diameter as large as~2.5 mm were synthesized by means of a so-called J-quenching technique. The cooling rate of the specimen in the J-quenching technique was determined by the method of numerical calculation method in this article. The influence of various parameters on the cooling rate of the specimen in the J-quenching technique was also discussed.

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Critical cooling rate for the glass formation of ferromagnetic Fe40Ni40P14B6 alloy

Cited by 10 publications

References 24 publications

Two-phase quasi-equilibrium in β-type Ti-based bulk metallic glass composites

Two-phase quasi-equilibrium in β-type Ti-based bulk metallic glass composites

A new approach for determining the critical cooling rates of nucleation in glass‐forming liquids

Numerical Calculation of the Cooling Rate in the J-Quenching Technique

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