Microstructural evolution and phase transformation kinetics of MnBi alloys

Xiang, Zhen; Wang, Taolei; Ma, Shangjun; Qian, Liwei; Luo, Zhengyi; Song, Yiming; Yang, Huawei; Lü, Wei

doi:10.1016/j.jallcom.2018.01.147

Cited by 25 publications

(6 citation statements)

References 32 publications

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“…The low-temperature phase MnBi is formed by peritectic reaction according to the Mn-Bi phase diagram [14]. Mn and Bi are easy to precipitate from the alloy during the solidification process [15,16]. The reaction kinetics of the precipitated Mn and Bi is poor and synthesizing high purity LTP MnBi is difficult.…”

Section: Methodsmentioning

confidence: 99%

Preparation and magnetic properties of MnBi alloy and MnBi /Fe hybrid magnets

Guo

Zeng

et al. 2020

Micro & Nano Letters

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Section: Methodsmentioning

confidence: 99%

Preparation and magnetic properties of MnBi alloy and MnBi /Fe hybrid magnets

Guo

Zeng

et al. 2020

Micro & Nano Letters

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“…Although first postulate of Kolmogorov assumes a complete transformation of the system, this restriction is generally overseen after normalizing the transformed fraction to 1 at the end of the considered process by dividing the actual transformed fraction

x (t)

by the final one,

X = x (t) / x^{end}

. In fact, KJMA analysis was widely applied to primary crystallization, [ 44–51 ] precipitation, [ 52–58 ] eutectoid, [ 59,60 ] and quasicrystals formation [ 61 ] using this normalization. This yields an extra source of error in the data, as the final transformed fraction must be measured.…”

Section: Effects Of Indetermination Of Experimental Data In Kjma Anal...mentioning

confidence: 99%

A Review of Different Models Derived from Classical Kolmogorov, Johnson and Mehl, and Avrami (KJMA) Theory to Recover Physical Meaning in Solid‐State Transformations

Blázquez

Romero

Conde

et al. 2022

Physica Status Solidi (b)

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The classical theory of solid‐state transformation based on nucleation and growth processes, developed by Kolmogorov, Johnson and Mehl, and Avrami (KJMA theory), is widely used in many different fields of research. In KJMA theory, two parameters (the frequency factor and, particularly, the Avrami exponent) can supply information about the mechanisms involved in the transformation. Despite its apparent simplicity, on the one hand, the results derived from this theory can be strongly affected by the indetermination of experimental data (e.g., onset of the transformation). On the other hand, KJMA theory is developed for isothermal polymorphic transformations in which randomly distributed nuclei grow in convex shapes. However, several procedures have extended KJMA theory to nonisothermal regimes and to many different processes deviating from those premises. Herein, the requirements of KJMA theory and the expected deviations for these approximations are briefly discussed. In addition, some strategies are proposed for recovering physical meaning from the effective parameters deduced in several transformations including nanocrystallization and martensitic transformations for which results can be interpreted under the approximation of instantaneous growth.

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“…Then the JMA equation can be extended to non-isothermal condition. By incorporating of Equations (3) and 4, after some mathematic treatment, the kinetic exponent can be obtained by the following equation [31]:…”

Section: Calculation Of Avrami Exponentmentioning

confidence: 99%

“…Then the kinetic exponent n can be determined from the slope of the ln(−ln(1 − f )) vs. 1/T curve. For a real phase transformation, the Avrami exponent n will change with the transformed volume fraction and the so-called local Avrami exponent are always used to determine the changing kinetic exponet at different transformed volume fraction [31]:…”

Section: Calculation Of Avrami Exponentmentioning

confidence: 99%

Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating

Wang

Chen

Yang

et al. 2018

Metals

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The phase transformation kinetics of a face-centered-cubic (FCC) Al0.25CoCrFeNi high-entropy alloy during isochronal heating is investigated by thermal dilation experiment. The phase transformed volume fraction is determined from the thermal expansion curve, and results show that the phase transition is controlled by diffusion controlled nucleation-growth mechanism. The kinetic parameters, activation energy and kinetic exponent are determined based on Kissinger–Akahira–Sunose (KAS) and Johnson–Mehl–Avrami (JMA) method, respectively. The activation energy and kinetic exponent determined are almost constant, indicating a stable and slow speed of phase transition in the FCC Al0.25CoCrFeNi high-entropy alloy. During the main transformation process, the kinetic exponent shows that the phase transition is diffusion controlled process without nucleation during the transformation.

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Microstructural evolution and phase transformation kinetics of MnBi alloys

Cited by 25 publications

References 32 publications

Preparation and magnetic properties of MnBi alloy and MnBi /Fe hybrid magnets

Preparation and magnetic properties of MnBi alloy and MnBi /Fe hybrid magnets

A Review of Different Models Derived from Classical Kolmogorov, Johnson and Mehl, and Avrami (KJMA) Theory to Recover Physical Meaning in Solid‐State Transformations

Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating

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