Johnson-Mehl-Avrami方程最早由三位科学家Johnson、Mehl和Avrami于1939年提出,他们通过研究金属的晶化过程,提出了描述晶体生长动力学行为的数学模型。JMA方程在固体相变领域得到了广泛应用,并为研究固体材料的相变过程提供了重要的理论工具。 二、JMA方程的公式推导 3. JMA方程的一般形式 JMA方程的一般形式可以表示为: \...
Johnson-Mehl-Avrami modelOver the decades, the thermal analysis community has been effectively using the Johnson-Mehl-Avrami (JMA) equation to model the crystallization kinetics of the processes occurring in solid state. In a relatively recent approach, it has been pointed out that the two-...
The contention of Sarkar and Ray that Johnson-Mehl-Avrami equation is not a true kinetic equation is disproved. It is shown that this equation can be expressed in the form of a standard kinetic equation. The results of the authors are only an approximation of Johnson-Mehl-Avrami kinetics when...
andthediscrepancybetweentheJohnson-Mehl-Avramimethodandthemodifiedmethodincreaseswiththeincreaseofheatingrate. Keywords:amorphousalloys;crystallization;kinetics;Johnson-Mehl-Avramiequation;impingement [ThisworkwasfinanciallysupportedbytheNationalNaturalScienceFoundationofChina(No.50601011),theNationalBasicResearch ...
A test of the Johnson-Mehl-Avrami equationMonte Carlosimulationadsorptionpotential barriersThe Johnson-Mehl-Avrami (JMA) equation is evaluated for a phase transformation process in two dimensions via computer modelling. The JMA equation appears to be highly accurate over nearly the entire transformation ...
The kinetics of crystallization processes in solids are usually described by the Johnson–Mehl–Avrami equation. One of the most popular methods to test the applicability of this equation is based on a double logarithmic plot of fraction crystallized (α). However, such plot is not very sensitive...
H. Li et al., Non-isothermal phase-transformation kinetics model for evaluating the austenization of 55 CrMo steel based on Johnson-Mehl-Avrami equation, Materials & Design 92 (2016) 731-741Li HP, Gai K, He LF, Zhang CZ, Cui HZ, Li MS (2016) Non- isothermal phase-transformation ...
A temperature domain form of the standard Kolmogorov–Johnson–Mehl–Avrami (KJMA) equation is presented which can be used simulate phenomena such as phase transformation and recrystallization kinetics under non-isothermal conditions. This form of the KJMA equation relies on a parameterized temperature–...
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百度试题 题目Johnson-Mehl动力学方程与Avrami方程相比,具有___适用范围。 A.更宽的B.更窄的C.相同的相关知识点: 试题来源: 解析 B 反馈 收藏