Results 161 to 170 of about 93,771 (188)

The Activation Energy and the Avrami Exponent for Crystallization in Amorphous Fe70.45W1.55Si3B25

Physica B: Condensed Matter, 1994
The activation energy and the Avrami exponent for crystallization in amorphous Fe70.45W1.55Si3B25 are investigated with several methods at isothermal and nonisothermal conditions. The values of the activation energy derived by these methods are in agreement with each other, and the average value is 320 kJ/mole.
Wangyu Hu, Bangwei Zhang
exaly   +2 more sources

Remarks on Determination of the Avrami Exponent by Non-Isothermal Analysis

Journal of Non-Crystalline Solids, 1983
On met en evidence l'impossibilite a determiner la valeur de l'exposant d'Avrani n separement de celle de l'energie d'activation E, a partir d'une seule courbe ...
A Buri, S Saiello
exaly   +2 more sources

Effect of Concurrent Recovery on Avrami Exponent of the Softening Kinetics After Hot Deformation

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2012
Abstract Softening kinetics after hot deformation in the austenitic stainless steel, AISI 347, was investigated by stress relaxation tests in the temperature range of 970–1230 °C at the strain rates of 1–40 s−1. Stress relaxation data were analyzed by both the conventional and the new method presented here to determine the Avrami exponent of n.
Haiwen Luo
exaly   +2 more sources

Variation of Avrami Exponent for Crystallization of Melt-Spun Amorphous Ribbons

Journal of Non-Crystalline Solids, 1990
Abstract Crystallization process of a melt-spun amorphous NiP ribbon was studied by using differential scanning calorimetry. Local Avrami exponents for the crystallization were determined. It was found that the early stage of the transformation was dominated by surface nucleation and growth, middle stage was bulk nucleation and growth, and last ...
J T Wang
exaly   +2 more sources

Avrami Exponent and Isothermal Crystallization of Zr/Ti-Based Bulk Metallic Glasses

Journal of Alloys and Compounds, 2007
Abstract The isothermal crystallization kinetics of Zr/Ti-based bulk metallic glasses (BMGs) have been investigated by using Avrami exponent. It is a constant nucleation rate and a constant number of quenched-in nuclei that cause the linear John–Mehl–Avrami (JMA) modes in Avrami exponents of Zr 62 Al 8 Ni 13 Cu 17 and Zr 65 Al 8 Ni 10 Cu 17 BMGs ...
J Z Jiang, X D Wang
exaly   +2 more sources

Determination of the Avrami Exponent of Partially Crystallized Polymers by DSC- (DTA-) Analyses

Colloid and Polymer Science, 1983
This paper presents a new method for a rapid determination of the Avrami exponentn by nonisothermal thermoanalytic analysis (DSC and DTA, resp.). Contrary to conventional techniques this method can be used in the entire temperature range and therefore it is applicable to polymers crystallizing from the melt.
K. Harnisch, H. Muschik
exaly   +2 more sources

Diffusion Controlled Grain Growth in Primary Crystallization: Avrami Exponents Revisited

Journal of Physics Condensed Matter, 1998
The anomalous behaviour of the Avrami exponents found in the primary crystallization of amorphous alloys leading to nanostructured materials is considered. A kinetic model able to adequately treat such phase transformation has been formulated by means of the implementation of a soft-impingement diffusion mechanism after a transient interface controlled
Trinitat Pradell, Daniel Crespo, N Clavaguera   +2 more
exaly   +2 more sources

Determination of the Avrami Exponent for Solid State Transformations From Non-Isothermal Differential Scanning Calorimetry

Journal of Non-Crystalline Solids, 1994
Abstract Many solid state transformations follow the Johnson-Mehl-Avrami kinetic equation, particularly crystallization of polymers, glasses and amorphous metals. The value of the Avrami exponent in this relationship, important for understanding the reaction mechanism, is normally determined by isothermal differential scanning calorimetry. A computer
D W Kirk, S J Thorpe
exaly   +2 more sources

Crystallization Analysis and Determination of Avrami Exponents of CuAlNi Alloy by Molecular Dynamics Simulation

Physica B: Condensed Matter, 2013
In this study, local atomic rearrangements of Cu–%26.8Al–%2.5Ni ternary alloys (3 A) are investigated during their crystallization processes from amorphous phase using molecular dynamics (MD) simulations. These simulations are based on the Sutton–Chen type of embedded atom method (SCEAM) that employs many-body interactions.
Fatih Ahmet Çelik, Sefa Kazanc
exaly   +2 more sources

Avrami Exponents Versus Crystallization Mechanisms

Non-Crystalline and Nanoscale Materials, 1998
Trinitat Pradell, Daniel Crespo, N Clavaguera   +2 more
exaly   +2 more sources