Grain size estimations from the direct measurement of nucleation and growth

2005 ◽  
Vol 87 (12) ◽  
pp. 124102 ◽  
Author(s):  
Hoo-Jeong Lee ◽  
Hai Ni ◽  
David T. Wu ◽  
Ainissa G. Ramirez
Keyword(s):  
Grain Size ◽  
Direct Measurement ◽  
Nucleation And Growth

Direct Measurement of Nucleation and Growth Modes in Titania Nanoparticles Generation by a CVD Method

2004 ◽  
Vol 37 (11) ◽  
pp. 1379-1389 ◽  
Author(s):  
Chan Soo Kim ◽  
Kikuo Okuyama ◽  
Koichi Nakaso ◽  
Manabu Shimada
Keyword(s):  
Direct Measurement ◽  
Nucleation And Growth ◽  
Titania Nanoparticles ◽  
Cvd Method ◽  
Growth Modes

Studying the Effect of Grain Size on Whisker Nucleation and Growth Kinetics Using Thermal Strain

2018 ◽  
Vol 48 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Eric Chason ◽  
Fei Pei ◽  
Nupur Jain ◽  
Andrew Hitt
Keyword(s):  
Grain Size ◽  
Growth Kinetics ◽  
Thermal Strain ◽  
Nucleation And Growth

A micromechanistic model of microstructure development during the combustion synthesis process

1995 ◽  
Vol 10 (4) ◽  
pp. 962-980 ◽  
Author(s):  
Yangsheng Zhang ◽  
Gregory C. Stangle
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Combustion Synthesis ◽  
Growth Parameters ◽  
Experimental Studies ◽  
Nucleation And Growth ◽  
Synthesis Process ◽  
Product Phase ◽  
Nucleation Sites ◽  
Rate Of Increase

The influence of the key nucleation and grain growth parameters on (i) the evolution of the microstructure of the product phase (on a microscopic level) and (ii) the combustion synthesis process (on a macroscopic level) were investigated for the combustion synthesis process in the Nb-C system. This work is an integral part of the continuing effort1–3 to develop a more complete theoretical model for combustion synthesis processes in general. In particular, the nucleation and growth of the NbC(s) product phase from the supersaturated liquid Nb/C mixture that appears briefly during the combustion synthesis process was treated in a greater detail by using a decidedly more sophisticated treatment of the nucleation and growth process (as developed in the field of rapid solidification and welding). It was shown that the microstructure of the NbC(s) product phase, including the evolution of the grain size and the size distribution, and the development of the grain's morphology, as well as the combustion wave velocity, are significantly influenced by the total number density of the nucleation sites, nmax, that are present in the system. The grain size distribution was shown to possess a monosize distribution, since during the combustion synthesis process the rate of increase of the degree of local undercooling was very high so that the nucleation process took place (locally) during a very brief period of time. This work provides a sound basis for developing a better control of the microstructure, and for a better understanding and interpretation of the results of related experimental studies.

Development of the Grain Size Distribution During the Crystallization of an Amorphous Solid

2011 ◽  
Vol 1308 ◽  
Author(s):  
Andreas Bill ◽  
Ralf B. Bergmann
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Growth Rates ◽  
Amorphous Solid ◽  
Amorphous Solids ◽  
Nucleation And Growth ◽  
Analytic Description ◽  
Silicon Thin Films ◽  
Random Nucleation

ABSTRACTWe present an overview of the theory developed over the last few years to describe the crystallization of amorphous solids. The microstructure of the crystallizing solid is described in terms of the grain size distribution (GSD). We propose a partial differential equation that captures the physics of crystallization in random nucleation and growth processes. The analytic description is derived for isotropic and anisotropic growth rates and allows for the analysis of different stages of crystallization, from early to full crystallization. We show how the timedependence of effective nucleation and growth rates affect the final distribution. In particular, we demonstrate that for cases described by the Kolmogorov-Avrami-Mehl-Johnson (KAMJ) model applicable to a large class of crystallization processes a lognormal type distribution is obtained at full crystallization. The application of the theory to the crystallization of silicon thin films is discussed.

Study on After-Forging Austenite Recrystallization Rule of Low-Pressure Rotor Steel 26Cr2Ni4MoV with Thermo-Torsion Method

2009 ◽  
Vol 628-629 ◽  
pp. 635-640
Author(s):  
Li Yong Ni ◽  
Peng Chao Kang ◽  
Zhu Bai Liu ◽  
Wen Hua Yang
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Static Recrystallization ◽  
Low Pressure ◽  
Nucleation And Growth ◽  
Rotor Steel ◽  
Theoretical Base ◽  
Torsion Experiment ◽  
Austenite Recrystallization

In order to investigate the nucleation and growth of after-forging static recrystallization of low-pressure rotor steel 26Cr2Ni4MoV, the thermo-torsion experiment was conducted at 900°C,1000°C and 1100°C, respectively. The outer deformation of the used specimens was 0.21. The specimens were kept under a certain temperature for different periods. Results show that the recrystallization grain grew slowly at 900°C and the grain size became even after 30 minutes. The sizes of most grains were almost constant and only several grains grew bigger after 60 minutes. When the specimens were kept at 1000°C and 1100°C for one minute, static recrystallization was completed and the grain size was even. The said research could provide theoretical base for the controlled forging and after-forging heat treatment.

scholarly journals Synthesis of single-crystalline Pb(Zr0.52Ti0.48)O3 nanocrystals by hydrothermal method

2019 ◽  
Vol 37 (3) ◽  
pp. 473-481
Author(s):  
Chunyu Deng ◽  
Chaoran Qin ◽  
Xinyi Li ◽  
Shaoqing Li ◽  
Zhixiong Huang ◽  
...  
Keyword(s):  
Grain Size ◽  
Hydrothermal Method ◽  
Reaction Temperature ◽  
Single Phase ◽  
Reaction Times ◽  
Nucleation And Growth ◽  
Flexible Substrates ◽  
Single Crystalline ◽  
Different Temperatures ◽  
20 Nm

AbstractPbZr0.52Ti0.48O3 nanocrystals were synthesized by a hydrothermal method. The effect of NaOH concentration, reaction temperature and time on nucleation and growth of PbZr0.52Ti0.48O3 nanocrystals was investigated. As the 0.05 mol/L PbZr0.52Ti0.48O3 precursors were heated at 200 °C for 21 h with NaOH concentration of 0.5 mol/L, the tetragonal PbZr0.52Ti0.48O3 nanocrystals were formed, and the grain size was more than 20 nm. With increasing the NaOH concentration from 0.5 to 1.5 mol/L, the grain size of PbZr0.52Ti0.48O3 nanocrystals decreased. When the precursors were heated at different temperatures (140 °C to 200 °C) for 21 h with 1.0 mol/L NaOH, single-phase PbZr0.52Ti0.48O3 nanocrystals were obtained at 160 °C to 200 °C. With increasing the reaction temperature from 160 °C to 200 °C, the grains size of PbZr0.52Ti0.48O3 nanocrystals increased from 5 nm to 9 nm. When the precursors were heated at 160 °C in different reaction times from 6 h to 21 h, the evolution from amorphous to crystalline PbZr0.52Ti0.48O3 nanocrystals in correlation with the reaction time was observed. Single crystalline PbZr0.52Ti0.48O3 nanocrystals with narrow size distribution (from 5 nm to 9 nm) were synthesized by controlling the NaOH concentration, reaction temperature and time. The obtained results can find potential application in preparing PbZr0.52Ti0.48O3 thin films on flexible substrates.

Direct Measurement of Nucleation and Growth Rates in Lysozyme Folding†

Biochemistry ◽  
1997 ◽  
Vol 36 (17) ◽  
pp. 5108-5112 ◽  
Author(s):  
Thomas Kiefhaber ◽  
Annett Bachmann ◽  
Gudrun Wildegger ◽  
Clemens Wagner
Keyword(s):  
Direct Measurement ◽  
Growth Rates ◽  
Nucleation And Growth

Prediction of Ferrite Transformation in Nb-Containing Microalloyed Steels during Continuous Cooling

2011 ◽  
Vol 189-193 ◽  
pp. 1137-1141
Author(s):  
Bing Yun ◽  
Jian Zhi Sun ◽  
Jian Lin Sun ◽  
Xiao Lei Dong
Keyword(s):  
Computer Simulation ◽  
Grain Size ◽  
Nucleation And Growth ◽  
Microalloyed Steels ◽  
Growth Theory ◽  
Transformation Behavior ◽  
Continuous Cooling ◽  
Ferrite Transformation ◽  
Ferrite Grain Size ◽  
Start Temperature

This paper considers for transformation behavior of Nb microalloyed steels, experiments had demonstrated the effect of Nb was obvious: lowered start temperature of ferrite transformation remarkably and forming more refined ferrite grain size. In this study, computer simulation of Nb-containing steels transformation during continuous cooling was carried out by adopting a classical nucleation and growth theory, the model was derived based on the theories and the experimental results, and the calculated start temperatures of ferrite transformation were compared with the results of experimental.

Sign in / Sign up

Export Citation Format

Share Document