scholarly journals Microstructure and texture analysis of δ-hydride precipitation in Zircaloy-4 materials by electron microscopy and neutron diffraction

2014 ◽  
Vol 47 (1) ◽  
pp. 303-315 ◽  
Author(s):  
Zhiyang Wang ◽  
Ulf Garbe ◽  
Huijun Li ◽  
Yanbo Wang ◽  
Andrew J. Studer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Neutron Diffraction ◽  
Profile Analysis ◽  
Zirconium Alloys ◽  
Average Density ◽  
Line Profile Analysis ◽  
Hydride Precipitation ◽  
Diffraction Line Profile ◽  
Transmission Electron ◽  
Order Of Magnitude

This work presents a detailed microstructure and texture study of various hydrided Zircaloy-4 materials by neutron diffraction and microscopy. The results show that the precipitated δ-ZrH1.66generally follows the δ(111)//α(0001) and δ[1{\overline 1}0]//α[11{\overline 2}0] orientation relationship with the α-Zr matrix. The δ-hydride displays a weak texture that is determined by the texture of the α-Zr matrix, and this dependence essentially originates from the observed orientation correlation between α-Zr and δ-hydride. Neutron diffraction line profile analysis and high-resolution transmission electron microscopy observations reveal a significant number of dislocations present in the δ-hydride, with an estimated average density one order of magnitude higher than that in the α-Zr matrix, which contributes to the accommodation of the substantial misfit strains associated with hydride precipitation in the α-Zr matrix. The present observations provide an insight into the behaviour of δ-hydride precipitation in zirconium alloys and may help with understanding the induced embrittling effect of hydrides.

scholarly journals Structure and morphology of shape-controlled Pd nanocrystals

2015 ◽  
Vol 48 (5) ◽  
pp. 1534-1542 ◽  
Author(s):  
Jose Solla-Gullon ◽  
Emmanuel Garnier ◽  
Juan M. Feliu ◽  
Matteo Leoni ◽  
Alberto Leonardi ◽  
...  
Keyword(s):  
Profile Analysis ◽  
Line Profile Analysis ◽  
Narrow Size Distribution ◽  
Miller Index ◽  
X Ray ◽  
Structure And Morphology ◽  
Surface Electrochemistry ◽  
Diffraction Line Profile ◽  
Transmission Electron ◽  
Shape Controlled

Pd nanocrystals were produced with uniform truncated-cube shape and a narrow size distribution, yielding controlled surface area fractions from low Miller index ({100}, {110}, {111}) crystalline facets. Details on the structure and morphology of the nanocrystals were obtained by combining X-ray powder diffraction line profile analysis, high-resolution transmission electron microscopy and surface electrochemistry based on Cu underpotential deposition.

scholarly journals Nanocrystalline materials studied by powder diffraction line profile analysis

2007 ◽  
Vol 222 (3-4) ◽  
Author(s):  
Tamas Ungár ◽  
Jeno Gubicza
Keyword(s):  
Electron Microscopy ◽  
Powder Diffraction ◽  
Nanocrystalline Materials ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
Ray Method ◽  
Crystalline Materials ◽  
X Ray ◽  
Diffraction Line Profile ◽  
The One

X-ray powder diffraction is a powerful tool for characterising the microstructure of crystalline materials in terms of size and strain. It is widely applied for nanocrystalline materials, especially since other methods, in particular electron microscopy is, on the one hand tedious and time consuming, on the other hand, due to the often metastable states of nanomaterials it might change their microstructures. It is attempted to overview the applications of microstruture characterization by powder diffraction on nanocrystalline metals, alloys, ceramics and carbon base materials. Whenever opportunity is given, the data provided by the X-ray method are compared and discussed together with results of electron microscopy. Since the topic is vast we do not try to cover the entire field.

scholarly journals Precipitation Microstructure of Ultrafine-Grained Al-Zn-Mg Alloys Processed by Severe Plastic Deformation

2007 ◽  
Vol 537-538 ◽  
pp. 169-176 ◽  
Author(s):  
Jenő Gubicza ◽  
I. Schiller ◽  
Nguyen Q. Chinh ◽  
Judit Illy
Keyword(s):  
Profile Analysis ◽  
High Strength ◽  
Precipitation Process ◽  
Line Profile Analysis ◽  
X Ray Diffraction ◽  
Diffraction Line Profile ◽  
Angular Pressing ◽  
Transmission Electron ◽  
Ultrafine Grained ◽  
Precipitation Microstructure

Supersaturated Al-4.8Zn-1.2Mg-0.14Zr and Al-5.7Zn-1.9Mg-0.35Cu (wt.%) alloys were processed by Equal-Channel Angular Pressing (ECAP) at 200°C. The crystallite size distribution and the characteristic parameters of the dislocation structure of both Al matrix and precipitates were determined by X-ray diffraction line profile analysis, which has been complemented by transmission electron microscopy (TEM) observations. Results of these investigations show that the bulk ultrafine-grained microstructure with high dislocation density produced by ECAP has strong influence on the precipitation process, resulting in high strength in both alloys.

Determination of Nanocrystalline Fe80Cr20 Powder Based Alloys Using Williamson-Hall Method

2010 ◽  
Vol 129-131 ◽  
pp. 999-1003 ◽  
Author(s):  
Hendi Saryanto ◽  
S. Khaerudini Deni ◽  
Pudji Untoro ◽  
Mat Husin Saleh ◽  
Darwin Sebayang
Keyword(s):  
Mechanical Alloying ◽  
Crystallite Size ◽  
Line Profile ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
X Rays ◽  
Diffraction Line Profile ◽  
Transmission Electron ◽  
Microstructure Morphology ◽  
Hall Method

The aim of this study is to determine the nanocrystalline size by using Williamson-Hall method of Fe80Cr20 powder which prepared by mechanical alloying process. X-rays diffraction line profile analysis was adopted to analyze the crystallite size and microstrains of Fe80Cr20 alloys powder. Transmission Electron Microscopy (TEM) was used to examine the microstructure morphology of the nanosized of Fe80Cr20 alloys. The crystallite size, microstrain, and lattice parameters were estimated by Williamson–Hall plot. The results showed that the mechanical alloying processes resulted the final product in nanocrystalline size range (below 12 nm) which confirmed by TEM observation and XRD line profile analysis.

Microstructure and Mechanical Behavior of Ultrafine-Grained Titanium

2008 ◽  
Vol 589 ◽  
pp. 99-104 ◽  
Author(s):  
Jenő Gubicza ◽  
Z. Fogarassy ◽  
György Krállics ◽  
János L. Lábár ◽  
Tamás Törköly
Keyword(s):  
Mechanical Behavior ◽  
Profile Analysis ◽  
Line Profile Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Line Profile ◽  
Angular Pressing ◽  
Transmission Electron ◽  
Ultrafine Grained ◽  
Deformation Processes

Ultrafine-grained titanium was processed by severe plastic deformation (SPD). The SPD was carried out by equal channel angular pressing (ECAP) at high temperature. The ECAPprocessed sample was further deformed by conventional techniques such as radial forging and drawing. The microstructure was characterized quantitatively by X-ray diffraction line profile analysis and transmission electron microscopy after each step of deformation. The effect of procesing routes on the mechanical behavior was also studied. It was found that the conventional deformation processes after ECAP result in further increment in dislocation density and strength at the expense of ductility.

scholarly journals Precipitation and Mechanical Properties of Supersaturated Al-Zn-Mg Alloys Processed by Severe Plastic Deformation

2006 ◽  
Vol 519-521 ◽  
pp. 835-840 ◽  
Author(s):  
I. Schiller ◽  
Jenő Gubicza ◽  
Zsolt Kovács ◽  
Nguyen Q. Chinh ◽  
Judit Illy
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Profile Analysis ◽  
Precipitation Process ◽  
Line Profile Analysis ◽  
X Ray Diffraction ◽  
Characteristic Parameters ◽  
Diffraction Line Profile ◽  
Angular Pressing ◽  
Transmission Electron

Supersaturated Al-4.8Zn-1.2Mg-0.14Zr and Al-5.7Zn-1.9Mg-0.35Cu (wt.%) alloys were processed by Equal-Channel Angular Pressing (ECAP) at 200°C. The crystallite size distribution and the characteristic parameters of the dislocation structure of both Al matrix and precipitates were determined by X-ray diffraction line profile analysis, which has been complemented by transmission electron microscopy (TEM) observations. The results show that severe plastic deformation promotes the precipitation process and consequently has a strong influence on the strength of these alloys.

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