XRD study of the grain growth in CdTe films annealed at different temperatures

2004 ◽  
Vol 81 (3) ◽  
pp. 363-369 ◽  
Author(s):  
J Enríquez
Keyword(s):  
Grain Growth ◽  
Xrd Study ◽  
Different Temperatures ◽  
Cdte Films

scholarly journals Induction Brazing for Rapid Localized Repair of Inconel 718

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1096
Author(s):  
Aprilia Aprilia ◽  
Jin Lee Tan ◽  
Yongjing Yang ◽  
Sung Chyn Tan ◽  
Wei Zhou
Keyword(s):  
Adverse Effects ◽  
Grain Growth ◽  
Inconel 718 ◽  
Vacuum Furnace ◽  
Slow Process ◽  
Prolonged Heating ◽  
Induction Brazing ◽  
Heating And Cooling ◽  
Short Period ◽  
Different Temperatures

Vacuum furnace has been used for brazing repair of aerospace components, but it is a slow process which typically takes a few hours. The prolonged heating and cooling cycles could cause some adverse effects on the components such as excessive grain growth. A rapid brazing technique using induction coil was studied to evaluate its suitability for localized repair. Induction brazing of Inconel 718 was carried out using AMS 4777 brazing paste at different temperatures (950 °C, 1050 °C and 1150 °C ) for various durations (2 min, 10 min and 20 min). Microstructure and microhardness were evaluated. The experimental results show that brazing at 1050 °C leads to desirable microstructures in a short period of merely 2 min. The study demonstrates the potential application of induction brazing for rapid localized aerospace repair.

XRD Study of the Influence of Heat Treatment on the Microstructure of Sol-Gel Processed ZrO2-Y2O3 Ceramics

1995 ◽  
Vol 398 ◽  
Author(s):  
C. Barrera-Solano ◽  
M. PiÑero ◽  
C. Jiménez-Solís ◽  
L. Gago-Duport
Keyword(s):  
Heat Treatment ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Profile Function ◽  
Xrd Study ◽  
Different Temperatures ◽  
Hydrolysis Of Metal Alkoxides ◽  
Induced Changes ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

ABSTRACTYSZ samples containing 5 and 10 mol% of Y203 were prepared by controlled hydrolysis of metal alkoxides. The dried powders were calcined at 800°C and then they were uniaxially pressed and sintered at different temperatures and next heated at 1400°C (∼ 5 MPa) or annealed at 1600°C for 24 h. The quantitative analysis of the experimental X-ray diffraction (XRD) spectra was performed by Whole Pattern Fitting (WPF). A Pseudo-Voigt (Thompson-Cox-Hastings) was used as shape profile function. The respective phase fractions (wt %) were fitted for both solid state solutions using the scale factor. The heat treatment induced changes are discussed.

Grain Growth during Annealing: Experiments and Modelling

2012 ◽  
Vol 715-716 ◽  
pp. 611-616 ◽  
Author(s):  
M. Candic ◽  
Bao Hui Tian ◽  
Christof Sommitsch
Keyword(s):  
Grain Growth ◽  
Second Phase ◽  
Excellent Correlation ◽  
Grain Sizes ◽  
Second Phase Particles ◽  
Different Temperatures ◽  
Grain Growth Kinetics ◽  
Parameter Approach ◽  
Annealing Experiments ◽  
Two Parameter

In the present work, for the description of grain coarsening, a probabilistic and a deterministic 2D cellular automaton simulation setup were developed. The results of the simulation have been validated by solution annealing experiments of austenitic stainless steel 304L (Fe-18Cr-8Ni) at different temperatures and times. Both cellular automata models show an excellent correlation between the experimental determined data and grain growth kinetics based upon considerations of temperature and second phase particles. Additionally, a two parameter approach of the probabilistic model was implemented, resulting in determining the grain sizes limiting normal and abnormal grains and accurate description of grain growth.

Effects of mesoporous structure on grain growth of nanostructured tungsten oxide

2004 ◽  
Vol 19 (9) ◽  
pp. 2687-2693 ◽  
Author(s):  
Lay Gaik Teoh ◽  
Jiann Shieh ◽  
Wei Hao Lai ◽  
Min Hsiung Hon
Keyword(s):  
Activation Energy ◽  
Surface Area ◽  
Grain Growth ◽  
Pore Diameter ◽  
Mesoporous Structure ◽  
Average Pore ◽  
Transmission Electron ◽  
Show Evidence ◽  
Different Temperatures ◽  
Adsorption Desorption

The effects of mesoporous structure on grain growth were investigated in this study. The synthesis was accomplished using block copolymer as the organic template and tungsten chloride as the inorganic precursor. Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy, x-ray diffractometry (XRD), transmission electron microscopy, and N2 adsorption/desorption isotherms were used to characterize the microstructures obtained for different temperatures. TGA and XRD analyses demonstrate that copolymers were expelled at 150–250 °C, and mesoporous structure was stable up to 350 °C. The pore diameter and the surface area evaluated from the Barrett-Joyner-Halenda model and Brunauer–Emmett–Teller method indicated that the average pore diameter is 4.11 nm and specific surface area is 191.5 m2/g for 250 °C calcination. Arrhenius equation used to calculate the activation energy for grain growth demonstrates that the activation energy for grain growth was about 38.1 kJ/mol before mesostructure collapse and 11.3 kJ/mol after collapse. These results show evidence of two different mechanisms governing the process of grain growth. The presence of the pore can be related to the obstacle for grain growth.

Strain Enhanced High Strength Cu–Ag–Zr Conductors

2009 ◽  
Vol 633-634 ◽  
pp. 707-715 ◽  
Author(s):  
Julia Lyubimova ◽  
Jens Freudenberger ◽  
Alexandere Gaganov ◽  
Hansjörg Klauss ◽  
Ludwig Schultz
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Phase Separation ◽  
Grain Growth ◽  
High Strength ◽  
Homogeneous Material ◽  
Growth Processes ◽  
Heat Treated ◽  
Different Temperatures ◽  
Zr Alloys

Recovery, recrystallisation and grain growth processes as well as the formation of a solid solution and the phase separation of a homogeneous material into a heterogeneous one are observed for Cu-Ag-Zr alloys heat-treated at different temperatures by means of mechanical, electrical and microstructural analyses. Heat treatments are shown to be an effective tool to enhance the strain to failure. If applied between several deformation steps the heat treatment causes an increase of both strain and strength limits.

Recrystallization and Grain Growth due to Annealing of an Ultrafine-Grained Al Alloy

2013 ◽  
Vol 753 ◽  
pp. 303-306
Author(s):  
Aicha Loucif ◽  
Roberto B. Figueiredo ◽  
Thierry Baudin ◽  
François Brisset ◽  
Terence G. Langdon
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Vickers Microhardness ◽  
High Pressure Torsion ◽  
Al Alloy ◽  
Size Refinement ◽  
Ultrafine Grained ◽  
Different Temperatures ◽  
Deformed State ◽  
Misorientation Angles

The evolution of the recrystallization microstructure at different temperatures and the related change in the microhardness were studied in an Al-6061 alloy after 2 turns of high-pressure torsion (HPT) by means of Vickers microhardness and EBSD analysis. The corresponding results show that HPT processing introduces a significant grain size refinement for the deformed state by comparison with the 150 µm grain size in the initial material. The microstructure after annealing at 200°C is relatively close to the as-processed one and the distribution of misorientation angles remains essentially unchanged. However, significant microstructural changes are produced with increasing annealing temperature and at the highest temperature (400°C) there is an abnormal grain growth. The variation of Vickers microhardness (Hv) after the different annealing treatments show a gradual decrease when the temperature increases.

scholarly journals Evaluation of the Austenitic Grain Growth by Thermoelectric Power Measurements

2004 ◽  
Vol 467-470 ◽  
pp. 863-868 ◽  
Author(s):  
Carlos Capdevila ◽  
Tommy De Cock ◽  
Francisca García Caballero ◽  
Carlos García-Mateo ◽  
Carlos García de Andrés
Keyword(s):  
Thermoelectric Power ◽  
Grain Growth ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Grain Sizes ◽  
Different Temperatures ◽  
Cold Rolled ◽  
The Mean ◽  
Power Measurements

The influence of the deformation grade on the recrystallised grain size has been studied in the AISI 304 stainless steel. Therefore, cold rolled samples of this material with reductions varying between 30% and 80% were annealed at different temperatures and subsequently quenched. The mean austenitic grain sizes were measured and compared. Moreover, the correlation between the variation of the thermoelectric power and the grain growth was investigated for each degree of prior deformation.

An Effect of High Magnetic Field on Grain Growth in Nanocrystalline Iron

2007 ◽  
Vol 539-543 ◽  
pp. 2793-2797 ◽  
Author(s):  
W.P. Tong ◽  
L.M. Wang ◽  
G.J. Ma ◽  
N.R. Tao ◽  
Liang Zuo
Keyword(s):  
Magnetic Field ◽  
Grain Growth ◽  
High Magnetic Field ◽  
Early Stage ◽  
Grain Structure ◽  
Surface Mechanical Attrition Treatment ◽  
Iron Sample ◽  
Mechanical Attrition ◽  
Different Temperatures ◽  
Nanocrystalline Iron

A nanostructured surface layer on a pure iron sample was prepared by surface mechanical attrition treatment (SMAT). The thermal stability of SMAT sample was investigated at different temperatures with or without a high magnetic field (H =12T). It was found that a high magnetically annealing enhanced grain growth at the early stage of annealing, and produced a uniform nanocrystalline grain structure. After homogeneous grains developed, further grain growth became restrained.

Study on Structure Stability of Ti-Al Multilaminate Material at High Temperature

2012 ◽  
Vol 217-219 ◽  
pp. 307-313
Author(s):  
Gang Feng ◽  
Chao Ge Zhang ◽  
Xian Rui Zhao ◽  
Li Ma
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Grain Growth ◽  
High Power ◽  
Pore Formation ◽  
Experimental Results ◽  
Structure Stability ◽  
Layered Architecture ◽  
Ordered Phases ◽  
Different Temperatures

Ti-Al multilaminate composite was prepared by high-power EB-PVD technology, and under vacuum condition, the samples were annealed at different temperatures. The changed microstructure of the samples after annealing was characterized by XRD, SEM and EDS. The experimental results show that, with the increment of temperature, the ordered phases reduce due to the diffusion of Al into Ti, and the breakdown of layered architecture was induced mainly by pore formation, grain growth and the grain boundary grooving.

Calcium Behaviors in MnZn Ferrite at Different Temperatures

2012 ◽  
Vol 512-515 ◽  
pp. 1412-1415 ◽  
Author(s):  
Ya Qiu Cai ◽  
Yang Yi Lin ◽  
X. Li ◽  
Jin Tao Huang ◽  
Takuya Aoki
Keyword(s):  
Critical Temperature ◽  
Grain Growth ◽  
Sintering Temperature ◽  
Magnetic Core ◽  
Homogeneous Microstructure ◽  
Grain Boundary Mobility ◽  
Liquid Phases ◽  
Different Temperatures ◽  
Temperature Ranges ◽  
Mnzn Ferrites

MnZn ferrites have been widely used as magnetic core materials. It is well known that Ca addition is effective to obtain homogeneous microstructure of fine grains and highly resistive grain boundaries. However, the behaviors of calcium as one of the main additives at different temperature ranges during sintering process are not completely understood yet. In this study, the influence of CaCO3 content and sintering temperature on the microstructure was investigated in 1473-1623 K. It was found that there existed a critical temperature around 1550 K. The grain size decreased with the increase of Ca content when the sintering temperature was lower than the critical temperature, but completely opposite result was observed at higher temperatures range. Possible mechanisms were discussed. When the sintering temperature was lower than the critical temperature, Ca content greatly affected the grain boundary mobility and dominated the grain growth. At higher temperatures, however, formation of liquid phases might be the main cause for the grain growth.

Sign in / Sign up

Export Citation Format

Share Document