Characterization of Cold-Sprayed FeAl/WC Nanocomposite Coating

2013 ◽  
Vol 423-426 ◽  
pp. 63-66
Author(s):  
Hong Tao Wang ◽  
Ruo Yu Wang ◽  
Xiao Chen ◽  
Xiao Bo Bai ◽  
Zeng Xiang Dong ◽  
...  
Keyword(s):  
Grain Size ◽  
Lamellar Structure ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Cold Spraying ◽  
Nanocomposite Coating ◽  
Mechanically Alloyed ◽  
Dense Microstructure ◽  
Before And After

A FeAl/WC nanocomposite coating was produced by cold spraying of mechanically alloyed Fe/Al/WC composite powder assisted with annealing treatment. The microstructure and grain size of FeAl/WC nanocomposite coating before and after annealing treatment were characterized. The results indicated that as-sprayed Fe (Al)/WC nanocomposite coating presented a dense microstructure with lamellar structure. The phase transformation from Fe (Al) solid solution to FeAl intermetallics within as-sprayed nanocomposite coating occurred when annealed at 550°C for 25 h. The annealed nanocomposite coating was composed of nanograins of size ranging from 50-100 nm and the grain size of FeAl increased with increasing the annealing time. Moreover, the effect of annealing temperature on the microstructure of the FeAl/WC nanocomposite coating was investigated.

Preparation and Characterization of Zn-Se Bilayer Structure

2007 ◽  
Vol 31 ◽  
pp. 153-157
Author(s):  
M. Singh ◽  
J.S. Arora ◽  
Kamlendra Awasthi ◽  
R. Nathawat ◽  
Y.K. Vijay
Keyword(s):  
Grain Size ◽  
Annealing Temperature ◽  
Hexagonal Structure ◽  
Scattering Data ◽  
Bilayer Structure ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
Rutherford Back Scattering ◽  
Back Scattering

The Zn-Se bilayer structure prepared using thermal evaporation method at pressure 10-5 Torr. These films annealed in the vacuum for two hours on different constant temperatures. The optical band gap was found to be varying with annealing temperature due to removal of defects and increase in grain size. It was also observed by the X-ray diffraction pattern the grain size of the film increase with annealing temperature. The lattice constant of hexagonal structure of these films is found to be a =b=4.42Å and c=5.68Å. The dominant peaks to be at 23.2°,28° and 43.9° having values (100), (002) and (111) respectively. The Rutherford back scattering data of these films confirmed the mixing of elements with time.

Effects of Processing Technic on Grain Size of Copper Clad Steel Wire

2012 ◽  
Vol 567 ◽  
pp. 116-122 ◽  
Author(s):  
Qing Mei Wu ◽  
De Qing Wang ◽  
Yang Gao
Keyword(s):  
Grain Size ◽  
Cross Section ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Steel Wire ◽  
Annealing Treatment ◽  
Longitudinal Section ◽  
Diameter Ratio ◽  
Strip Shape ◽  
Clad Steel

The method adopted to manufacture copper clad steel wire in this study is cladding and welding and then drawing and annealing it. The effect of drawing deformation and annealing treatment on the grain size of α-Fe phase were studied. Experimental results show that the grain sizeα in cross section of α-Fe phase is decreased with the increase of the drawing deformation. Grains of the longitudinal section are elongated toward the drawing direction and appeared a strip shape. The grain size in cross-section of α-Fe phase is enhanced with the increase of the annealing time and annealing temperature, its length diameter ratio in longitudinal section is decreased oppositely. The grain size in cross section and length diameter ratio in longitudinal section are almost invariant in 850 °C for 2 h, the grain in longitudinal section tends to be equiaxial, the recrystallization processes is thus finished at this moment. Through the experimental data analysis, the regression equation about the relation of annealing temperature and annealing time of CCS with the grain size in cross section and length diameter ratio in longitudinal section are obtained.

scholarly journals Characterization of Thermally Annealed Sb Implanted Fused Silica

1993 ◽  
Vol 316 ◽  
Author(s):  
S.H. Morgan ◽  
Z. Pan ◽  
D.O. Henderson ◽  
S.Y. Park ◽  
R.A. Weeks ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Annealing Treatment ◽  
Local Environment ◽  
Fused Silica ◽  
Index Of Refraction ◽  
Oxide Glasses ◽  
Before And After ◽  
Nonlinear Index ◽  
Optical Behavior

ABSTRACTThe local environment of the polarizable ion in heavy metal oxide glasses is postulated to strongly influence the nonlinear response of these materials. We have previously observed that post-implantation thermal annealing changes the chemical properties of the implanted layer in a different fashion in Pb- and Bi- implanted SiO2. In this paper we report the optical behavior of Sb-implanted SiO2 as a function of annealing temperature and atmosphere. High purity fused silica substrates were implanted at room temperature to a dose of 6 × 1016 ions/cm2, and subsequently annealed at temperatures from 500 to 1000 C in argon and oxygen atmospheres. RBS, optical absorption (1.8 to 6.2 eV), infrared reflectance (450 to 5000 cm-1), and nonlinear index of refraction were measured before and after annealing. The results of these measurements indicate that annealing treatment significantly affects the local environment of the implanted Sb ions, and consequently the optical response.

Influence of Annealing Treatment on N-Doped TiO2 Films Deposited by Pulsed Negative Bias Arc Ion Plating

2012 ◽  
Vol 482-484 ◽  
pp. 1105-1110
Author(s):  
Shu Juan Zhang ◽  
Ming Sheng Li ◽  
Zhi Qin Chen ◽  
Yong Zhong Fan
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Catalytic Performance ◽  
Film Structure ◽  
Negative Bias ◽  
Arc Ion Plating ◽  
Ion Plating ◽  
Absorption Edges

The N-doped TiO2thin films were deposited on medical glass slide by pulsed negative bias arc ion plating. The influence of pulsed negative bias, annealing temperature and time on films properties was investigated. Film structure, surface morphologies and optical properties were measured with XRD, SEM and UV-VIS transmittance spectroscope. Photo-catalytic performance of the films was evaluated by degrading methyl orange. The results show that the absorption edges of the as-deposited films increase with the rising of the pulse negative bias, and the maximum of 550 nm is achieved under -600V bias. The films absorption edges increase in different degree after annealing at 400°Cand 500°Cfor 2h, and the best extending can increase 22nm after annealing. The diffraction peak intensity and surface grain size increase with increasing the annealing temperature and time. The grain size of films after annealing at 400°C for 4h is largest of all the films. The pulsed negative bias and annealing treatment not only indecrease TiO2thin films the UV catalytic performance, but also extend the catalytic properties to the sunlight.

Fabrication of Nano-Crystalline Porous Silicon on Si Substrates by a Plasma Enhanced Hydrogenation Technique

2005 ◽  
Vol 862 ◽  
Author(s):  
Y. Abdi ◽  
P. Hashemi ◽  
F. Karbassian ◽  
F.D. Nayeri ◽  
A. Behnam ◽  
...  
Keyword(s):  
Grain Size ◽  
Crystalline Silicon ◽  
Annealing Treatment ◽  
Hydrogenation Process ◽  
Porous Structures ◽  
Si Substrates ◽  
Visible Light Range ◽  
Nano Crystalline ◽  
Silicon Structures

AbstractA novel plasma hydrogenation method for the fabrication of nano-crystalline structures of silicon as well as the photoluminescence and structural properties of these porous structures is presented. We have observed that the hydrogenation process followed by an annealing treatment results in the formation of nano-crystalline silicon structures where increased temperatures during hydrogenation reduces the grain size. Furthermore, by increasing the time of the hydrogenation process, the density of the silicon grains is increased.Photoluminescence (PL) spectroscopy demonstrated the presence of a direct gap in the visible light range where materials with a smaller grain size emitted light at lower wavelengths, and a higher density of grains resulted in higher amplitudes in the PL spectrum. TEM and SEM characterization of these samples and the structure-emission relationship are also presented.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF TiB2 NANOCRYSTALLINE POWDER BY MECHANICAL ALLOYING

2012 ◽  
Vol 05 ◽  
pp. 204-211 ◽  
Author(s):  
MAHBOOBEH MOALLEM ◽  
MOHAMMAD HASAN ABBASI ◽  
FATHOLLAH KARIM ZADEH
Keyword(s):  
Grain Size ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Lattice Strain ◽  
Structural Evolution ◽  
Nanocrystalline Powder ◽  
Combustion Mechanism ◽  
Mechanically Alloyed ◽  
Xrd Patterns

In this investigation, TiB 2 nanocrystalline powder was synthesized by mechanical alloying of the elemental mixture of Ti and B powders in argon atmosphere. In order to study the structural evolution of the powder during ball milling, X-Ray diffraction (XRD) and scanning electron microscopy (SEM) were used. Adiabatic temperature calculations were performed for characterization of TiB 2 powder. Also, the effects of heat treatment on the structural evolution and thermal stability of mechanically alloyed powders were investigated. It was found from the XRD patterns that TiB 2 was formed via combustion mechanism. By increasing milling time, the grain size decreased while the lattice strain increased. SEM micrographs showed that TiB 2 particles were spherical. The grain size and lattice strain reached 24 nm and 1.8% respectively, after 60 hours ball milling.

scholarly journals Microstructural Characterization of Nb-Al Base ODS Alloys

2010 ◽  
Vol 654-656 ◽  
pp. 436-439 ◽  
Author(s):  
Shigeharu Ukai ◽  
Akinobu Minami ◽  
Shigenari Hayashi ◽  
Norihito Sakaguchi ◽  
Seiji Miura
Keyword(s):  
Solid Solution ◽  
Plastic Deformation ◽  
Grain Size ◽  
Microstructural Characterization ◽  
Dual Phase ◽  
Mechanically Alloyed ◽  
Oxide Particles ◽  
Ods Alloys ◽  
Nb3al Compound

Nb, Al and Y2O3 powders were mechanically alloyed together with 5 wt% stearic acid. The heavy plastic deformation of the powders by mechanical alloying led significant hardening to 970 Hv and the reduced grain size to 10 nm. Nb-Al base ODS alloys consolidated by HIP at 1500 °C and 150 MPa for 0.5 h gave the dual phase of Nb solid solution and Nb3Al compound. The oxide particles are of the hexagonal type YAlO3 (YAH), with the size of 50 nm to 200 nm. The high-temperature ductility at 1200 °C and capability of the grain growth at 2000 °C were confirmed.

Structural Properties of Al-Cu Thin Films after Heat Treatment

2009 ◽  
Vol 609 ◽  
pp. 87-93
Author(s):  
S. Lallouche ◽  
M.Y. Debili
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Dislocation Density ◽  
Annealing Temperature ◽  
Exothermic Peak ◽  
Thermal Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Decomposition Behaviour

In this work we are interested by the decomposition behaviour after heat treatment at 500°C of nanostructured Al-Cu deposits, prepared by radio frequency (13.56MHz) magnetron sputtered from composite targets. The use of X-ray diffraction leads to the characterization of different structures and the estimation of grain size and dislocation density. The grain size of the films is found to increase with annealing. The dislocation density is observed to exhibit a decrease trend with annealing temperature which leads to a reduction in the concentration of lattice imperfections A specific thermal study of the Al-Cu deposits, by combined thermal analysis (TDA/TG) permit to follow the structural behavior of the deposits with heat treatment. For Al-7.21at%Cu deposit, the exothermic peak convolution may be due to the elimination of micro deformations present in the sample.

scholarly journals Influence of annealing temperature on reversible resistive switching of WOx thin filmsdeposited on FTO substrate

2014 ◽  
Vol 17 (3) ◽  
pp. 12-18
Author(s):  
Tam Thi Bang Dao ◽  
Thang Bach Pham
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Monoclinic Phase ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Crystalline Morphology ◽  
Annealing Temperatures ◽  
High Annealing ◽  
Bipolar Type ◽  
Switching Characteristics

In this work, we investigated effects of the annealing temperature on the crystalline, morphology of sputtered WOx thin films. The resutls show that as-deposited WOx thin films and annealed WOxthin films at 300oC, 600oC in the air are in monoclinic phase. As the annealing temperature increases, crystallinity of WOx thin films enhances with high(200) orientation. FESEM images showed larger grain size, and denser films at high annealing temperatures. The reversible resistance switching characteristics of the Ag/WOx/FTO structure follows bipolar type, the switching ratio decreases as the crystallinity of WOx thin films increases under an the annealing treatment.

Study on Evolution of Partial Texture of Different Grains during Grain Growth in IF Steels

2010 ◽  
Vol 638-642 ◽  
pp. 2799-2804 ◽  
Author(s):  
W.P. Tong ◽  
W.Y. Chen ◽  
Francis Wagner ◽  
L. Zuo ◽  
J.C. He
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Steel Sample ◽  
Temperature Dependent ◽  
Experiment Data ◽  
Texture Characteristic ◽  
Mean Grain Size ◽  
Cold Rolled

An IF steel sample was cold rolled to a reduction of 80% and subsequently submitted to annealing treatment at 650°C, 710°C and 770°C for various durations, respectively. The grain size and evolution of partial texture of small, medium and large grains were investigated during grain growth. It was found that the growth rate and partial texture characteristic were absolutely distinct at different annealing temperature, both were temperature dependent. At same annealing temperature, partial texture for various annealing time was similar, but its intensity increases with an increment of duration. And the relation between partial texture of different grains assembly and its mean grain size can be expressed by an empirical formula from experiment data.

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