The Effect of Temperature on Creep Behaviour of Porous (1 at.%) Nano Crystalline Nickel

2015 ◽  
Vol 69 (2) ◽  
pp. 277-282 ◽  
Author(s):  
Md. Meraj ◽  
S. Pal
Keyword(s):  
Creep Behaviour ◽  
Effect Of Temperature ◽  
Nano Crystalline

Structural Evolution and Physical Properties of Nano-Crystalline BiFeO3

2016 ◽  
Vol 852 ◽  
pp. 199-204
Author(s):  
Qing Rong Yao ◽  
Yi Hao Shen ◽  
Peng Cheng Yang ◽  
Huai Ying Zhou ◽  
Guang Hui Rao ◽  
...  
Keyword(s):  
Physical Properties ◽  
Crystallite Size ◽  
Structural Characterization ◽  
Structural Evolution ◽  
Average Crystallite Size ◽  
Decomposition Temperature ◽  
Type Structure ◽  
Effect Of Temperature ◽  
Structure Space ◽  
Nano Crystalline

The effect of temperature on the structural evolution and physical properties of nanocrystalline BiFeO3 compound has been studied systematically. The results show that the compound crystallizes in the hexagonal LiNbO3 type-structure (space group R3c) and the structural characterization was a=b=5.5979 Å, c=13.9163 Å and V=387.43 Å3. The average crystallite size was about 32.5 nm. The Neel temperature was the same in the vacuum and air conditions, but the decomposition temperature in the air condition was higher 190°C than that of the vacuum condition.

Effect of temperature on the dielectric and ferroelectric properties of a nanocrystalline hexagonal Ba4YMn3O11.5−δ ceramic synthesized by a chemical route

RSC Advances ◽  
2016 ◽  
Vol 6 (72) ◽  
pp. 68247-68253 ◽  
Author(s):  
Shiva Sundar Yadava ◽  
Laxman Singh ◽  
Sunita Sharma ◽  
K. D. Mandal ◽  
Narsing B. Singh
Keyword(s):  
Chemical Method ◽  
Ferroelectric Properties ◽  
Effect Of Temperature ◽  
Wet Chemical Method ◽  
Crystalline Powder ◽  
Chemical Route ◽  
Metal Nitrates ◽  
Nano Crystalline ◽  
Wet Chemical

A Ba4YMn3O11.5−δ (BYMO) nano-crystalline powder was prepared by a novel wet chemical method using metal nitrates and glycine as starting materials.

Creep behaviour of adhesive lap joints in thermoplastics composites

2005 ◽  
Vol 40 (3) ◽  
pp. 287-294 ◽  
Author(s):  
P. N. B Reis ◽  
I. A. M Ferreira ◽  
J. D. M Costa ◽  
M. O Richardson
Keyword(s):  
Fibre Composite ◽  
Creep Behaviour ◽  
Failure Mechanisms ◽  
Lap Joints ◽  
Effect Of Temperature ◽  
Microscopy Technique ◽  
Rate Versus ◽  
Properties Of Materials ◽  
Glass Fibre Composite ◽  
Mechanical Nature

Environmental factors, most of which are of a non-mechanical nature, have an influence on the properties of materials. A typical case is the temperature, which associated with load affects the performance of any structure in service. To study the effect of temperature in polypropylene-glass fibre composite adhesive lap joints, tests within the temperature range from 20 to 50 °C were carried out, and the results were plotted in terms of the deformation and strain rate versus time. The failure surfaces were also observed by the scanning microscopy technique to obtain the failure mechanisms. Creep parameters were correlated using the Manson-Haferd parameter, the Findley et al. equation and the Little et al. equation, the best agreement being with experimental results obtained with the last model.

Carbonization of Porous Silicon for 3C-SiC Growth

2007 ◽  
Vol 556-557 ◽  
pp. 167-170 ◽  
Author(s):  
A.V. Vasin ◽  
Yukari Ishikawa ◽  
Noriyoshi Shibata ◽  
Jarno Salonen ◽  
Vesa Pekka Lehto
Keyword(s):  
Porous Silicon ◽  
Flow Rate ◽  
Critical Values ◽  
Chemical State ◽  
Effect Of Temperature ◽  
Crystalline Morphology ◽  
Structure Relaxation ◽  
Temperature Range ◽  
Nano Crystalline

In the present work, the carbonization of porous silicon for the subsequent 3C-SiC growth has been systematically studied. The effect of temperature and acetylene flow-rate on the chemical state of the surface and structure relaxation was studied. It was found that the porous nano-crystalline morphology is unstable and tends to recrystallize in temperature range typical of 3C-SiC growth on Si (10000C-13000C). The carbonization impedes recrystallization at 10000C, but at 13000C the full recrystallization takes place. Pyrolytic amorphous graphite-like carbon was found on porous silicon carbonized at temperature and with acetylene flow-rate above critical values.

Creep Behaviour of a Crystallized Si-B-C-N Ceramic Obtained from the Polymeric Precursor T2-1(B[C2H4Si(CH3)NH]3)n

2003 ◽  
Vol 778 ◽  
Author(s):  
N.V. Ravi Kumar ◽  
André Zimmermann ◽  
Fritz Aldinger
Keyword(s):  
Elevated Temperatures ◽  
Deformation Behaviour ◽  
Creep Behaviour ◽  
Organic Polymer ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Temperature Range ◽  
Compression Creep ◽  
Nano Crystalline

AbstractThe boron modified poly(vinyl)silazane polymer precursor with the chemical composition (B[C2H4Si(CH3)NH]3)n was milled and sieved. The polymer particles from different size fractions were compacted using a graphite die in a uni-axial warm pressing machine at a pressure of 48 MPa and in the temperature range 250°C to 330°C. The green bodies were pyrolysed in an argon atmosphere at a temperature of 1300°C when the organic polymer converts into an inorganic amorphous Si-B-C-N ceramic. These amorphous ceramics were annealed under various conditions of temperature, nitrogen overpressure and holding time in order to crystallize them and to produce nano-crystalline microstructures. Compression creep experiments were carried out in atmospheric ambience at loads varying from 5 – 100 MPa and in the temperature range 1350°C – 1500°C to investigate the high temperature deformation behaviour of the crystalline material. The interest is to understand the mechanisms of deformation in these nanocrystalline Si-B-C-N ceramics at elevated temperatures and to compare the results with that of amorphous ceramics. The investigation also includes the determination of viscosity of the material at high temperatures.

Nucleation of Disorder in Fe3Al Alloys

1967 ◽  
Vol 25 ◽  
pp. 312-313
Author(s):  
P. R. Swann ◽  
W. R. Duff ◽  
R. M. Fisher
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Annealing Temperature ◽  
Antiphase Domain ◽  
Effect Of Temperature ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Higher Temperature ◽  
The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

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