Investigation of Phase Transformations in High-Alloy Austenitic TRIP Steel Under High Pressure (up to 18 GPa) by In Situ Synchrotron X-ray Diffraction and Scanning Electron Microscopy

2015 ◽  
Vol 47 (1) ◽  
pp. 95-111 ◽  
Author(s):  
Stephanie Ackermann ◽  
Stefan Martin ◽  
Marcus R. Schwarz ◽  
Christian Schimpf ◽  
Dirk Kulawinski ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Pressure ◽  
Phase Transformations ◽  
Trip Steel ◽  
X Ray Diffraction ◽  
High Alloy ◽  
X Ray ◽  
Scanning Electron

Morphology of Polyethylene/Montmorillonite Nanocomposites Prepared by In Situ Polymerization

2013 ◽  
Vol 457-458 ◽  
pp. 244-247
Author(s):  
Min Li ◽  
Li Guang Xiao ◽  
Hong Kai Zhao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
In Situ Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Reflection Peak ◽  
Basal Reflection ◽  
Scanning Electron

Polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by in situ polymerization. The morphology of MMT/MgCl2/TiCl4 catalyst and PE/MMT nanocomposites was investigated by scanning electron microscopy (SEM). It can be seen that MMT/MgCl2/TiCl4 catalyst remained the original MMT sheet structures and many holes were found in MMT and the morphology of PE/MMT nanocomposites is part of the sheet in the form of existence, as most of the petal structure. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were carried out to characterize all the samples. XRD results reveal that the original basal reflection peak of PEI1 and PEI2 disappears completely and that of PEI3 become very weak. MMT/MgCl2/TiCl4 catalyst was finely dispersed in the PE matrix. Instead of being individually dispersed, most layers were found in thin stacks comprising several swollen layers.

Microstructure of In Situ Reaction TiB2/Zn-30Al-1Cu Composites Prepared by Spray Deposition Process

2015 ◽  
Vol 1120-1121 ◽  
pp. 572-575
Author(s):  
Hong Wei Liu ◽  
Feng Wang ◽  
Qiang Zhang ◽  
Xi Wu Li ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Spray Deposition ◽  
Deposition Process ◽  
Deposition Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Α Phase ◽  
Scanning Electron

An innovative spray deposition technique has been applied to produce in situ TiB2/Zn-30Al-1Cu composites. The microstructures of the spray-deposited composite were studied using optical microscopy, scanning electron microscopy, and X-ray diffraction. Both theoretical and experimental results have shown that the TiB2particulates are formed in the microstructure. It was found that the TiB2particles were distributed in Zn-30Al-1Cu matrix uniformly, and the TiB2particles are about 2 μm in size. Moreover, the presence of the TiB2particles was led to increasing of α’ phase with less 2 μm size in the composites which have a tendency to decompose to α+η structure.

Study of Alloys IrxRe1-x (x = 0.65, 0.75 and 0.85)

2013 ◽  
Vol 203-204 ◽  
pp. 55-58 ◽  
Author(s):  
Anton Panchenko ◽  
Tatyana Dyachkova ◽  
Sergey Gromilov ◽  
Yuriy Zaynulin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Ir-Re alloys were synthesized from nanocrystalline iridium and rhenium powders under high pressure (4 GPa) und temperature (2000° C). They were characterized using powder X-ray diffraction and scanning electron microscopy.

Electro-Less Ni-P Plating Coating of In Situ TiCp/Al-4.5wt.%Cu Vomposites

2015 ◽  
Vol 817 ◽  
pp. 593-598
Author(s):  
Yan Feng Liang ◽  
Sheng Quan Dong ◽  
Gao Hong Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Citric Acid ◽  
Optical Microscopy ◽  
X Ray Diffraction ◽  
Citric Acid Concentration ◽  
X Ray ◽  
In Situ Tic ◽  
Scanning Electron

In situ TiCp/Al-4.5wt.%Cu composites have been coated using an electro-less Ni-P plating technique. The morphology and composition of the plating coating have been examined by scanning electron microscopy, optical microscopy, and X-ray diffraction. The results indicated that the coating had a high-phosphorus amorphous microstructure. The coatings microstructures showed significantly changes when the citric acid concentration in the chemical bath was varied in the range 16-20g/L.

Oxidation of Micro-Sized Spherical Aluminium Particles

2011 ◽  
Vol 696 ◽  
pp. 290-295 ◽  
Author(s):  
Vladislav Kolarik ◽  
Maria del Mar Juez-Lorenzo ◽  
Harald Fietzek
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxidation Behaviour ◽  
X Ray Diffraction ◽  
Oxide Formation ◽  
X Ray ◽  
Isothermal Conditions ◽  
Heating Up ◽  
Scanning Electron

Micro-sized spherical Al particles have recently attracted interest for the development of a new concept for coatings based on their capability to form hollow alumina spheres and aluminized diffusion zones in the substrate. For understanding better their oxidation behaviour, spherical µm-Al particles with different sizes were oxidized in air on heating up to 1300°C and under isothermal conditions at 800°C and 850°C. The oxide formation was studiedin situby high temperature X-ray diffraction and the oxidised particles were analysed by scanning electron microscopy. On heating the µm-Al particles begin to form a g-Al2O3scale before reaching the melting point and the molten Al is kept within the g-Al2O3shell. On further heating q-Al2O3is detected, which forms simultaneously with the g-Al2O3. The g-Al2O3/ q-Al2O3scale is stable and protective under isothermal conditions up to 800°C within the investigated times. On further heating the g-Al2O3and q-Al2O3transform simultaneously to a-Al2O3in a temperature range of 850°C to 1100°C. Under isothermal conditions the g à a-Al2O3transformation is observed after 160 min at 850°C. During the g à a-Al2O3transformation shrinkage occurs that leads to formation of pores. A model is proposed describing the mechanism that leads to the formation of the observed whiskers morphologies during the g à a-Al2O3transformation.

Study on Synthesis Nanomicrostructures of Zinc Borate (Zn3B6O12•3.5H2O) with Different Morphologies

2011 ◽  
Vol 236-238 ◽  
pp. 1687-1691 ◽  
Author(s):  
Hui Ren ◽  
You Ming Cao ◽  
Zhou Qiao Lei
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Raw Materials ◽  
Average Length ◽  
Zinc Borate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The crystal zinc borate (Zn3B6O12·3.5H2O) nano-strips and nano-flakes were successfully prepared by a wet method using boric acid (H3BO3) and Zn(NO3)2·H2O as raw materials in situ aqueous solution, and triethanolamine as the modifying agent. The nano/microstructures and morphologies of the as-obtained samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectrometer (EDS) and thermogravimetric analysis (TGA). It had been found that the as-prepared materials displayed nanostrips with average length from 100 to 200nm and the thicknesses about 30nm as well as nanoflakes with diameter about 4μm and thickness about several nanometers morphology.

Synthesis and Character of Amphiphobic Calcium Carbonate Nanoparticles In Situ

2011 ◽  
Vol 295-297 ◽  
pp. 1675-1679
Author(s):  
Chang Yu Liu ◽  
Shu Liang Wang ◽  
Jian Li ◽  
Cheng Yu Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Samples ◽  
Ft Ir ◽  
Crystal Type ◽  
Contact Angle Analysis ◽  
Scanning Electron

Amphiphobic vaterite with a size of about 50 nm, was prepared via crystallization of CaCO3with perfluorooctane surfapropyl betaine（DF-921）in methanol by mimicking the process of biomineralization. The products were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and contact angle analysis. The results indicate that the CaCO3powder samples had both hydrophobic and oleophobic properties. The DF-921 used in this research not only controlled the crystal type of the CaCO3particles but also changed the surface properties of the final products.

Synthesis and Decomposition of Ti3SiC2 under 1-5GPa at 1400°C

2014 ◽  
Vol 602-603 ◽  
pp. 499-502 ◽  
Author(s):  
Yuan Yuan Zhu ◽  
Shang Sheng Li ◽  
Liang Li ◽  
Ai Guo Zhou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Pressure ◽  
Phase Transformation ◽  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ternary Carbide ◽  
Scanning Electron

Ternary carbide Ti3SiC2 is a good binder to make superhard composites with diamonds or cubic boron nitride. Superhard composites are normally made at high temperature and under high pressure around 5 GPa to avoid the phase transformation of diamonds or cubic boron nitride. This paper researched the synthesis of Ti3SiC2 from the powders of Ti, Si, and graphite by a cubic presser under 1 GPa to 4 GPa at 1400°C. The decomposition of Ti3SiC2 under 5GPa at 1400°C was also researched. From X-ray diffraction (XRD) and scanning electron microscopy (SEM) results, Ti3SiC2 was synthesized in 30 min under 1 GPa at 1400°C. The impurities were TiSi2, Ti5Si3Cx, and TiC. As the pressure increased from 1GPa to 4GPa, less Ti3SiC2 more TiSi2 was synthesized. Therefore, high presser > 1GPa is unfavorable for the synthesis of Ti3SiC2. After treated under 5GPa at 1400°C, pure Ti3SiC2 was decomposed.

scholarly journals Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands

RSC Advances ◽  
2019 ◽  
Vol 9 (26) ◽  
pp. 14727-14735 ◽  
Author(s):  
Long Wen ◽  
Xuebing Zhou ◽  
Deqing Liang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Methane Hydrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cryogenic Scanning Electron Microscopy ◽  
Decomposition Behaviour ◽  
Scanning Electron

In this work, the decomposition behaviour of methane hydrate in porous media was investigated microscopically using powder X-ray diffraction, cryogenic scanning electron microscopy and in situ Raman spectroscopy.

scholarly journals Novel Strategy for Synthesis of ZnO Microparticles Loaded Cotton Fabrics and Investigation of their Antibacterial Properties

2011 ◽  
Vol 6 (3) ◽  
pp. 155892501100600 ◽  
Author(s):  
Sunil Kumar Bajpai ◽  
Varsha Thomas ◽  
Manjula Bajpai
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antibacterial Properties ◽  
Cotton Fabrics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrothermal Approach ◽  
Novel Strategy ◽  
Scanning Electron

In this work, ZnO microparticles were in situ in the chitosan – attached cotton fabric following ‘equilibration – cum - hydrothermal’ approach to yield zinc oxide microparticles loaded cotton (ZOMLC) fabrics. The ZnO microparticles were characterized by surface plasmon resonance (SPR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The ZOMLC fabric showed fair antibacterial action against model bacteria E.coli.

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