scholarly journals Microstructure Characterization of Nanocrystalline Ni50Ti50 Alloy Prepared Via Mechanical Alloying Method Using the Rietveld Refinement Method Applied to the X-Ray Diffraction

2017 ◽  
Vol 15 (3) ◽  
pp. 401-416 ◽  
Keyword(s):  
Mechanical Alloying ◽  
Rietveld Refinement ◽  
Microstructure Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Refinement Method

Portland Cement for the Cementing of Oil Wells Developed with the Aid of the Rietveld Refinement Method

2014 ◽  
Vol 805 ◽  
pp. 350-355
Author(s):  
Danielle Nascimento Silva Oliveira ◽  
Gelmires Araújo Neves ◽  
Ulisses Targino Bezerra ◽  
Alexsandra C. Chaves ◽  
B. Silveira Lira
Keyword(s):  
Linear Programming ◽  
Portland Cement ◽  
Rietveld Refinement ◽  
Polycrystalline Materials ◽  
Oil Well ◽  
X Ray Diffraction ◽  
X Ray ◽  
Refinement Method ◽  
Low Levels

The use of the Rietveld refinement method has been highlightened as essential in the characterization of polycrystalline materials. With the aid of this method, combined with the application of the X-ray diffraction, it was possible to develop a type of cement that can temporarily substitute the Portland cement for Oil well. This cement was developed from the mixture of Portland cements commonly found in the market. The cements were passed through various sieves, then characterized by X-ray diffraction, being identified the main phases (C3A, C4AF, C3S and C2S) and quantified by the Rietveld refinement method. With the values obtained in the quantification of the phases, a new cement was made through the method of linear programming. From the results, it was possible to conclude that the developed cement presented a composition (levels of the main phases) that satisfies the requirements of NBR 9831, mainly in relation to the low levels of C3A.

Characterization of Ni75Mo25 Alloy Prepared by Mechanical Alloying and Heat Treatment

2013 ◽  
Vol 203-204 ◽  
pp. 394-397
Author(s):  
Joanna Panek ◽  
Bożena Bierska-Piech ◽  
Jolanta Niedbała
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Weight Ratio ◽  
Milling Process ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
Powder Synthesis ◽  
X Ray ◽  
Microscopy Techniques

The process of Ni75Mo25powder synthesis via mechanical alloying (MA) was studied. Process was carried out from pure elements: Ni and Mo with a particle size under 150 μm. A ball-to-powder weight ratio and the rotational speed were 5:1 and 500 rpm, respectively. Oxidation was reduced by milling under an argon atmosphere. The milling process was performed during up to 60 hours. X-ray diffraction (XRD) and scanning electron microscopy techniques have been used to investigate resulting products. It was found that the particle sizes decrease with the increase in milling time. The resulting powder consists of metastable Ni(Mo) and Mo(Ni) solid solutions. Milled Ni75Mo25 powder was subjected to heat treatment at temperature of 773K, 973K and 1173K. As a result of annealing the formation of Ni4Mo and NiMo intermetallic phases was observed.

Investigation of Creep Behavior of CNT Reinforced Ti6Al4V Under Dynamic Loads

2020 ◽  
Vol 42 (1) ◽  
pp. 70-70
Author(s):  
Ismail Topcu Ismail Topcu ◽  
Burcu Nilg n etiner Burcu Nilg n etiner ◽  
Arif N G ll o lu and zkan G lsoy Arif N G ll o lu and zkan G lsoy
Keyword(s):  
Mechanical Alloying ◽  
Creep Behaviour ◽  
Matrix Alloy ◽  
X Rays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eds Analysis ◽  
Hardness Tests ◽  
Materials Used

This study investigates the effects of addition of Carbon nanotube (CNT) at different volume ratios (0.5- 5%) into Ti6Al4V matrix by mechanical alloying in terms of the density, microstructure, hardness and creep under dynamic load. As a result of the good bonding of carbon nanotubes powders with the main matrix, Ti-6Al-4V/CNT composites have experienced change both in microstructure and mechanical properties (such as hardness, density) and, correspondingly, qualitatively creep behaviour of Ti-6Al - 4V matrix alloy has been improved compared to the lean one. The density of CNT reinforced Ti6Al4V composites sintered at 1300and#176;C for 3h decreases with increasing CNT content. The hardness tests indicated that the hardness of composites increased with CNT addition. In addition, although creep strain is decreased continually with CNT content until 5%, creep life increased with increasing CNT content until 4% of CNT but decreased above 4%. After sintering at 1300 and#176;C under vacuum for 3 hours the density of the composite material reached to a level of 98.5 %, the microhardness to 538 HV and the creep behaviour was improved. The characterization of Ti6Al4V / CNT composites after mechanical alloying was carried out using scanning electron microscopy (SEM), energy dispersive x-rays spectroscopy (EDS) analysis and X-ray diffraction (XRD) methods. Although Ti–6Al–4V alloys are used as biomaterial, this study aimed at using MWCNTs containing Ti-6Al-4V composites at high temperature applications. Because MWCNTs reinforced Ti-6Al-4V composites are cheaper and have lower weight than the other materials used in this kind of applications.

Structural characterization of La2−xMxCuO4 (M = Sr,Ba) samples by synchrotron x-ray and neutron powder diffraction techniques

1988 ◽  
Vol 3 (6) ◽  
pp. 1327-1335 ◽  
Author(s):  
D. E. Cox ◽  
S. C. Moss ◽  
R. L. Meng ◽  
P. H. Hor ◽  
C. W. Chu
Keyword(s):  
High Resolution ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Structural Characterization ◽  
Neutron Powder Diffraction ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Neutron Data ◽  
X Ray

High-resolution synchrotron x-ray powder diffraction studies on samples of La2−xMxCuO4 (M = Sr,Ba) prepared by standard ceramic techniques show that macroscopic compositional inhomogeneities may exist that are unlikely to be revealed by conventional x-ray diffraction methods. Rietveld refinement of neutron data collected at 200, 50, and 11 K from one such sample, nominally La1.8Sr0.2CuO4, gave satisfactory fits to a tetragonal structure of K2NiF4 type at all three temperatures. However, careful individual peak fits revealed that part of the sample transforms to orthorhombic between 200 and 50 K. It is suggested that this multiphase character has an important influence on the superconducting properties.

Characterization of Cordierite Glass with the Addition Colorant Ceramic Glaze for FIR Therapy

2016 ◽  
Vol 840 ◽  
pp. 207-212
Author(s):  
Lim Yi Xuan ◽  
Johar Banjuraizah ◽  
Zainal Arifin Ahmad
Keyword(s):  
High Hardness ◽  
Structural Refinement ◽  
X Ray Diffraction ◽  
Porosity Level ◽  
X Ray ◽  
Refinement Method ◽  
Cordierite Glass ◽  
Crystallization Of Glass ◽  
Rietveld Structural Refinement

α-Cordierite glass ceramic was synthesised through crystallization of glass compacts made of milled glass frits. The effect of temperatures and colorants were studied. The crystal structure of α-cordierite was analysed using X-ray diffraction technique and Rietveld structural refinement method. Density, porosity and shrinkage analysis, Vickers hardness and SEM were also performed. The result revealed that at higher sintering temperatures, the properties of α-cordierite was getting better. Low apparent porosity level and high hardness dense α-cordierite was fabricated at temperature 1350oC. The low porosity level may lead to high thermal conductivity which suggested that cordierite was candidates for FIR therapy instrumemts.________________________________________________________________________

Microstructure Characterization of Multilayer Thin Coatings ZrN/Si3 N4 by X-Ray Diffraction Using Noncoplanar Measurement Geometry

2017 ◽  
Vol 215 (5) ◽  
pp. 1700670
Author(s):  
Svetlana Vlasenko ◽  
Andrei Benediktovitch ◽  
Alex Ulyanenkov ◽  
Vladimir Uglov ◽  
Grégory Abadias ◽  
...  
Keyword(s):  
Microstructure Characterization ◽  
X Ray Diffraction ◽  
Thin Coatings ◽  
X Ray ◽  
Measurement Geometry

Microstructure characterization of IG110 and reactor pebble graphite using synchrotron micro X‐ray diffraction 2D maps

2020 ◽  
Vol 53 (1) ◽  
pp. 90-99
Author(s):  
Zhoutong He ◽  
Can Zhang ◽  
Hui Tang ◽  
Ming Liu ◽  
Barry J. Marsden ◽  
...  
Keyword(s):  
Microstructure Characterization ◽  
X Ray Diffraction ◽  
X Ray

Formation of Nanostructured Ni-TaC and Fe-TaC Composite Powders via Mechanical Alloying

2016 ◽  
Vol 257 ◽  
pp. 179-182
Author(s):  
Aydin Şelte ◽  
Burak Özkal
Keyword(s):  
Mechanical Alloying ◽  
Tantalum Carbide ◽  
Strain Rates ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Plot Analysis ◽  
Hall Plot ◽  
Crystallite Sizes

In this study, mixtures of 25 wt.% of tantalum carbide (TaC) and iron (Fe) or nickel (Ni) powders were mechanical alloyed against time in order to investigate the interactions between the reinforcement (harder TaC particles) and surrounding ductile metallic matrixes (Fe and Ni). After mechanical alloying, apparent densities and particle size and distribution (PSD) of the powders were measured and morphological observations were realized via scanning electron microscopy (SEM). X-ray diffraction (XRD) was applied for phase analysis and with increasing mechanical alloying time certain shifts were observed for the two theta values of the samples. These data used for characterization of strain rates and crystallite sizes by fundamentals parameters approach applied with Lorentzian function and Williamson-Hall plot analysis.

scholarly journals Characterization of nickel doped Zn7Sb2O12 spinel phase using Rietveld refinement

2003 ◽  
Vol 18 (3) ◽  
pp. 219-223 ◽  
Author(s):  
L. Gama ◽  
C. O. Paiva-Santos ◽  
C. Vila ◽  
P. N. Lisboa-Filho ◽  
E. Longo
Keyword(s):  
Crystal Structure ◽  
Rietveld Refinement ◽  
Spinel Phase ◽  
Pechini Method ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Precursor Method ◽  
X Ray

Zn7Sb2O12 is known to adopt an inverse spinel crystal structure, in which Zn2+ occupies the eight tetrahedral positions and Sb5+ and Zn2+ randomly occupy the 16 octahedral positions. Samples of Zn7−xNixSb2O12 (x=0, 1, 2, 3, and 4) were synthesized using a modified polymeric precursor method, known as the Pechini method. The crystal structure of the powders was characterized by Rietveld refinement with X-ray diffraction data. The results show that for x=0, 1, and 2 Ni substitutes for Zn2+ in the octahedral sites, and that for x=3 and 4 it is assumed that Ni2+ replaces Zn2+ ions in both the octahedral and tetrahedral positions. It is also observed for x=3 and 4 the formation of two spinel phases.

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