The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

Low Energy Ar Ion Milling of FIB TEM Specimens from 14 nm and Future FinFET Technologies

2018 ◽  
Author(s):  
C.S. Bonifacio ◽  
P. Nowakowski ◽  
M.J. Campin ◽  
M.L. Ray ◽  
P.E. Fischione
Keyword(s):  
Field Effect Transistor ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Specimen Preparation ◽  
Ion Milling ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Effect Transistor ◽  
20 Nm ◽  
Argon Ion

Abstract Transmission electron microscopy (TEM) specimens are typically prepared using the focused ion beam (FIB) due to its site specificity, and fast and accurate thinning capabilities. However, TEM and high-resolution TEM (HRTEM) analysis may be limited due to the resulting FIB-induced artifacts. This work identifies FIB artifacts and presents the use of argon ion milling for the removal of FIB-induced damage for reproducible TEM specimen preparation of current and future fin field effect transistor (FinFET) technologies. Subsequently, high-quality and electron-transparent TEM specimens of less than 20 nm are obtained.

Transmission Electron Microscope Specimen Preparation of Metal Matrix Composites Using the Focused Ion Beam Miller

2000 ◽  
Vol 6 (5) ◽  
pp. 452-462 ◽  
Author(s):  
Julie M. Cairney ◽  
Robert D. Smith ◽  
Paul R. Munroe
Keyword(s):  
Electron Microscope ◽  
Metal Matrix Composites ◽  
Transmission Electron Microscope ◽  
Metal Matrix ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Matrix Composites ◽  
Transmission Electron ◽  
The Matrix ◽  
Ceramic Reinforcement

AbstractTransmission electron microscope samples of two types of metal matrix composites were prepared using both traditional thinning methods and the more novel focused ion beam miller. Electropolishing methods were able to produce, very rapidly, thin foils where the matrix was electron transparent, but the ceramic reinforcement particles remained unthinned. Thus, it was not possible in these foils to study either the matrix-reinforcement interface or the microstructure of the reinforcement particles themselves. In contrast, both phases in the composites prepared using the focused ion beam miller thinned uniformly. The interfaces in these materials were clearly visible and the ceramic reinforcement was electron transparent. However, microstructural artifacts associated with ion beam damage were also observed. The extent of these artifacts and methods of minimizing their effect were dependent on both the materials and the milling conditions used.

Structural and Chemical Properties of MBE Grown Niobium Overlayers on (110) Rutile

1996 ◽  
Vol 441 ◽  
Author(s):  
J. Marien ◽  
T. Wagner ◽  
M. Rühle
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Defect Structure ◽  
Chemical Properties ◽  
High Energy ◽  
Initial Growth ◽  
High Energy Electron ◽  
Transmission Electron ◽  
Different Temperatures ◽  
And Chemical Properties

AbstractThin Nb films were grown by MBE in a UHV chamber at two different temperatures (50°C and 950°C) on the (110) surface of TiO2 (rutile).At a growth temperature of 50°C, reflection high energy electron diffraction (RHEED) revealed epitaxial growth of Nb on rutile: (110)[001] TiO2 ¦¦ (100)[001] Nb. In addition, investigations with Auger electron spectroscopy (AES) revealed that a chemical reaction took place between the Nb overlayer and the TiO2 substrate at the initial growth stage. A 2 nm thick reaction layer at the Nb/TiO2 interface has been identified by means of conventional transmission electron microscopy (CTEM) and high-resolution transmission electron microscopy (HRTEM).At a substrate temperature of 950°C, during growth, the Nb film was oxidized completely, and NbO2 grew epitaxially on TiO2. The structure and the chemical composition of the overlayers have been investigated by RHEED, AES, CTEM and HRTEM. Furthermore, it was determined that the reaction of Nb with TiO2 is governed by the defect structure of the TiO2 and the relative oxygen affinities of Nb and TiO2.

Investigation of Tensile Property of Aluminium SiC Metal Matrix Composite

2015 ◽  
Vol 766-767 ◽  
pp. 252-256 ◽  
Author(s):  
A. Siddique Ahmed Ghias ◽  
B. Vijaya Ramnath
Keyword(s):  
Composite Material ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Matrix Material ◽  
Chemical Properties ◽  
High Strength ◽  
Stir Casting ◽  
The Matrix ◽  
Hybrid Metal Matrix Composite

The composite material is a combination of two or more materials with different physical and chemical properties. The composite has superior characteristics than those individual components. A hybrid composite is the one which contains at least three materials. When the matrix material is a metal, the composite is termed as metal matrix composites (MMC). The MMC is a composite material with two constituent parts, one being a metal. The other material may be another metal, ceramic or fiber. Among all the MMC’s, Aluminium is the most widely used matrix material due to its light weight, high strength and hardness. This paper deals with the fabrication and mechanical investigation of hybrid metal matrix composite Al - SiC. The fabrication is done by stir casting by adding the required quantities of additives into the stirred molten Aluminium. The results show significant effect of mechanical properties such as tensile strength, yield stress and flexural strength. The internal structure of the composite is observed using Scanning electron microscope (SEM) and found that are formation of pores in them.

scholarly journals Effect of TiO2 Concentration on Thermal Stability and Dielectric Properties of (PANI)1-x(TiO2)x Nanocomposites

2019 ◽  
Vol 31 (4) ◽  
pp. 855-859
Author(s):  
Ajay Kumar Sharma ◽  
Praveen Kumar Jain ◽  
Rishi Vyas ◽  
Vipin Kumar Jain
Keyword(s):  
Thermal Stability ◽  
Dielectric Properties ◽  
Optoelectronic Devices ◽  
Chemical Properties ◽  
Rutile Phase ◽  
Sem Images ◽  
Xrd Pattern ◽  
The Matrix ◽  
Structural Surface ◽  
And Chemical Properties

The current paper deals with investigation of (PANI)1-x(TiO2)x nanocomposites to explore possible material for optoelectronic devices. To investigate the effect of TiO2 concentration on structural, surface morphology and chemical properties of PANI, samples were characterized by XRD, FTIR, SEM and Raman spectroscopy. The XRD pattern evidence the presence of a blend of anatase and rutile phase of TiO2 within the PANI matrix which shows amorphous nature of the matrix. FTIR and Raman spectra confirm the formation of PANI/TiO2 nanocomposites. SEM images show the appearance of lumps into smooth PANI samples with addition of TiO2 nanoparticles. The thermal and dielectric properties were studied using TGA and Impedance analyzer, respectively. The results showed that the addition of TiO2 improves the thermal stability, which clearly shows its potential application in optoelectronic devices.

Matrix degradation regulates osteoblast protrusion dynamics and individual migration

2019 ◽  
Vol 11 (11) ◽  
pp. 404-413
Author(s):  
Nieves Movilla ◽  
Clara Valero ◽  
Carlos Borau ◽  
Jose Manuel García-Aznar
Keyword(s):  
Chemical Properties ◽  
Matrix Metalloproteinase Inhibitor ◽  
Surrounding Environment ◽  
Cell Velocity ◽  
The Matrix ◽  
3D Matrix ◽  
A Cell ◽  
Degradation Activity ◽  
Good Agreement ◽  
And Chemical Properties

Abstract Protrusions are one of the structures that cells use to sense their surrounding environment in a probing and exploratory manner as well as to communicate with other cells. In particular, osteoblasts embedded within a 3D matrix tend to originate a large number of protrusions compared to other type of cells. In this work, we study the role that mechanochemical properties of the extracellular matrix (ECM) play on the dynamics of these protrusions, namely, the regulation of the size and number of emanating structures. In addition, we also determine how the dynamics of the protrusions may lead the 3D movement of the osteoblasts. Significant differences were found in protrusion size and cell velocity, when degradation activity due to metalloproteases was blocked by means of an artificial broad-spectrum matrix metalloproteinase inhibitor, whereas stiffening of the matrix by introducing transglutaminase crosslinking, only induced slight changes in both protrusion size and cell velocity, suggesting that the ability of cells to create a path through the matrix is more critical than the matrix mechanical properties themselves. To confirm this, we developed a cell migration computational model in 3D including both the mechanical and chemical properties of the ECM as well as the protrusion mechanics, obtaining good agreement with experimental results.

Influence of P2O5 and Al2O3 on Mineral Formation in Converter Slag

2013 ◽  
Vol 477-478 ◽  
pp. 1273-1277
Author(s):  
Zhi Hao Deng
Keyword(s):  
Converter Slag ◽  
Chemical Properties ◽  
Dicalcium Silicate ◽  
Cement Industry ◽  
Physical And Chemical Properties ◽  
Mineral Formation ◽  
The Matrix ◽  
Complex Chemical Composition ◽  
Physical And Chemical ◽  
And Chemical Properties

Converter Slag is a by-product during steelmaking. Reusing the slag as Portland cement material can be regarded as a way to reduce environmental pollution. However, the poor grindability caused by complex chemical composition of the slag makes it very difficult to be used in cement industry. To better understand its grindability, the mineral characteristic of converter slag was investigated in this paper. Experimetal slags of CaO-MgO-SiO2-Fe2O3, CaO-MgO-SiO2-Fe2O3-P2O5 and CaO-MgO-SiO2- Fe2O3-P2O5-Al2O3 were synthetized according to physical and chemical properties of actual converter slag. The mineral structures of these slags were analyzed by SEM and EDS. The results show that actual and synthetic slags have mainly three mineral, where dicalcium silicate with little phosphorus presented dark gray, periclase presented black and the matrix phase of dicalcium ferrite. Moreover, phosphorus largely dissolves in the 2CaO∙SiO2 in the form of 3CaO∙PO4, and the other minerals don’t contain phosphorus. A Little aluminum has a little influence on the mineral formation of the slag.

Mechanical Property of Brucite Fiber Reinforced Composite Material

2013 ◽  
Vol 357-360 ◽  
pp. 1019-1022 ◽  
Author(s):  
Bo Wen Guan ◽  
Shuan Fa Chen ◽  
Kai Ping Liu
Keyword(s):  
Mechanical Property ◽  
Composite Material ◽  
Chemical Properties ◽  
Reinforce Concrete ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Reinforced Composite Material

In this paper, microstructure of brucite fiber was introduced briefly and its physical and chemical properties were given. Disperse method of fiber applied in concrete has been introduced. The effect of compressive strength, flexural strength of concrete and cement mortar by the addition of brucite fiber have also been discussed. The mechanism that fiber can reinforce concrete has been discussed. The results showed that the diameter of brucite fiber changes from micrometer scales to nanometer dimension with the dispersing action of water reducers. Brucite fiber can exert its high tensile strength on concrete and improve the mechanical property of cement motar and concrete. Life of bructie fiber reinforced composite material can be prolonged by the addition of brucite fiber.

Influence of the Surfactant on the CdTe Nanomaterials Morphology

2011 ◽  
Vol 287-290 ◽  
pp. 294-297
Author(s):  
Cui Zhi Dong ◽  
Li Fang Zhang ◽  
Xiao Yan Wang ◽  
Ming Xi Zhang ◽  
Zhi Min Cui ◽  
...  
Keyword(s):  
Room Temperature ◽  
Chemical Properties ◽  
Semiconductor Materials ◽  
Alkaline Condition ◽  
Microemulsion System ◽  
X Ray ◽  
Cdte Nanoparticles ◽  
Ctab Concentration ◽  
Transmission Electron ◽  
And Chemical Properties

Because of the good photoelectric learning properties and chemical properties, CdTe nanocrystalline as an important Ⅱ-Ⅵ clan semiconductor materials has been used in LEDs, photonics, in aspects of materials and biomarker and so on. W/O microemulsion method has the peculiarity of tester simpleness, easy manipulation, room temperature react etc. In this paper CdTe nanoparticles was synthesized in CTAB/cyclohexane/isobutanol/water quatemary microemulsion system in alkaline condition and nitrogen. The morphology of the final products were characterized by X-ray power diffraction, transmission electron microscopy. according to the means, this paper researches the effect of surfactant contentration to morphology. The result is that the different morphology can be obtained through the different CTAB concentration. Finally, according to TEM chart, this paper infers the formation mechanism of the CdTe.

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