Microstructure and Mechanical Properties of In Situ TiB2/6061 Composites

2012 ◽  
Vol 535-537 ◽  
pp. 14-17
Author(s):  
Long Hua Zhong ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Rong Wen
Keyword(s):  
Master Alloy ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
X Ray ◽  
Mixing Method ◽  
Particulate Volume Fraction ◽  
Ti Powder ◽  
Particulate Volume

In situ TiB2/6061 composites have been successfully synthesized through chemical reaction between 6061 master alloy, Al-3B master alloy and Ti powder. The composites fabricated by direct melt mixing method was investigated by Scanning Electron Microscope (SEM), Energy Dispersive x-ray Spectroscopy (EDS) and X-Ray Diffraction (XRD), The results shown the existence of TiB2particles. The size of most TiB2particles were just in micron level, and even reached to sub-micron level. The increase in microhardness and tensile strength for the as-prepared composites with 5% particulate volume fraction (PVF) are up to 26.8% and 51.2% respectively.

In situ x-ray observation of bainitic transformation of austempered silicon alloyed steel

2009 ◽  
Vol 24 (4) ◽  
pp. 1559-1566 ◽  
Author(s):  
Xiang Chen ◽  
Esa Vuorinen
Keyword(s):  
Volume Fraction ◽  
Early Stage ◽  
Bainitic Ferrite ◽  
Bainitic Transformation ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
Heterogeneous Distribution ◽  
X Ray ◽  
Austempering Temperature

The in situ x-ray diffraction observations of the bainitic transformation were conducted by using the high-temperature x-ray diffraction technique. The volume fraction and carbon content of austenite depend on the transformation temperature. The d{110} value of bainitic ferrite decreases with increasing austempering temperature, which is related to the decrease of carbon concentration in bainitic ferrite. Asymmetry diffraction peaks are obtained for samples at the early stage of transformation at any austempering temperatures. This asymmetry diffraction peak after the formation of bainitic ferrite could be attributed to a heterogeneous distribution of carbon in different regions of austenite and show that two types of austenite with different carbon contents, low-carbon austenite (γLC) and the high-carbon austenite (γHC), exist during the transformation. The microstructure after cooling down to room temperature is presented to show the effectiveness of the x-ray diffraction analysis.

In Situ Synchrotron Analysis of Twinning Stresses in an Aged Mg-4.5Zn Alloy

2018 ◽  
Vol 941 ◽  
pp. 1579-1584 ◽  
Author(s):  
Mahmoud Reza Ghandehari Ferdowsi ◽  
Jun Wang ◽  
Sitarama R. Kada ◽  
Zhi Yang Wang ◽  
Peter A. Lynch ◽  
...  
Keyword(s):  
Yield Strength ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
Aged Condition ◽  
X Ray ◽  
Peak Broadening ◽  
Strong Relation ◽  
Twin Volume Fraction ◽  
Zn Alloys

Aging increases the yield strength of aged Mg-Zn alloys. The effect of aging on the stress required for twinning is examined using in-situ transmission based synchrotron X-ray diffraction. The as extruded material was aged at variety of temperatures for different times. It is found that increasing sample diameter (thickness) results in peak broadening. The data are analysed to establish the evolution of twin volume fraction with stress. Results indicated an increase in twinning stress at 10% twin volume fraction in aged samples in comparison with non-aged condition. The investigation showed a strong relation between the macroscopic yield stress and the twinning stress (at 10% twin volume fraction).

Structure and Properties of Hydrogenated Nitrile-Butadiene Rubber/Organo Montmorillonite Nanocomposites

2011 ◽  
Vol 110-116 ◽  
pp. 3818-3824
Author(s):  
Xiao Ping Wang ◽  
De Min Jia ◽  
An Min Huang
Keyword(s):  
Crosslinking Density ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
X Ray Diffraction ◽  
Melt Mixing ◽  
X Ray ◽  
Nitrile Butadiene Rubber ◽  
Aging Properties ◽  
Mixing Method ◽  
Higher Temperature

Organo-montmorillonite (OMMT) was compounded with Hydrogenated Nitrile-Butadiene Rubber （HNBR）(50% epoxidation) to prepare nanocomposites by melt mixing method. The nanometer scales of organoclays in rubber matrix were determined by X-ray diffraction testing, the exfoliated/intercalated structures of OMMT in HNBR were confirmed by transmission elector microscopy. The increases in tensile module and strength of HNBR/OMMT nanocomposites vulcanizaters were caused by the better interactions between rubber macromolecule chains and organoclay layers. The air-aging properties of nanocomposites enhanced by the increasing content of OMMT, which was leaded by the barrier characterize of nanodisperse OMMT layers. DMA test showed that the Tgs of HNBR/OMMT shifted to a higher temperature, as verified by the crosslinking density determination.

Evaluation of Tri-Axial Magnetostriction in Cube-Oriented Fe-Ga Single Crystal by Using X-Ray Diffraction Method

2017 ◽  
Vol 909 ◽  
pp. 300-305 ◽  
Author(s):  
Takehito Ikeuchi ◽  
Akihiro Koyama ◽  
Muneyuki Imafuku ◽  
Shun Fujieda ◽  
Yusuke Onuki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Volume Fraction ◽  
Diffraction Method ◽  
Diffraction Measurement ◽  
Magnetic Field Direction ◽  
Magnetic Domains ◽  
X Ray Diffraction ◽  
X Ray

We carried out in situ tri-axial magnetostriction analysis for cube-oriented Fe-18%Ga single crystal by X-ray diffraction measurement under magnetic field. Periodic change in tri-axial magnetostriction with applied magnetic field direction was clearly observed. However, those values in [100] and [010] directions were not equivalent. Theoretical calculation of magnetostriction considering domain structure revealed this is caused by the non-equivalent volume fraction of initial magnetic domains.

Microstructure of In Situ Particles/7055Al Matrix Composites with Deep Cryogenic Treatment

2012 ◽  
Vol 217-219 ◽  
pp. 114-118 ◽  
Author(s):  
Xun Yin Zhang ◽  
Gui Rong Li ◽  
Ting Wang Zhang ◽  
Lei Cao ◽  
Hong Ming Wang ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Cryogenic Treatment ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Deep Cryogenic Treatment ◽  
X Ray ◽  
Diffraction Peaks

Al2O3，Al3Ti and Al3Zr particles reinforced 7055 aluminium matrix composites were fabricated via melt reaction method. The volume fraction is controlled at about 4-5%. After extrusion and solution-aging heat treatment the sample was prepared for deep cryogenic treatment, The microstructure and evolution of mechanical properties of (Al3Ti+Al3Zr)p/7055 composites were analyzed using optical microscopy(OM),scanning electronic microscopy(SEM) and X-ray diffraction(XRD). Some θ(Al2Cu) phases with nanometer size precipitate in the inner grain. As some grains preferred orient the intensity of some main diffraction peaks increase. Compared with those of as-cast and squeezed states the micro hardness has increased by 16.8% and 10.0% separately.

scholarly journals In Situ X-Ray Diffraction during Casting: Study of Hot Tearing in Al-Zn Alloys

2015 ◽  
Vol 1120-1121 ◽  
pp. 1134-1141 ◽  
Author(s):  
Jean Marie Drezet ◽  
Bastien Mireux ◽  
Guven Kurtuldu
Keyword(s):  
Volume Fraction ◽  
Solid Phase ◽  
Hot Spot ◽  
Solid Volume Fraction ◽  
Internal Stresses ◽  
X Rays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Alloys

During solidification of metallic alloys, coalescence corresponds to the formation of solid bridges between grains when both solid and liquid phases are percolated. As such, it represents a key transition with respect to the mechanical behaviour of solidifying alloys and to the prediction of solidification cracking. Coalescence starts at the coherency point when the grains begin to touch each other, but are unable to sustain any tensile loads. It ends up at the rigidity temperature when the solid phase is sufficiently coalesced to transmit macroscopic tensile strains and stresses. This temperature, also called mechanical or tensile coherency temperature, is a major input parameter in numerical modelling of solidification processes as it defines the point at which thermally induced deformations start to generate internal stresses in a casting. The rigidity temperature has been determined in Al Zn alloys using in situ X-ray diffraction (XRD) during casting in a dog bone shaped mould. This set-up allows the sample to build up internal stress naturally as its contraction is prevented. The cooling on both extremities of the mould induces a hot spot at the middle of the sample which is irradiated by X-rays. Diffraction patterns were recorded every 0.5 s using a detector covering a 426 x 426 mm2area. The change of diffraction angles allowed us to observe agglomeration/decohesion of growing grain clusters and to determine a solid volume fraction at rigidity around 98 % depending on solidification time for grain refined Al 6.2 wt% Zn alloys.

scholarly journals Effect of Silver (Ag) Addition on the Forming Of Y-247 Superconductors (Y2Ba4Cu7O15-?) using Wet Mixing Method

2019 ◽  
Vol 20 (1) ◽  
pp. 11
Author(s):  
A.A. Made Wisnu Wijaya Putra ◽  
W. G. Suharta ◽  
P. Suardana
Keyword(s):  
Volume Fraction ◽  
Lattice Parameter ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Ag Addition ◽  
X Ray ◽  
Mixing Method ◽  
Parameter Values ◽  
Scanning Electron

Superconductor Y-247 (Y2Ba4Cu7O15-?) with adding silver (Ag) by using the wet-mixing method has been done. The synthesis process was carried out by calcination at 600o C for 3 hours and sintered at 925o C for 10 hours. Variations in the increase in the addition of Ag used were Ag0.05, Ag0.1, Ag0.15 and Ag0.2. Characterization of X-Ray Diffraction (XRD), showed an increase in the addition of Ag resulting in a decrease in the volume fraction, where the volume fractions obtained consecutive were 55.0%, 51.3%, 50.9% and 46.3%. Increasing the addition of Ag results in an increase in the lattice parameter values in the direction of the a axis which is 3.8247 Å, 3.8291 Å, 3.8292 Å, 3.8293 Å, decreasing the lattice parameter values in the b axis direction which is 3.8426 Å, 3.8415 Å, 3.8409 Å, 3.8383 Å and decreasing the lattice parameter values in the direction of the c axis are 49.2174 Å, 49.2022 Å, 49.1881 Å, 49.1761 Å. Analysis of the results of the characterization of Scanning Electron Microscopy (SEM), the particle size obtained was 225.47 nm, 202.88 nm, 190.68 nm and 172.22 nm.

scholarly journals Laboratory X-ray Diffraction Complex for In Situ Investigations of Structural Phase Evolution of Materials under Gaseous Atmosphere

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 447 ◽  
Author(s):  
Maxim Syrtanov ◽  
Georgiy Garanin ◽  
Egor Kashkarov ◽  
Natalia Pushilina ◽  
Viktor Kudiiarov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Hydrogen Pressure ◽  
Structural Phase ◽  
Phase Evolution ◽  
Gaseous Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ti Powder ◽  
Cp Ti

In this work, a laboratory X-ray diffraction complex for in situ investigations of structural phase evolution of materials under gaseous atmosphere and elevated temperatures was developed. The approbation of the complex was carried out using a commercially pure titanium (CP-Ti) powder, zirconium (Zr-1Nb) alloy and electron beam melted Ti-6Al-4V alloy. It was established that hydrogenation of the CP-Ti powder occurred at a temperature of 500 °C and a hydrogen pressure of 0.5 atm, accompanied by the formation of metastable γ titanium hydride (γ-TiH) phase. The lifetime of the γ-TiH phase was 35–40 min. Decomposition of the γ-TiH occurred after reaching a temperature of 650 °C as a result of the thermally stimulated desorption of hydrogen. The α-Zr → δ-ZrH phase transformation was observed under hydrogenation of the zirconium Zr-1Nb alloy at a temperature of 350 °C and a hydrogen pressure of 0.5 atm. It was revealed that the increase in hydrogenation temperature to 450 °C accelerated this transformation by two times. Hydrogenation of the electron beam melted titanium Ti-6Al-4V alloy at a temperature of 650 °C and hydrogen pressure of 0.5 atm was accompanied by the α → α + β → β + α2 phase transformations.

In-Situ Studies of Silicide Formation in Ti-Ta Bilayer Thin Films on Poly-Si

2002 ◽  
Vol 721 ◽  
Author(s):  
A. S. Özcan ◽  
K. F. Ludwig ◽  
C. Lavoie ◽  
C. Cabral ◽  
J. M. E. Harper
Keyword(s):  
Volume Fraction ◽  
Formation Temperature ◽  
Silicide Formation ◽  
X Ray Diffraction ◽  
Template Effect ◽  
Elastic Light Scattering ◽  
Time Resolved ◽  
X Ray ◽  
Si Substrates

AbstractWe have studied the formation of titanium silicides in the presence of an ultra-thin layer of Ta, interposed between Ti and Si. In-situ x-ray diffraction (XRD), resistance measurements and elastic light scattering were used to study the thin film reactions in real time during ramp anneals to 1000°C. On poly-Si substrates the Ta thickness was varied from 0 to 1.5 nm while the Ti thickness was held constant at ∼27 nm. The time-resolved XRD shows that the volume fraction of C40 and metal-rich silicide phases grows with increasing Ta layer thickness. Increased Ta layer thicknesses also delay the growth of the C49 disilicide phase to higher temperatures. Among the Ta thicknesses we examined, 0.3 nm is the most effective in lowering the C49-C54 transformation temperature. Films with Ta layers thicker than 0.5 nm do not completely transform into the C54 phase. The texture of the C54 phase is also sensitive to the Ta thickness. The C54 disilicide film is predominantly (010) textured for the Ti / 0.3 nm Ta sample. The final C54 texture is significantly different for Ta layers thinner or thicker than the optimal 0.3 nm. This suggests that the most effective thickness for lowering the C54 formation temperature is related to the development of a strong (010) texture. The possibility of a template effect by the C40 or metal-rich Ti5Si3 phases is also discussed on the basis of texture considerations.

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