Comparative Study of Al/TiB2 Composites Manufactured by Underwater and Direct Shock Wave Consolidation

2011 ◽  
Vol 673 ◽  
pp. 231-236 ◽  
Author(s):  
H. Eskandari ◽  
H.M. Ghasemi ◽  
M. Emamy ◽  
Kazuyuki Hokamoto
Keyword(s):  
Shock Wave ◽  
Bending Strength ◽  
Volume Fraction ◽  
Direct Method ◽  
Particle Volume Fraction ◽  
Aluminum Matrix ◽  
Tib2 Particle ◽  
Aluminum Matrix Composites ◽  
Particle Volume ◽  
Tib2 Particles

Aluminum matrix composites containing of 10, 20 and 30 vol% TiB2 particles were compacted by underwater and direct shock wave consolidation methods. SEM and Optical Microscopic examination, hardness and bending strength measurements were used to characterize the samples. It is observed that there were different distributions of TiB2 particles in recovered compacts by each method. In the direct method, the distribution of TiB2 particles at the center and at the periphery of the sample was different whereas in the underwater method there was a uniform microstructure in the sample. The microhardness of the compacts increased with increasing TiB2 particle volume fraction in both methods. The results showed highest bending strength for the composite containing 20 vol% TiB2 particles.

Effects of Particle Volume Fraction on Dynamic Deformation Behaviors of B4C Reinforced Aluminum Matrix Composites

2012 ◽  
Vol 535-537 ◽  
pp. 110-116
Author(s):  
Xian Feng Li ◽  
Bin Liu ◽  
Wen Mao Huang ◽  
Hao Wei Wang
Keyword(s):  
Flow Stress ◽  
Fracture Surface ◽  
Volume Fraction ◽  
Failure Strain ◽  
Particle Volume Fraction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Dynamic Behaviors ◽  
Size Grading

Particles size grading method was employed to fabricate aluminum matrix composites reinforced with 75% volume fraction B4C particles by squeeze casting. Dynamic behaviors of the composite was investigated and compared with 55 vol. % composite which were reinforced with particles of uniform size. The results showed that the flow stress increased but the fracture strain decreased with increasing reinforcement volume fraction. Furthermore, the dynamic behaviors of 55 vol. % composite were significantly affected by adiabatic heating softening which was demonstrated by the local melted matrix on the fracture surface and an increase-decrease tendency on flow stress and failure strain was obtained with increasing impact velocity. However, due to load redistribution caused by particles size grading, no melted region was found on the fracture surface and no increase-decrease tendency on flow stress and failure strain was observed for 75 vol. % composites under the same impact loading.

An investigation into the wear behaviour of TiB2 particle reinforced aluminium composites produced by mechanical alloying

2011 ◽  
Vol 18 (1-2) ◽  
pp. 5-12 ◽  
Author(s):  
Dursun Ozyurek ◽  
Ibrahim Ciftci
Keyword(s):  
Mechanical Alloying ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
A356 Alloy ◽  
Tib2 Particle ◽  
Wear Behaviour ◽  
Wear Loss ◽  
Mechanically Alloyed ◽  
Particle Volume ◽  
Alloy Matrix

AbstractIn this study, wear behaviour of TiB2 particle reinforced aluminium (Al) composites produced by the mechanical alloying method was investigated. TiB2 ceramic particles of four different volume fractions were mechanically alloyed with Al and A356 alloy matrix materials. The mechanically alloyed particles were cold presses and then sintered at 550°C. After the sintering process, the composites were characterised through hardness measurements, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Wear tests were also carried out on a pin-on-disc type wear apparatus under 10, 25 and 50 N loads. Wear loss of the composites were found to decrease with increasing hardness which increased with increasing TiB2 particle volume fraction. However, increasing the applied load and sliding distance increased the wear loss. Wear surface examinations showed that various wear mechanisms were effective in wear of the composites.

Interaction of a Shock Wave With a Dense Corrugated Particle Curtain

2017 ◽  
Author(s):  
Bertrand Rollin ◽  
Marie Desenlis
Keyword(s):  
Shock Wave ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Initial Perturbation ◽  
Point Particle ◽  
Planar Geometry ◽  
Late Time ◽  
Initial Particle ◽  
Particle Volume ◽  
Initial Shape

A numerical experiment studying the gas-particle variant of the Richtmyer-Meshkov instability is presented. Using an Eulerian-Lagrangian approach, namely point particle simulations, we track trajectories of computational particles composing an initially corrugated particle curtain, after the curtain’s interaction with a shock wave. We solve the compressible multiphase Euler equations in a two-dimensional planar geometry and use state-of-the-art particle force models, including unsteady forces, for the gas-particle coupling. However, additional complexities associated with compaction of the curtain of particles to random close packing limit and beyond are avoided by limiting the simulations to relatively modest initial volume fraction of particles. At a fixed Mach number, we explore the effects of the initial perturbation amplitude, initial particle volume fraction and initial shape on the dispersal of the particle curtain. For this shock strength, our simulations suggests that the amplitude of the initial perturbation does not play a significant role in the late time particle dispersal, contrary to the volume fraction. Higher initial particle volume fraction tend to faster particles dispersal. Finally, higher frequency initial perturbations seem to be absorbed by lower frequency initial perturbations.

scholarly journals Cold Forming of Al-TiB2 Composites Fabricated by SPS: A Computational Experimental Study

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3456 ◽  
Author(s):  
Elad Priel ◽  
Nissim U. Navi ◽  
Brigit Mittelman ◽  
Nir Trabelsi ◽  
Moshe Levi ◽  
...  
Keyword(s):  
Yield Stress ◽  
Damage Mechanics ◽  
Mechanical Response ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Continuum Damage Mechanics ◽  
Tib2 Particle ◽  
Particle Volume ◽  
Cold Forming ◽  
Effective Yield

The mechanical response and failure of Al-TiB2 composites fabricated by Spark Plasma Sintering (SPS) were investigated. The effective flow stress at room temperature for different TiB2 particle volume fractions between 0% and 15% was determined using compression experiments on cylindrical specimens in conjunction with an iterative computational methodology. A different set of experiments on tapered specimens was used to validate the effective flow curves by comparing experimental force–displacement curves and deformation patterns to the ones obtained from the computations. Using a continuum damage mechanics approach, the experiments were also used to construct effective failure curves for each material composition. It was demonstrated that the fracture modes observed in the different experiments could be reproduced in the computations. The results show that increasing the TiB2 particle volume fraction to 10% results in an increase in material effective yield stress and a decrease in hardening. For a particle volume fraction of 15%, the effective yield stress decreases with no significant influence on the hardening slope. The ductility (workability) of the composite decreases with increasing particle volume fraction.

Underwater Explosive Consolidation of Mechanically Milled Al/TiB2 Composites

2011 ◽  
Vol 673 ◽  
pp. 137-142 ◽  
Author(s):  
H. Eskandari ◽  
Kazuyuki Hokamoto
Keyword(s):  
Bending Strength ◽  
Aluminum Matrix ◽  
High Energy ◽  
Optical Microscope ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Before And After ◽  
Explosive Consolidation ◽  
Tib2 Particles ◽  
Al Matrix

Aluminum matrix composites containing10, 20 and 30vol%TiB2 particles were manufactured by underwater shock consolidation method. High energy ball milling was used to produce a homogenous Al matrix composite reinforced by TiB2 powders. Microstructures of recovered compacts were examined by optical microscope. Sintering of the compacts was carried out at 400 C for 70 minutes. Density, hardness and bending strength of the compacts were measured before and after sintering treatment. The sintered composite samples showed better improvement in the bending strength and deflection The sintered Al matrix samples with 20vol%TiB2 showed highest bending strength and high deflection. SEM fractography examination was used for analysis of fracture surfaces of the compacts.

Effect of Titanium Carbide Particles on Mechanical Properties of Aluminum Matrix Composites

2017 ◽  
Vol 5 (2) ◽  
pp. 20-30
Author(s):  
Zaman Khalil Ibrahim
Keyword(s):  
Mechanical Properties ◽  
Titanium Carbide ◽  
Compression Strength ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Carbide Particles ◽  
Properties Of Composites

In this research aluminum matrix composites (AMCs) was reinforced by titanium carbide (TiC) particles and was produced. Powder metallurgy technique (PM) has been used to fabricate AMCs reinforced with various amounts (0%, 4%, 8%, 12%, 16% and 20% volume fraction) of TiC particles to study the effect of different volume fractions on mechanical properties of the Al-TiC composites. Measurements of compression strength and hardness showed that mechanical properties of composites increased with an increase in volume fraction of TiC Particles. Al-20 % vol. TiC composites exhibited the best properties with hardness value (97HRB) and compression strength value (275Mpa).

scholarly journals Performance improvement of double-tube gas cooler in CO2 refrigeration system using nanofluids

2015 ◽  
Vol 19 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Jahar Sarkar
Keyword(s):  
Performance Improvement ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Cooling Capacity ◽  
Inlet Temperature ◽  
Refrigeration Cycle ◽  
Particle Volume ◽  
Transcritical Carbon Dioxide ◽  
The Given ◽  
Theoretical Analyses

The theoretical analyses of the double-tube gas cooler in transcritical carbon dioxide refrigeration cycle have been performed to study the performance improvement of gas cooler as well as CO2 cycle using Al2O3, TiO2, CuO and Cu nanofluids as coolants. Effects of various operating parameters (nanofluid inlet temperature and mass flow rate, CO2 pressure and particle volume fraction) are studied as well. Use of nanofluid as coolant in double-tube gas cooler of CO2 cycle improves the gas cooler effectiveness, cooling capacity and COP without penalty of pumping power. The CO2 cycle yields best performance using Al2O3-H2O as a coolant in double-tube gas cooler followed by TiO2-H2O, CuO-H2O and Cu-H2O. The maximum cooling COP improvement of transcritical CO2 cycle for Al2O3-H2O is 25.4%, whereas that for TiO2-H2O is 23.8%, for CuO-H2O is 20.2% and for Cu-H2O is 16.2% for the given ranges of study. Study shows that the nanofluid may effectively use as coolant in double-tube gas cooler to improve the performance of transcritical CO2 refrigeration cycle.

A simulation and experimental study on particle volume fraction of PMMA suspension in centrifugal fields

2021 ◽  
Author(s):  
Yosephus Ardean Kurnianto Prayitno ◽  
Tong Zhao ◽  
Yoshiyuki Iso ◽  
Masahiro Takei
Keyword(s):  
Experimental Study ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Particle Volume
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