Effects of particle size on magnetostrictive properties of magnetostrictive composites with low particulate volume fraction

2009 ◽  
Author(s):  
Xufeng Dong ◽  
Xinchun Guan ◽  
Jinping Ou
Keyword(s):  
Particle Size ◽  
Volume Fraction ◽  
Particulate Volume Fraction ◽  
Magnetostrictive Composites ◽  
Particulate Volume

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.

MEASUREMENT OF PARTICULATE VOLUME FRACTION IN A COFLOW DIFFUSION FLAME USING TRANSIENT THERMOCOUPLE TECHNIQUE

2004 ◽  
Vol 176 (5-6) ◽  
pp. 945-958 ◽  
Author(s):  
A. Rolando ◽  
A. D'Alessio ◽  
A. D'Anna ◽  
C. Allouis ◽  
F. Beretta ◽  
...  
Keyword(s):  
Diffusion Flame ◽  
Volume Fraction ◽  
Coflow Diffusion Flame ◽  
Particulate Volume Fraction ◽  
Particulate Volume

The modelling of the growth of soot particles during the pyrolysis and partial oxidation of aromatic hydrocarbons

1981 ◽  
Vol 377 (1769) ◽  
pp. 119-145 ◽  
Keyword(s):  
Condensed Phase ◽  
Volume Fraction ◽  
Growth Models ◽  
Scattered Light ◽  
Incident Shock ◽  
Optical Absorption Coefficient ◽  
Wide Range ◽  
Particulate Volume Fraction ◽  
Condensational Growth ◽  
Particulate Volume

Previous light-scattering studies on aerosols generated by hydrocarbon pyrolysis in incident shock flows have shown, given a constant particulate volume fraction, that the observed scattered-light intensities agree very closely with those predicted for the free-molecular coagulation of an aerosol having a self-preserving size distribution. One crucial obstacle to the extension of this simple model to include condensational growth has been the measurement of how the particulate volume fraction changes with time. For, not only does the condensed phase contain both soot (which absorbs infrared radiation) and molecular nuclear aromatic species (which do not), but this latter (black) material apparently condenses from the gaseous phase without change in optical absorption coefficient. The approach adopted here has therefore been to generate and test various growth models that span a wide range of assumptions about condensation and nucleation. Only two models, designated COAG and CONCO, can provide quantitative agreement between prediction and observation. Both models require that at any instant the infrared-transparent, light-absorbing polynuclear aromatic intermediates are either all in the gas phase or all in the condensed phase, the switch between the two states corresponding to an instantaneous, massive nucleation step. This interpretation is supported by the marked failure of all growth models based on different assumptions to match the observations. Extensions of the COAG and CONCO models to treat nucleation more realistically give essentially unchanged predictions over substantial domains of assumed initial values of particulate number density and volume fraction. This stability explains why the simple models can correctly describe the results obtained for many shocks spanning a range of temperature, hydrocarbon species and oxygen concentration, where substantial shock-to-shock variations in nucleation rates must exist. At critically low temperatures, with delayed and less rapid nucleation, the CONCO model and extensions thereof must be preferred to the COAG model because they give greater weight to condensational growth.

A General Magneto-Elastic Model of Terfenol-D Particle Actuated Composite Materials

2000 ◽  
Author(s):  
William D. Armstrong
Keyword(s):  
Composite Materials ◽  
Volume Fraction ◽  
Elastic Behavior ◽  
Elastic Model ◽  
Matrix Composites ◽  
Longitudinal Stress ◽  
Composite Matrix ◽  
Uniform External Magnetic Field ◽  
Particulate Volume Fraction ◽  
Particulate Volume

Abstract A new theory is presented of the nonlinear multi-axial magneto-elastic behavior of magnetostrictive particle actuated composite materials. The analysis assumes a uniform external magnetic field is operating on a large number of well distributed, crystallographically and shape parallel ellipsoidal magnetostrictive particles encased in an elastic, nonmagnetic composite matrix. Comparisons between experimental and model magnetostriction results show that the model is able to provide a quantitatively correct dependence on particulate volume fraction and longitudinal stress and quantitatively accurate magnetostriction curves for both homogenous Terfenol-D rod and magnetically ordered Terfenol-D particulate actuated epoxy matrix composites over experimentally applied field ranges.

The Influence of Interfacial and Structural Parameters on the Elastic Modulus of SiCp/6066Al Composites

2007 ◽  
Vol 546-549 ◽  
pp. 653-656
Author(s):  
Fu Sheng Pan ◽  
Wen Ming Wang ◽  
Yun Lu ◽  
Su Min Zeng
Keyword(s):  
Elastic Modulus ◽  
Volume Fraction ◽  
Poisson Ratio ◽  
Structural Parameters ◽  
The Matrix ◽  
Specific Elongation ◽  
Matrix Modulus ◽  
Particulate Volume Fraction ◽  
Optimal Approach ◽  
Particulate Volume

The effects of the interfacial parameters (interface/matrix modulus ratio, interface Poisson ratio and interface volume fraction) and the structural parameters (particulate volume fraction, particulate shape, arrangement pattern and dimensional variance mode) on the elastic modulus of SiCp/6066Al composites were calculated and analyzed. The results showed that component and interface performance significantly influenced the elastic modulus of the composite; but the particulate shape, arrangement pattern and dimensional variance mode were found to have little influence. This means that the effect of the above structural parameters can be negligible. The optimal approach to enhance the elastic modulus and specific elongation of a composite is to improve the interfacial bonding of the particulate. Optimal results are obtained when the interface modulus is 20% ~ 30% of the matrix modulus.

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