Nanocomposites of AA 2024 aluminum alloy matrix reinforced with nano-sized MoSi2 particles were produced using mechanical alloying method followed by cold and hot pressing. Phase stability analysis, hardness, and room temperature compression tests of the composites were performed. In addition, absorb energy calculation and fracture behavior evaluation of the compression test specimens were carried out. The results indicated that the composite constituents exhibit good stability during the high temperature processing. The hardness and compressive strength of the composites show a steady increase for nano-sized MoSi2 particle contents up to 3 vol.% and exceed values of 150 HB and 800 MPa, respectively followed by a small drop at higher contents, most probably due to the particle agglomeration. Fractographic investigations of compression test specimens revealed that the failure mode of the composites with lower amount of reinforcement is mainly dimple ductile fracture while, with increasing the reinforcement...
Last. Sukru Ozsahin(Karadeniz Technical University)H-Index: 11
view all 3 authors...
Abstract In the present study artificial neural network (ANN) approach was used for the prediction of effect of physical and mechanical properties of Al2024–B 4 C composites produced by powder metallurgy. Effects of reinforcement size and content (wt.%) on the physical and mechanical properties of composites were determined by measuring the density, hardness and tensile strength values. Density, hardness and tensile values strength of the composites were the outputs obtained from the proposed AN...
In this study, Al2024-B4C composites containing 0, 5, 10 and 20 wt% of B4C particles with two different particle sizes (d50=49 μm and d50=5 μm) as reinforcement material were produced by a mechanical alloying method. Two new particle distribution models based on the size of reinforcement materials was developed. The microstructure of the Al2024-B4C composites was investigated using a scanning electron microscope. The effects of reinforcement particle size and weight percentage (wt%) on the physi...
In the present work, the effect of milling parameters on the morphology and microstructure of nanostructure Al2024–B4C composite powders obtained by mechanical alloying (MA) was studied. The effects of milling time and B4C content on the morphology, microstructure and particle size of nanostructure Al2024–B4C composite powders have been investigated. Different amounts of B4C particles (0, 5, 10 and 20 wt.%) were mixed with Al2024 powders and milled in a planetary ball mill for 30, 60, 120, 300, ...
Last. Massoud Emamy(UT: University of Tehran)H-Index: 25
view all 3 authors...
Nano-sized MoSi2 powder was produced successfully from commercially available MoSi2 by a mechanical milling process carried out for 100 h, and mechanical alloying was employed to synthesize AA 2024-MoSi2 nanocomposites. The effects of MoSi2 reinforcement and mechanical milling on the structure, morphology, and iron contamination of the produced materials were investigated using X-ray diffraction, scanning electron microscopy, and atomic absorption spectrometry. It is revealed that the morphology...
AbstractIn this study, an Al–10 wt-%Al2O3 composite powder prepared by mechanical alloying was investigated at different milling times. To evaluate the effects of the amount of methanol as a process control agent on the characteristics of mechanical alloyed Al–Al2O3 composite powder and the properties of the composite materials, the composite powders and the composite materials have been successfully produced with different amounts of methanol, namely, 1, 2 and 3 wt-%. The composite powders were...
In this study, mechanochemical reactions in the ternary system of Al–B2O3–C were investigated. The starting materials were activated in a planetary ball mill under Argon atmosphere at different times. X-Ray diffraction and scanning electron microscopy (SEM) methods were used to characterize the products. The results showed that B4C, AlB12, and Al2O3 were formed at least after 4 h of milling. Furthermore, an aluminum borate (9Al2O3.2 B2O3) compound was formed during an aluminothermic reaction, as...
In this article, the experimental results of the mechanical and tribological properties of Al7075–SiC composites are presented. The composites of Al7075 containing 2–6 wt% SiC were fabricated by liquid metallurgy route. The experimental results showed that the density of the composites increase with increased SiC contents and are in line with the values obtained by the rule of mixtures. The hardness and tensile strength of the Al7075–SiC composites are found to be increased by increased volume p...
#1J. Corrochano(CSIC: Spanish National Research Council)H-Index: 6
#2Marcela Lieblich(CSIC: Spanish National Research Council)H-Index: 18
Last. Joaquín Ibáñez(CSIC: Spanish National Research Council)H-Index: 20
view all 3 authors...
Abstract Six hot extruded Al–Mg–Si composites reinforced with 15 vol.% of MoSi 2 intermetallic particles were processed by powder metallurgy, varying reinforcement size and high energy ball milling time. The relation between these parameters and matrix microstructure, final reinforcement size and particle distribution has been investigated. Reinforcement distribution was quantified through the coefficient of variation of the mean near-neighbour distance, COV( λ m ), which demonstrated to be the ...
#1C. Suryanarayana(UPM: King Fahd University of Petroleum and Minerals)H-Index: 1
Abstract Nanocomposites were synthesized by the solid-state powder processing technique of mechanical alloying in Al–Al 2 O 3 , TiAl–Ti 5 Si 3 , and MoSi 2 –Si 3 N 4 systems. The mechanically alloyed powders were consolidated to full density by techniques such as vacuum hot pressing, hot isostatic pressing, and combinations of them. The as-milled powders as well as the consolidated compacts were characterized for their crystal structure features using X-ray diffraction and for the microstructura...
Nanocomposites of 2024 aluminum–MoSi2 were prepared using mechanical alloying method followed by cold and hot pressing. Influences of volume fraction and distribution of nanosized MoSi2 reinforcement on mechanical properties of the composites were investigated. Microstructural characterization was carried out by scanning electron microscopy and energy dispersive spectroscopy. Mechanical properties of the nanocomposites were evaluated via hardness, wear, and also room and high temperature compres...
