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 compression tests. The results showed that although the distribution of low content of MoSi2 nanoparticles in the matrix is homogeneous, with increasing the reinforcement fraction, the tendency of agglomeration is gradually intensified. The addition of reinforcing particles continuously brings a considerable enhancement in the mechanical properties of the matrix alloy but by exceeding a certain amount of the reinforcement fraction, this improvement reduces mainly because of the microstructure inhomogeneity. In addition, the nanocomposite with 3 vol% MoSi2 exhibits the optimum mechanical properties at ambient temperature.
Last. Massoud Emamy(UT: University of Tehran)H-Index: 32
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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 t...
Abstract Nanostructured Al 6061– x wt.% TiC ( x = 0.5, 1.0, 1.5 and 2.0 wt.%) composites were synthesised by mechanical alloying with a milling time of 30 h. The milled powders were consolidated by cold uniaxial compaction followed by sintering at various temperatures (723, 798 and 873 K). The uniform distribution and dispersion of TiC particles in the Al 6061 matrix was confirmed by characterising these nanocomposite powders by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy...
Abstract The mechanical responses of aluminum foam filled braided stainless steel tubes subjected to tensile loading are presented in this manuscript. Testing of these structures was completed using a custom built testing machine. The braided tubular specimens considered in this study were round AISI 301 stainless steel tubes with a wire diameter of 0.51 mm and external nominal diameter of 64.5 mm. Six different foam core configurations were tested, including circular and rectangular foam prisms...
#1Morteza Alizadeh(SUTECH: Shiraz University of Technology)H-Index: 20
#2Mostafa Alizadeh(Graduate University of Advanced Technology)H-Index: 18
Last. Rasool Amini(SUTECH: Shiraz University of Technology)H-Index: 19
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In this study, Al matrix composites reinforced by 7.5 and 15 vol.% B4C particles and also monolithic Al (Al without the B4C particles) were produced by wet attrition milling and subsequent hot forward extrusion processes. The microstructure of the composites, evaluated by scanning electron microscopy (SEM), showed that the B4C particles were properly distributed in the Al matrix. Mechanical properties of the Al/B4C composites and monolithic Al were investigated by tensile, wear and hardness test...
Last. Massoud Emamy(UT: University of Tehran)H-Index: 25
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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...
Last. Wei Cai(HIT: Harbin Institute of Technology)H-Index: 2
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Abstract The strain amplitude-controlled fatigue characteristics of an Al–Si casting alloy and its composite reinforced with 17 vol% Al 2 O 3 fibers (Al–Si/Al 2 O 3 ) are studied at three different temperatures. Both the alloy and the composite showed different degrees of cyclic softening at elevated temperatures. Increasing the temperature, fatigue damage of either the alloy or the composite occurred with varying mode from brittle fracture of silicon particles to their separation from the alumi...
#1Qu Xuanhui(USTB: University of Science and Technology Beijing)H-Index: 13
#2Lin Zhang(USTB: University of Science and Technology Beijing)H-Index: 21
Last. Shubin Ren(USTB: University of Science and Technology Beijing)H-Index: 22
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Abstract Metal matrix composites with high thermal conductivity and tailorable coefficient of thermal expansion are found widespread applications in electronic package and thermal management. The latest advances in manufacturing process, thermal properties and brazing technology of SiC/metal, carbon/metal and diamond/metal composites were presented. Key factors controlling the thermo-physical properties were discussed in detail. The problems involved in the fabrication and the brazing of these c...
#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...
#1J. Corrochano(CSIC: Spanish National Research Council)H-Index: 6
#2John Walker(University of Southampton)H-Index: 18
Last. W.M. Rainforth(University of Sheffield)H-Index: 48
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The effect of the microstructure on the dry sliding wear of six aluminium alloy 6061 matrix composites reinforced with 15 vol.% of MoSi2 particles and two monolithic 6061 alloys processed by powder metallurgy with and without ball milling has been studied. Wear testing was undertaken using pin-on-ring configuration against an M2 steel counterface at 0.94 m/s and normal load of 42, 91 and 140 N. The wear resistance of the aluminium alloys was significantly improved by ball milling and the additio...
Abstract In this study, nanocomposites of AA 2024 aluminum alloy matrix reinforced with different volume fractions of nanometric MoSi 2 intermetallic particles ranging from 0 to 5%, were produced using mechanical alloying technique. For comparison, samples without reinforcing particles and mechanical alloying and a sample with micrometric MoSi 2 particles were also synthesized. The prepared composite powders were consolidated by cold and hot pressing and then heat treated to solution and aged co...
Last. M. Lütfi Öveçoğlu(ITU: Istanbul Technical University)H-Index: 16
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Abstract The purpose of this research is to investigate the dual effect of silicide (MoSi2 or WSi2) and LaB6 reinforcing particles on the microstructural and mechanical properties of Al-7 wt% Si (Al7Si) matrix. Hypoeutectic Al7Si blends prepared from elemental Al and Si powders were mechanically alloyed (MA’d) for 12 h in a planetary ball mill (at 300 rpm). Afterwards, 2 wt% silicide reinforcements (MoSi2 or WSi2) with various particle size distributions (micron, bimodal, submicron) were separat...
The synthesis of Al-matrix composites reinforced with nanocrystalline intermetallic particles of Ni 3 Al was carried out with the Spark Plasma Sintering (SPS) technique. The Al-5%Ni 3 Al powder mixture was sintered by SPS at two different conditions: (i) 450 °C, 47 MPa and 180 s (4M47) and (ii) 520 °C, 16 MPa and 600 s (5M16). The Ni 3 Al particles were obtained by mechanical alloying after a milling time of 1260 ks. The composites show partial decomposition on the Ni 3 Al-Al interface, with the...
#1Hassan Tazari(KNTU: K.N.Toosi University of Technology)H-Index: 2
#2M. H. Siadati(KNTU: K.N.Toosi University of Technology)H-Index: 13
Abstract Aluminum-based nanocomposites have been gaining significant attention due to their light weights, machinability, low coefficient of thermal expansions and high strengths. For these advantages, aluminum-based nanocomposites are widely used in marine and automobile industries. In this study, nanostructured Al5083-based nanocomposites with different percentages of SiC nanoparticles (SiC np ) were synthesized using mechanical milling route, and their mechanical behaviors were examined in co...
