Manufacture of Continuous Metal Matrix Composite Strip Reinforced by Particulate Materials from the Semisolid Processing

2019 ◽  
Vol 285 ◽  
pp. 189-196
Author(s):  
Antonio de Pádua Lima Filho ◽  
Bruno Katsuyoshi Silama Ueda ◽  
Tales Paschoalino de Castro ◽  
Rodrigo Alessandro Nunes de Oliveira
Keyword(s):  
Metal Matrix ◽  
Surface Defects ◽  
Cast Alloy ◽  
Eutectic Structure ◽  
Nucleation Agent ◽  
Alloy Matrix ◽  
Cooling Slope ◽  
Α Phase ◽  
The Matrix ◽  
Graphite Nanoparticles

Strip casting is a new method of producing metal matrix composites. Two-roll melt dragged processing (TRMD-ing) and single-roll melt dragged processing (SRMD-ing) methods were used to study the manufacture of 2-mm-thick composite strips by using PbSn (≈ 11.3 g/cm3) eutectic alloy matrix reinforced with iron (≈ 7.86 g/cm3) powder (≈ 70 μm) at a rate of 0.3 m/s. The metallic powder stored in the feed hopper (≈ 90 g) was pushed during the pouring operation of the cast alloy (≈ 4 kg) at 260 oC on the cooling slope to produce a mixture of metallic slurry and particles to feed the nozzle to be dragged by the lower roll. Various surface defects occurred during processing, such as the failure of the powder particle to be embedded in the matrix by SRMD-ing with and without stirrer into the nozzle, and the rolling up of the strip into the nozzle by TRMD-ing. Graphite nanoparticles formed inside the α-Pb grain revealed a complicate eutectic structure in both the processing methods. The colloidal graphite used to coat the crucible, cooling slope, and nozzle could act as a nucleation agent for preferential centre segregation in the α-Pb grain. This suggests that the graphite nanoparticles functioned as nucleation points in the lead-rich α phase. Thus, another type of composite was formed in the presence of graphite nanoparticles within the lead-rich α-phase surrounded by β-Sn. An electron probe microanalysis and scanning electronic microscopy were used to investigate the composition and distribution and identify the different phases. Several types of particulate reinforcements may be added to the matrix to obtain composites for mechanical, electronic, and magnetic applications using these technologies.

Microstructure Characterization and Mechanical Properties of a Zn and Rare Earth Modified Mg Alloy

2015 ◽  
Vol 727-728 ◽  
pp. 111-114 ◽  
Author(s):  
Li Yuan Sheng ◽  
Fang Yang ◽  
Ting Fei Xi
Keyword(s):  
Mechanical Properties ◽  
Cast Alloy ◽  
Hot Extrusion ◽  
Eutectic Structure ◽  
Crystal Defects ◽  
Treatment Results ◽  
Nanoscale Particles ◽  
Residual Phase ◽  
Heat Treated ◽  
The Matrix

In the present paper, the Mg-Zn-Y-Nd alloy is fabricated by as casting and hot extrusion. Microstructure and mechanical properties of the as-cast, heat treated and hot extruded alloys are investigated. The results exhibit that Mg24Y5 phase with eutectic structure forms in the as-cast alloy, which has an orientation relationship with matrix of . The precipitating phase separates the matrix semi-continuously. The heat treatment results in most precipitates solid soluted into matrix, but there are still some nanoscale particles and residual phase along grain boundary. The hot extrusion refines the microstructure and leads to the formation of stacking faults in the matrix. Compared with the as-cast and heat treated alloy, the hot extruded alloy obtain great improvement in mechanical properties, which should be attributed to the grain refinement, solid solution and fomation of crystal defects

Synthesis, Microstructure, and Mechanical Properties of FeCo-VC Composites

2006 ◽  
Vol 980 ◽  
Author(s):  
Hongbin Bei ◽  
E. P. George
Keyword(s):  
Mechanical Properties ◽  
Cast Alloy ◽  
Tensile Tests ◽  
Eutectic Structure ◽  
Directionally Solidified ◽  
Quaternary Alloys ◽  
The Matrix ◽  
Solid Solution Matrix ◽  
Solution Matrix

AbstractFe-Co-V-C quaternary alloys were drop cast and directionally solidified to obtain an in situ composite. It is found that the fully eutectic structure occurs at a composition of Fe - 40.5Co -10.4V- 8.6C (at. %) in a drop-cast alloy. Directional solidification of this composition in a high-temperature optical floating zone furnace produces a well-aligned microstructure, consisting of sub-micron VC fibers (~19% by volume) embedded in a FeCo-5V solid solution matrix containing ~ 1% C. The temperature dependencies of mechanical properties of this composite were examined by tensile tests and the composite was found to have higher yield strength and lower ductility than the matrix.

The Corrosion Behaviour of Mg Alloy AZ91D/TiCp Metal Matrix Composite

2005 ◽  
Vol 488-489 ◽  
pp. 705-708 ◽  
Author(s):  
Suqiu Jia ◽  
Shu Sheng Jia ◽  
Guangping Sun ◽  
Jun Yao
Keyword(s):  
Metal Matrix ◽  
Corrosion Behaviour ◽  
Galvanic Corrosion ◽  
General Corrosion ◽  
Az91d Alloy ◽  
Alloy Matrix ◽  
Electrochemical Tests ◽  
Alloy Az91d ◽  
The Matrix ◽  
Carbide Particles

The corrosion of a magnesium-based MMC, comprising a AZ91D alloy matrix and 5 vol% titanium carbide particles has been studied in saline environments, using immersion and electrochemical tests. Corrosion was localized initially and developed subsequently into general corrosion , the local corrosion rate of AZ91D/TiCp being faster than diecast AZ91D due to the formation of less protective corrosion products. Galvanic corrosion for AZ91D/TiCp, due to coupling of the matrix and reinforcement, was more severe than diecast AZ91D.

scholarly journals The Study of the Corrosion Behavior of Zinc-Aluminum Alloy Matrix Composite Reinforced with Nanosilica Produced by Stir Casting

2020 ◽  
Vol 38 (3A) ◽  
pp. 375-382
Author(s):  
Fatima A. Adnan ◽  
Niveen J. Abdul Kader ◽  
Mohammed S. Hamza
Keyword(s):  
Metal Matrix ◽  
Dendritic Structure ◽  
Stir Casting ◽  
Zinc Alloy ◽  
Al Alloy ◽  
Unreinforced Alloy ◽  
Alloy Matrix ◽  
Weight Percentage ◽  
Reinforcing Particles ◽  
The Matrix

In this investigation, Zn-Al alloy metal-matrix nano composites that reinforced via various weight percentages (2%, 4%, 6%, and 8%) of nanosilica (SiO2) particles were fabricated applying the technique of stir casting. Behaviors of the corrosion of the unreinforced alloy and reinforced composites were measured utilizing a potentiostat test in a (3.5 wt.% NaCl) salt solution. The optical microscopy was employed to investigate the surface microstructure of the composite. Microstructure analysis manifested that the uniform distributions of the reinforcing particles in the composites are alike, consisting of a dendritic structure of the zinc alloy matrix with an excellent reinforcing particles steady dispersion. The improved results of the corrosion resistance for the metal matrix composites showed an excellent resistance to corrosion than the matrix in the (3.5 wt.% NaCl) solution. Raising the weight percentage of the reinforcement particulates of nansilica (SiO2) reduced the composites rate of corrosion.

scholarly journals Tribological characteristics of Al/SiC/Gr hybrid composites

2018 ◽  
Vol 183 ◽  
pp. 02001 ◽  
Author(s):  
Sandra Veličković ◽  
Slavica Miladinović ◽  
Blaža Stojanović ◽  
Ružica Nikolić ◽  
Branislav Hadzima ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
High Strength ◽  
Tribological Characteristics ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
The Matrix ◽  
Aluminum Metal Matrix Composites

Metal matrix composites (MMCs) are considered as important engineering materials due to their excellent mechanical, as well as tribological properties. When the metal (or alloy) matrix is reinforced with two or more reinforcements, those composites are the so-called hybrid composites. The aluminum metal matrix composites, reinforced with silicon carbide (SiC) and graphite (Gr), are extensively used due to their high strength and wear resistance. The tribological characteristics of such materials are superior to characteristics of the matrix. This research is presenting influence of the load and the graphite and silicon carbide contents the composites’ wear rate and the friction coefficient.

Effects of Grain Refining and Modification on Mechanical Properties and Microstructures of Multielement Al-7.5Si Cast Alloy

2013 ◽  
Vol 312 ◽  
pp. 396-401 ◽  
Author(s):  
Guang Lei Liu ◽  
Nai Chao Si
Keyword(s):  
Mechanical Properties ◽  
Tensile Deformation ◽  
Cast Alloy ◽  
Grain Refining ◽  
Alloy Matrix ◽  
Metal Compounds ◽  
Α Phase ◽  
Dislocation Movement ◽  
Orthogonal Tests ◽  
Small Bone

With orthogonal tests the effects of grain refiners and modifiers, Al-10Sr, rare earth (RE) and Al-Ti-5B, on the mechanical properties of Al-Si alloy for automobile cylinder blocks were studied. The best result occurred when the proportion of refiners and modifiers was Al-10Sr = 0.1wt%, RE = 0.3wt%, Al-5Ti-B = 0.8wt%. With SEM and EDS the as-cast microstructures of materials after grain refining and modification were observed and analyzed. Tiny branch-shaped AlSi phase, thin-striped AlCu phase, new small bone-shaped AlSiMn phase, new leaf-shaped or feathered B(AlCuCe) phase as well as the phases of other metal compounds made the as-cast microstructures more complicated and more compact after grain refining and modification. Some brittle phases reduced in size obviously and distributed in the grain boundaries of plastic α-phase in network, which acted as intercrystalline strengthening to certain degree. During the tensile deformation these brittle phases could reduce the stress concentration, impeded dislocation movement, and then strengthened the alloy matrix. In addition after grain refining and modification the porosity was significantly reduced.

Microstructure Evolution and Mechanical Properties of Mg-7Gd-3Y-1Nd-2Zn-0.5Zr Alloy during Two-Step Homogenization Heat Treatment

2019 ◽  
Vol 950 ◽  
pp. 15-23
Author(s):  
Ting Li ◽  
Zhi Wei Du ◽  
Wei Liu ◽  
Jia Wei Yuan ◽  
Kui Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Microstructure Evolution ◽  
Cast Alloy ◽  
Eutectic Structure ◽  
Second Step ◽  
Lpso Phase ◽  
Homogenization Heat Treatment ◽  
Long Period ◽  
The Matrix

This paper proposes a two-step homogenization heat treatment to dissolve the eutectic structure and long period stacking ordered phase (LPSO) formed during solidification into the α-Mg matrix. The microstructure evolution and mechanical properties of Mg–7Gd–3Y–1Nd–2Zn–0.5Zr alloy during the two-step homogenization heat treatment have been investigated systemically. The results reveal that as-cast alloy is composed mainly of α-Mg, (Mg,Zn)3RE, eutectic phase, stacking fault, block-like LPSO phase and square-shaped compounds rich in RE. The HRTEM results suggest that the block-like long period stacking ordered phase in as-cast alloy is 14H-type rather than 18R structure, and the stacking sequences of the 14H-LPSO phase are ABABACBCBCBCAB. After the first step homogenization of 520°C for 48 h, the eutectic structure has dissolved into the matrix, whereas the 14H-LPSO phase remains in the alloy. To further dissolve the LPSO phase into matrix, the second step homogenization of 540°C for 24h was adopted. After the second-step of homogenization, the residual 14H-LPSO phase has dissolved into the matrix totally. The as-homogenized alloy is composed mainly of α-Mg and square-shaped compounds rich in RE. The tensile tests at room temperature (RT) exhibit that the ultimate tensile strength (UTS), yield strength (YS) and elongation of as-cast alloy are 172 MPa, 128MPa and 2.8%, whereas the UTS, YS and elongation of as-homogenized alloy are 253 MPa, 185 MPa and 8.4, respectively.

Interfacial Reactions in Metal-Matrix Composites

1995 ◽  
Vol 398 ◽  
Author(s):  
J. R. Heffelfinger ◽  
R. R. Kieschke ◽  
C. B. Carter
Keyword(s):  
Electron Microscopy ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Ti Alloy ◽  
Matrix Composites ◽  
Reaction Products ◽  
Alloy Matrix ◽  
Β Phase ◽  
Transmission Electron ◽  
The Matrix

ABSTRACTThe interfacial reaction between Al2O3 (alumina) and a β-Ti alloy has been characterized by transmission electron microscopy, scanning electron microscopy, and X-ray energy-dispersive spectroscopy. Diffusion bonding single-crystal alumina and a β-Ti alloy was found to produce three interfacial regions: a region of intermetallics (Tl3Al and TiAl) located near the alumina interface, an α-Ti region, and a β-Ti region (rich in Mo, the β-phase stabilizer). Of the intermetallics to form, Ti3Al was found to form first and have an aligned, planar interface with the alumina. TiAl formed second and was found to separate grains of Ti3Al and the alumina. Reaction products observed in the diffusion-bonded alumina/β-Ti couples are compared with those observed in metal-matrix composites (MMCs), where a β-Ti alloy matrix is reinforced with alumina fibers. Different coatings used in MMCs are investigated for their ability to prevent the reaction between the matrix and fibers.

Consolidation of Ni60Nb40 Metallic Glass Strips into Metal Matrix Composites

1981 ◽  
Vol 8 ◽  
Author(s):  
S. J. Cytron
Keyword(s):  
Aluminum Alloy ◽  
Metallic Glass ◽  
Metal Matrix ◽  
Matrix Material ◽  
Superplastic Forming ◽  
Zinc Alloy ◽  
Alloy Matrix ◽  
Large Bulk ◽  
The Matrix ◽  
Forming Temperature

ABSTRACTTo fully utilize the promising mechanical properties of metallic glasses, consolidation techniques need to be developed to incorporate them into large bulk forms. This paper describes preliminary results on the consolidation of Ni60Nb40 metallic glass strips into an aluminum alloy matrix. The consolidation was achieved without the degradation of the metallic glass by employing a superplastic aluminum alloy as the matrix material. The consolidations were accomplished at a superplastic forming temperature compatible with the metal matrix material and sufficiently below the critical 650°C crystallization temperature of the Ni60Nb40 metallic glass. Initial studies employed an atuminum − 5% calcium − 5% zinc alloy as the metal matrix material.

Effect of TiC Particulates on the Microstructure and Mechanical Properties of Aluminium-Based Metal Matrix Composite

2014 ◽  
Vol 903 ◽  
pp. 145-150 ◽  
Author(s):  
Sulaiman Suraya ◽  
Shamsuddin Sulaiman ◽  
Ali Munira ◽  
Abdul Aziz Fazilah
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix ◽  
Matrix Material ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Casting Technique ◽  
Silicon Alloy ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Tic Particulates

In this research, metal-matrix composites (MMCs) of aluminium-11.8% silicon alloy matrix reinforced with titanium carbides particulates were fabricated by the casting technique. Aluminium-11.8% silicon alloy is selected as the matrix material and titanium carbide as particulates are mixed in different weight percentages, 5%, 10%, 15% and 20%wt. The cylinder composite castings are made by pouring the composite mixture in copper permanent-molds. The microstructure and mechanical properties of these composite materials were investigated. The effects of reinforced materials on weight percentages addition of particulate on the particulate distribution in aluminium-11.8% silicon alloy composites and SEM observation of the fracture surfaces of tensile tested specimens were deliberate. Moreover, cylinder castings without particulate addition are made and compared with the result based on the properties and microstructural features. It is found that the microstructure and mechanical properties of composites significantly improved by the use of particle reinforced into aluminium alloy.

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