scholarly journals Fabrication of TiB2–Al1050 Composites with Improved Microstructural and Mechanical Properties by a Liquid Pressing Infiltration Process

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1588
Author(s):  
Seongmin Ko ◽  
Hyeonjae Park ◽  
Yeong-Hwan Lee ◽  
Sangmin Shin ◽  
Ilguk Jo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Metal Matrix ◽  
Load Transfer ◽  
Volume Fraction ◽  
High Volume ◽  
Matrix Composites ◽  
Infiltration Process ◽  
Al Composite ◽  
Al Matrix

This study was conducted on titanium diboride (TiB2) reinforced Al metal matrix composites (MMCs) with improved properties using a TiB2 and aluminum (Al) 1050 alloy. Al composites reinforced with fine TiB2 at volume ratios of more than 60% were successfully fabricated via the liquid pressing infiltration (LPI) process, which can be used to apply gas pressure at a high temperature. The microstructure of the TiB2–Al composite fabricated at 1000 °C with pressurization of 10 bar for 1 h showed that molten Al effectively infiltrated into the high volume-fraction TiB2 preform due to the improved wettability and external gas pressurization. In addition, the interface of TiB2 and Al not only had no cracks or pores but also had no brittle intermetallic compounds. In conclusion, TiB2–Al composite, which has a sound microstructure without defects, has improved mechanical properties, such as hardness and strength, due to effective load transfer from the Al matrix to the fine TiB2 reinforcement.

Enhanced tensile properties of weight-reduced nanoporous carbon nanotube-aluminum composites

2019 ◽  
Vol 9 (7) ◽  
pp. 801-807
Author(s):  
Myung Eun Suk
Keyword(s):  
Mechanical Properties ◽  
High Volume ◽  
Nanoporous Carbon ◽  
Atomic Scale ◽  
Matrix Composites ◽  
Large Size ◽  
Al Composite ◽  
Density Analysis ◽  
Al Matrix Composites ◽  
Al Matrix

In this study, the mechanical properties of light nanoporous Carbon nanotubes (CNT)-Aluminum (Al) composites were investigated using atomistic tensile simulations. High volume fractions of large size CNT were embedded in Al matrix composites to reduce the weight of Al by 23%. The lightweight CNT-Al composite exhibited enhanced mechanical properties, including 105.8, 246.9 and 243.7% improvement for tensile strength, fracture toughness, and elastic modulus, respectively. The decomposition of total stress into its CNT and Al matrix components indicated enhanced elastic properties were due to the shear interaction between CNT and Al in addition to the great load bearing capacity of CNT. By performing dislocation density analysis, it was discovered that the large dislocation storage capability of nanoporous CNT-Al enhanced ductility when compared to pure Al. This study demonstrates the high potential of nanoporous CNT-Al as a lightweight and strong, yet tough material, and it also provides atomic scale understanding of the mechanical behavior of CNT-Al nanocomposite.

Damping and Mechanical Properties of (Graphite + 9Al2O3·2B2O3)/Mg Metal Matrix Composites

2004 ◽  
Vol 449-452 ◽  
pp. 657-660
Author(s):  
Il Dong Choi ◽  
Dong Min Kim ◽  
Kyung Mok Cho ◽  
Ik Min Park
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Damping Capacity ◽  
High Temperature Strength ◽  
Al Alloy ◽  
Matrix Composites ◽  
Graphite Particles

Mg alloys have potential to use automotive parts because of their weight and castability. High temperature strength and damping capacity is important to the automotive power train parts. Mg alloy has lower creep and thermal fatique strength but has better damping capacity than Al alloy. It is known that short fiber reinforced Mg metal matrix composites(MMC) exhibits superior high temperature strength and graphite reinforced Mg MMC shows excellent damping capacity. Therefore, in this study, the effect of graphite particles(15-25%) and alborex (9Al2O3ּ2B2O3) whiskers(5-15%) on the damping behavior and mechanical properties of Mg MMC was studied. Graphite particles and alborex whiskers were chosen to increase damping capacity and high temperature strength, respectively. The Mg MMC was fabricated by squeeze casting and the total quantity of reinforcements(graphite + alborex) was maintained to 30 volume percent. The damping capacity of the metal matrix composites was increased and the flexural strength and hardness were decreased with increasing the volume fraction of graphite particles, that is, reducing the volume fraction of alborex whiskers.

High Volume Fraction Aluminum /Alumina-Fused Silica Hybrid Particulate Metal Matrix Composite

2013 ◽  
Vol 701 ◽  
pp. 3-7
Author(s):  
Ghodratollah Roudini ◽  
Mehdi Asgharian ◽  
Morteza Khosravi
Keyword(s):  
Metal Matrix ◽  
Volume Fraction ◽  
High Volume ◽  
Optical Microscope ◽  
Fused Silica ◽  
High Volume Fraction ◽  
Matrix Composites ◽  
Sem Images ◽  
Composite Microstructure ◽  
Silica Hybrid

High volume fraction Aluminum/alumina-fused silica hybrid metal matrix composites containing alumina with 0, 10, 30 and 50 wt% fused silica were produced by melt squeezing casting method. Microstructure of hybrid composite was investigated by optical microscope and scanning electron microscopy (SEM). The SEM images showed uniform distribution of fused silica particles in composite microstructure. Also compressive strength of the composites changed (310-110 MPa) with amount of fused silica.

Wear Characteristics of Particulate Reinforced Metal Matrix Composites Fabricated by a Pressureless Metal Infiltration Process

2006 ◽  
Vol 510-511 ◽  
pp. 234-237 ◽  
Author(s):  
Jae Dong Kim ◽  
Hyung Jin Kim ◽  
Sung Wi Koh
Keyword(s):  
Wear Resistance ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Wear Loss ◽  
Matrix Composites ◽  
Slow Speed ◽  
Infiltration Process ◽  
Sliding Speed ◽  
Metal Infiltration

The effect of size and volume fraction of ceramic particles with sliding speed on the wear properties were investigated for metal matrix composites fabricated by a pressureless metal infiltration process. The particulate metal matrix composites exhibited about 5.5 - 6 times greater wear resistance compared with AC8A alloys at high sliding speed, and by increasing the particle size and decreasing the volume fraction the wear resistance improved. The wear resistance of the metal matrix composites and AC8A alloy represented different aspects: the wear loss of the AC8A alloy increased with sliding speed linearly, whereas, the metal matrix composites displayed more wear loss than the AC8A alloy in the slow-speed region. However, a transition point of wear loss was found in the middle-speed region, which shows the minimum wear loss. Furthermore, wear loss in the high-speed region exhibited almost the same value as the slow-speed region. In terms of wear mechanism, the metal matrix composites showed abrasive wear at a slow to high sliding speed generally. However, the AC8A alloy showed abrasive wear at low sliding speed and adhesive and melt wear at a high sliding speed.

scholarly journals The Reinforcement Mechanisms of Graphene Oxide in Laser Directed Energy Deposition Fabricated Metal and Ceramic Matrix Composites: A Comparison Study

2021 ◽  
Author(s):  
Yunze Li ◽  
Dongzhe Zhang ◽  
Zhipeng Ye ◽  
Gaihua Ye ◽  
Rui He ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
High Temperature ◽  
Metal Matrix ◽  
Energy Deposition ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Directed Energy ◽  
Carbon Based Nanomaterials

Abstract Carbon-based nanomaterials mainly including carbon nanotubes (CNTs), graphene, and graphene oxide (GO) have superior properties of low density, outstanding strength, and high hardness. Compared with ceramic reinforcements, a small amount of carbon-based nanomaterials can significantly improve the mechanical properties of metal matrix composites (MMCs) and ceramic matrix composites (CMCs). However, CNTs and graphite always aggregate or degrade during the fabrication with a high temperature, especially in MMCs. GO has the advantages of easier to be dispersed in other materials and better high-temperature stability. Laser directed energy deposition (DED), has been used to fabricate GO-MMCs and GO-CMCs due to the unique capabilities of coating, remanufacturing, and producing functionally graded materials. Laser DED, as a fusion manufacturing process, could fully melt the material powders, which could refine the microstructure and increase the density and mechanical properties. However, GO could react with matrix materials at high temperatures. The survival, degradation, and reactions of GO in laser DED fabricated GO-MMCs and GO-CMCs are still unknown. There is also no investigation on the reinforcement mechanisms of GO in metal matrix materials and ceramic matrix materials in the laser DED process. In this study, GO reinforced Ti (GO-Ti) and GO reinforced zirconia toughened alumina (GO-ZTA) parts were fabricated by laser DED process. Raman spectrum, XRD analysis, and EDS analysis have been applied to investigate the forms of GO in both DED fabricated GO-MMCs and GO-CMCs. The reinforcement mechanisms of GO on microhardness and compressive properties of MMCs and CMCs have been analyzed.

Effects of Particle Size and Volume Fraction on Extrusion Texture of SiCp/Al Metal Matrix Composites

2011 ◽  
Vol 194-196 ◽  
pp. 1437-1441 ◽  
Author(s):  
Chun Lin He ◽  
Jian Ming Wang ◽  
Qing Kui Cai
Keyword(s):  
Particle Size ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Matrix Composites ◽  
Texture Intensity ◽  
Sic Particles ◽  
Al Matrix

The texture development was investigated in the extruded Al and Al metal matrix composites (MMCs) reinforced with SiC particles of different sizes and volume fractions. During extrusion, both the unreinforced Al and the MMCs develop a strong fiber texture with two components: <111> and <100>. When SiC is introduced into aluminum, the main component of texture is not modified, but the intensity of the component evolves with the volume fraction and average size of SiC particles. For the MMCs reinforced with 3.5μm SiC particles, the texture intensity of the Al matrix tends to decrease as the SiC volume fraction increases, and it is lower than that in the unreinforced Al. However, for the MMCs reinforced with 25 nm and 150 nm SiC particles, the texture intensity of the Al matrix is higher than that in the unreinforced matrix, and it increases with increasing the SiC volume fraction. It is found that superfine particles may introduce some new component into the deformation texture, and the texture intensity increases as the SiC particle size decreases.

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