Abstract
This paper presents the results of the comparative study of as cast microstructures and mechanical properties viz yield strength, ultimate tensile strength, elastic modulus, percentage elongation, hardness, percentage porosity and fracture characteristic of 5 wt% SiC and Al2O3 particulate reinforced Al-4% Cu-2.5% Mg matrix composites. These composite materials were prepared through stir casting process. Quantitative metallographic techniques were utilized to determine the average grain size of particles. The microstructures and tensile fracture characteristic of the representative samples of the composites were examined using optical microscope (OM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD) techniques. The experimental results demonstrate a fairly uniform distribution of 50.8 μm Al2O3 and 49.2 μm SiC spherical particles with some clustering in few areas. At the interfaces of Al2O3 and the matrix, MgO and MgAl2O4 were observed. Similarly, Al4C3 was formed at the interfaces between SiC and the matrix. The mechanical property test results revealed that, for the same weight percentage of reinforcement, Al-4% Cu-2.5% Mg/5 wt% SiC composite exhibit a 15.8%, 16.4%, 4.97% and 10.8% higher yield strength, ultimate tensile strength, elastic modulus, and hardness, respectively. On the other hand, even if some porosity was observed in the Al2O3 reinforced composite, the percentage elongation (ductility) was 31% higher than that of SiC rein-forced composite. The tensile specimen of SiC reinforced composite failed in a brittle fashion without neck formation, whereas the Al2O3 reinforced composite failed in a ductile fashion with noticeable neck formation.
Highlights
Industrial technology is growing at a very rapid rate and there is an increasing demand for new materials [1]
This paper presents the results of the comparative study of as cast microstructures and mechanical properties viz yield strength, ultimate tensile strength, elastic modulus, percentage elongation, hardness, percentage porosity and fracture characteristic of 5 wt% SiC and Al2O3 particulate reinforced Al-4% Cu-2.5% Mg matrix composites
The results of our study revealed that for the same volume fraction of particulates, Al-4% Cu-2.5% Mg matrix reinforced with SiC exhibit 15.8%, 16.4%, 4.97% and 10.8% higher 0.2% proof stress, ultimate tensile strength, elastic modulus, and hardness, respectively
Summary
Industrial technology is growing at a very rapid rate and there is an increasing demand for new materials [1]. For example, have very different mechanical properties: Young’s moduli of 70 and 400 GPa, coefficients of thermal expansion of 24 × 10−6 and 4 × 10−6/ ̊C, and yield strengths of 35 and 600 MPa, respectively [4,5] By combining these materials, superior properties such as high strength, high stiffness, high service temperature, high electrical and thermal conductivity, good wear resistance, and low coefficient of thermal expansion can be achieved. Superior properties such as high strength, high stiffness, high service temperature, high electrical and thermal conductivity, good wear resistance, and low coefficient of thermal expansion can be achieved These unique properties of MMCs provide a better option for structural applica-. The intent of the present study is to examine the comparative effects of the addition of 5 wt% SiC and Al2O3 particulate reinforcements on the microstructure and mechanical properties of Al-4% Cu-2.5% Mg matrix
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