Abstract
The goal of this research is to improve the mechanical properties such as strength, hardness and wear resistance for automotive application such as brake shoe and bearings due to high cycle, load and impact during their usage. Therefore, another alloying element or reinforcement addition is necessary. In this work, the composites are made by ADC 12 (Al-Si aluminum alloy) as the matrix and reinforced with micro SiC through stir casting process and TiB is added various from (0.04, 0.06, 0.15, 0.3 and 0.5) wt.% that act as grain refiners and 5 wt.% of Mg is added to improve the wettability of the composites. The addition of TiB improves the mechanical properties because the grain becomes finer and uniform, and the addition of Mg makes the matrix and reinforce have better adhesion. The results obtained that the optimum composition was found by adding 0.15 wt.% of TiB with tensile strength improve from 98 MPa to 136.3 MPa, hardness from 35 to 53 HRB and wear rate reduced from 0.006 2 mm3 s−1 to 0.002 3 mm3 s−1 respectively.
Highlights
Aluminum has been widely used in manufacture industries due to its mechanical properties such as an excellence corrosion resistant, good thermal and electrical conductivity, and light weighted [1]
The size of the particles results in strong interphase and great distribution compared to macro-sized silicon carbide particles due to its large surface area contact
Titanium boron added to this study which acts as grain refiner that can enlarge the surface area of grain boundaries and lead a strengthening mechanism to happen [5]
Summary
Aluminum has been widely used in manufacture industries due to its mechanical properties such as an excellence corrosion resistant, good thermal and electrical conductivity, and light weighted [1]. Because of its softness and ductility, aluminum needs to be combined with other materials to fulfil the higher demand of high strength, wear resistance and toughness for further application like on automotive industry. Titanium boron added to this study which acts as grain refiner that can enlarge the surface area of grain boundaries and lead a strengthening mechanism to happen [5]. Fabrication of this composite is through stir casting method which 3 volume fraction of silicon carbide particle, variation [(0.04, 0.06, 0.15, 0.3, and 0.5) wt.%] of titanium boron and 5 wt.% of magnesium is mixed with molten ADC 12 by mechanical stirring [6]
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