Abstract
The addition of silicon carbide (SiC) as a reinforce in a composite can improve mechanical properties. In this study aluminium ADC 12 (Al-Si-Aluminium Alloy) is treated with an addition of SiC varied from (1; 1.5; 2; 2.5 to 3) vf% and mixed with 0.18 wt% Sr to change the morphology of the silicone eutectic phase and 0.15 wt% titanium boron (TiB) was added as a grain refiner as well as the addition of 5 wt% magnesium (Mg) to increase the wettability. All materials were fabricated by stir cast method. This research is conducted to obtain the candidate material for application in train's brake shoe and bearing. This kind of usage requires high mechanical properties such as wear resistance, thermal resistance, good elastic modulus and lightweight. The composites were characterised by both mechanical properties and microstructure. The result shows that there is an increase in the mechanical properties of aluminium ADC 12 /SiC composite compared to unreinforced with the value of 144 MPa of strength, 53 HRB of hardness, and 0.0049 mm3 m–1 of wear rate. As a result, the higher addition of the SiC results in the better mechanical properties for the composite.
Highlights
The composites are different from the metal alloys, wherein the compound of the materials used has different chemical, physical, and mechanical properties
The phase contained in the ADC 12 matrix material is composed of α-Al which is the main phase in the alloy, grey acicular eutectic, Al2Cu phase, and β phase (Al5FeSi) in the form of needle like
In addition of 0.15 wt% titanium boron (TiB) and 0.03 wt% Sr on the composite ADC 12/silicon carbide (SiC) affects the decreases of secondary dendrite arm spacing (SDAS), with an addition of the wt% TiB will bw decrease grain size significantly on the A356/SiC [12]
Summary
The composites are different from the metal alloys, wherein the compound of the materials used has different chemical, physical, and mechanical properties. The main components of the composite are the matrix and reinforce [1]. ADC 12 is used as a composite matrix which is an aluminum alloy with a composition of Silicon < 12 %, ADC 12 have a relatively lightweight, corrosion resistance, high thermal conductivity, and ductile [2] This research is conducted obtain homogeneous particle distribution, and the escalation of various mechanical properties, so that it exceeds the aluminium ADC 12 tensile strength, 98.36 MPa and hardness value 35.03 HRB [3]
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