Open AccessThe Effect of Al2O3 Nano Particles on Characteristics of Mg-Al-5TiB Grain Refiner Composites Produced by Stir Casting Method
Author(s) -
Alintiya Zhafara,
S. Anne Zulfia
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/924/1/012021
Subject(s) - materials science , microstructure , ultimate tensile strength , composite material , scanning electron microscope , porosity , ductility (earth science) , composite number , casting , volume fraction , grain size , compressive strength , particle size , optical microscope , creep , chemical engineering , engineering
High needs for light material with good mechanical characteristics made magnesium and its alloys as an alternative choice because of magnesium’s low density, 1.74 gr/cm 3 . However, its use is limited by its low strength and ductility. In this experiment, a fabrication process of the composite which is Mg-Al-5TiB as Matrix with the addition of Nano Al 2 O 3 as a reinforced with volume fraction varied from 0.10 Vf-% to 0.25 Vf-% by stir casting method. The composites then were characterized by both microstructure and mechanical properties. The microstructure was analyzed by an optical microscope and scanning electron microscope link to energy-dispersive spectra to analyze the phases present in composites and confirmed by X-Ray Diffraction. The XRD shows some phases such as Mg, MgO, MgAl 2 O 4 , and B 2 O 3. The optimum mechanical properties of composites were obtained at the addition of 0.2 Vf-% Al 2 O 3 , where the tensile strength, elongation, wear rate and impact strength were 46.1 MPa, 14%, 0.3x10- 5 mm 3 /s, and 0.06 J/mm 2 . The hardness of composites was value, 40.1 HRH. The porosity maximum was found at the addition of 0.25 Vf-% with the value of 9.37% caused by nano Al 2 O 3 particle forming clustering (porosity is related to clustered particles) and inhibiting liquid metal moving rate. The addition of grain refiner makes solidification went faster and refined the grains.