Effects of In-situ TiB2 Particles on Microstructure and Mechanical Properties of AlSi10Mg Alloy
Al-Si alloys have been widely used in fields such as aerospace and transportation due to the excellent cast-ability,corrosion resistance,and desirable mechanical properties.In recent years,with the continuous development of technology,higher requirements have been put forward for the heat resistance performance of Al-Si alloys.Effects of in-situ TiB2 particles on microstructure and properties of AlSi10Mg alloy at room temperature and high temperature were investigated.The results indicate that the introduction of in-situ TiB2 particles can not only act as the heteroge-neous nucleation of α-Al to refine the matrix grains,but also inhibit the growth of eutectic Si,modifying eutectic Si.Furthermore,the tensile strength,yield strength,and elastic modulus of the alloy are increased with the increase of TiB2 particle content.After adding 10%TiB2 particles,the tensile strength,yield strength,and elastic modulus of the alloy at room temperature(24℃)are increased from 155 MPa,103 MPa,and 75.2 GPa to 206 MPa,133 MPa,and 89.3 GPa,respectively.The tensile strength,yield strength,and elastic modulus of the alloy are increased from 112 MPa,70 MPa,and 68.5 GPa to 137 MPa,89 MPa,and 81.2 GPa at 200℃,respectively.
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