首页|Effects of a novel refiner Al-3Ti-4.35La combined with Sr on microstructure and mechanical properties of as-cast A356 alloy
Effects of a novel refiner Al-3Ti-4.35La combined with Sr on microstructure and mechanical properties of as-cast A356 alloy
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Effects of a novel refiner Al-3Ti-4.35La combined with Sr on microstructure and mechanical properties of as-cast A356 alloy
It is a practically significant issue to refine and modify industrial Al-Si casting alloy to improve its properties.In the present study,a novel refiner Al-3Ti-4.35La alloy,prepared by a melt-reaction method,was used,combined with Sr to refine the as-cast A356 alloy.Their effects on the as-cast microstructures and mechanical properties of A356 alloy were investigated.The results indicate that the combined addition of Al-3Ti-4.35La intermediate alloy and Sr can improve the microstructure and enhance the mechanical properties of A356 alloy.After adding 0.3wt.％Al-3Ti-4.35La and 0.03wt.％Sr to the as-cast A356 alloy,the average grain size of α-Al decreases from 693.47 μm to 264.13 μm(a decrease of 61.91％),the secondary dendrite arm spacing(SDAS)is decreased by 47.8％from 32.09 μm to 16.75 μm,and the eutectic Si is transformed from an acicular structure to short rods and a granular structure.The ultimate tensile strength(UTS)and elongation(EL)of the as-cast A356 alloy modified by Al-3Ti-4.35La and Sr reach 216.3 MPa and 10.6％,which are enhanced by 29.54％and 134.66％compared with the unmodified alloy,respectively.The fracture mode is transformed from transgranular fracture to intergranular fracture,and the ductile toughness of the alloy is improved.After adding the Al-3Ti-4.35La and Sr,the undercooling for the nucleation of α-Al and eutectic Si increases,leading to an accelerated nucleation rate and an increased number of nuclei,which shortens the duration of the eutectic reaction and consequently inhibits grain growth.
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