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The optical microscopy,scanning electron microscopy(SEM) and energy-dispersive spectrometry(EDS) were used to assess the influence of micro-addition of(La+Yb) on the microstructure and mechanical performance of the AlSi10Cu3 alloy in heat treatment conditions.It was shown that the appropriate(La+Yb) addition(0.3 wt.% or 0.6 wt.%) transformed the needle-like β-Al_5FeSi phase into Chinese script or spherical α-Al_8Fe_2Si phase.Eutectic silicon refined the long needle-like particles into granular or round particles at 0.6 wt.%(La+Yb) content.Moreover,the La_3Al_(11) and YbAl_3 phases acted as strengthening phases during the heat treatment processing in the alloy with the addition of(La+Yb).Consequently,the alloy with 0.6 wt.%(La+Yb) exhibited an enhanced mechanical properties response with ultimate tensile strength,elongation,and hardness at 69.35%,113.26% and 23.61% higher than those of the unmodified alloy,respectively.Further addition(0.9 wt.%) of(La+Yb) resulted in the increasing of the black acicular RE-rich intermetallics during heat treatment,which could aggravate the situation of stress concentration leading to deterioration of the mechanical properties of alloy.
The optical microscopy, scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS) were used to assess the influence of micro-addition of (La + Yb) on the microstructure and mechanical performance of the AlSi10Cu3 alloy in heat treatment conditions. It The needle-like β-Al_5FeSi phase into Chinese script or spherical α-Al_8Fe_2Si phase. Eutectic silicon refined the long needle-like particles (0.3 wt.% or 0.6 wt.%) into granular or round particles at 0.6 wt.% (La + Yb) content. Mangover, the La_3Al_ (11) and YbAl_3 phases acted as strengthening phases during the heat treatment processing in the alloy with the addition of (La + Yb) , the alloy with 0.6 wt.% (La + Yb) exhibited an enhanced mechanical properties response with ultimate tensile strength, elongation, and hardness at 69.35%, 113.26% and 23.61% higher than those of the unmodified alloy, respectively. 0.9 wt.%) Of (La + Yb) resulted in the increasing of the black acicular RE-rich intermetallics during heat treatment, which could aggravate the situation of stress concentration leading to deterioration of the mechanical properties of alloy.