首页|Dual-modification effect of Ca element on the hypereutectic Al-40wt% Cu alloy
Dual-modification effect of Ca element on the hypereutectic Al-40wt% Cu alloy
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NSTL
Elsevier
? 2022 Elsevier B.V.The influence of Ca element on the primary θ-Al2Cu and eutectic (θ-Al2Cu+α-Al) microstructure in Al-40wt% Cu hypereutectic alloy was investigated. The results showed that the Ca can significantly improve the size and morphology of primary θ-Al2Cu, which was mainly attributed to the enrichment of Ca atoms in the front of solid-liquid interface during solidification. The enrichment of Ca can hinder the stacking of solute atoms, which impeded the radial growth, so as to make the θ-Al2Cu transform from angular planar grains into equiaxed grains with fine size. In addition, the enrichment of Ca also prevented the stacking of solute atoms at spiral dislocation steps during the axial growth. The decrease of eutectic spacing was mainly attributed to the increase in undercooling. Compared with the tensile strength of unmodified Al-40Cu alloy, the tensile strength of Al-40Cu alloy was enhanced by adding 0.6 wt% Ca which increased from 81.21 MPa to 144.80 MPa. In addition, the fracture elongation increased from 2.3% to 4.48%. The improvement of morphology of primary θ-Al2Cu phase was the basic reason for the enhancement of mechanical properties of Al-40Cu alloy.
NSTL
Elsevier
