Effect of scandium on structure and hardening of Al–Ca eutectic alloys
作者： N.A. Belov , E.A. Naumova , A.N. Alabin , I.A. Matveeva
DOI: 10.1016/J.JALLCOM.2015.05.155
关键词:
摘要: Abstract The phase composition, structure and hardening of alloys in the aluminium corner Al–Ca–Sc system were studied range up to 10% Ca 1% S≿. experimental study (optical, scanning transmission electron microscopy with electron-microprobe analysis, differential thermal analysis hardness measurements) was combined Thermo-Calc software simulation for optimization alloy composition. It shown that only phases binary systems (Al 4 и Al 3 Sc) might be equilibrium solid solution. (Al) + Al eutectic had a much finer as compared Al–Si eutectic, which suggests possibility reaching higher mechanical properties commercial A356 type. influence annealing temperature within 600 °С on studied. determined maximum corresponded at 300 °С, due precipitation Sc nanoparticles their further coarsening. With an example Al-7.6% Ca-0.3% model alloy, principal manufacturing casting based demonstrated. Unlike type, does not require quenching, particles are formed course casting.
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