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采用熔盐电解法制备Al-Si-(Sc, Ce)合金，研究Ce对该合金组织及力学性能的影响。发现Ce具有显著改性细化作用，使树枝状初生α-Al成为圆形或椭圆形，共晶AlSi_2Sc2相由长形层片状变为网状(长度由1 000μm减至200～500μm)。共晶Si相形貌由针片状转变为纤维状，降低了颗粒平均面积、圆度比和平均长度，并经共晶反应生成三元CeAl_2Si2相。Al-7Si-0.79Sc-0.62Ce合金显微硬度比Al-7Si-0.82Sc增大，共晶Si、含Sc和含Ce区域硬度值分别提升8.5%、49.7%和99%,其强化机制与Ce细化作用有关。
Abstract：Al-Si-Sc-Ce alloys with various Ce contents were prepared by molten salt electrolysis for studying their microstructure and mechanical properties.It is found that Ce refines the alloys with turning the primary α-Al from dendrite into round structure, and AlSi_2Sc2 phase from long flake-like into network-like(their length from 1 000 μm down to 200-500 μm).The morphology of eutectic Si changes from plate-like into fiber-like, with drops in average area, roundness and average length of Si particles.A ternary CeAl_2Si2 phase is also formed via eutectic reaction in alloys.The microhardness of Al-7Si-0.79Sc-0.62Ce alloys is higher than that of Al-7Si-0.82Sc alloys, where the hardness values of the eutectic Si, Sc-containing and Ce-containing phases rise by 8.5%,49.7% and 99.3 %,respectively.The mechanism for such improvement is related to Ce induced refinement.
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基本信息:
中图分类号:TG146.21
引用信息:
[1]郭浩,刘轩,王曾洁,等.Ce对熔盐电解制备Al-Si-Sc-Ce合金组织及力学性能的影响[J].有色金属(冶炼部分),2023(02):86-93.
基金信息:
国家自然科学基金资助项目(51874035)
2023-01-30
2023-01-30