Effect of Low-Intensity Pulsed Magnetic Field-Assisted Solid Solution Treatment on the Microstructure and Properties of ZL114 Aluminum Alloy Containing Rare Earth AITranslate

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Chinese Library Classification Number:TG166.3[金属学及工艺—热处理]

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The conventional T6 heat-treated ZL114A aluminum alloy struggles to meet the increasingly demanding performance requirements in the aerospace field.To address this,this study proposed a novel solid solution treatment process for ZL114 aluminum alloy containing rare earth elements in a low-intensity pulsed magnetic field.A comparative analysis was conducted on the microstructural characteristics of ascast ZL114 aluminum alloys with and without rare earth Ce addition.At the same time,the effects of different solid solution temperatures(530℃,540℃and 550℃)and magnetic induction intensities(35 mT,50 mT,65 mT and 80 mT)on alloy microstructure and Vickers hardness under a low-intensity pulsed magnetic field condition were explored.The results demonstrate that after adding rare earth Ce with a mass fraction of 0.3%,theα-Al grain size of as-cast ZL114A aluminum alloy is significantly refined,with the average grain size decreasing from 157.0μm(without Ce)to 125.7μm,achieving a grain refinement of 19.9%.In a low-intensity pulsed magnetic field with a magnetic induction intensity of 65 mT,for the ZL114A aluminum alloy containing 0.3%Ce subjected to a solid solution treatment at 550℃for 40 min,the average area,radius ratio and roundness of eutectic Si in the microstructure are 50.5μm²,6.7 and 2.6,respectively,representing reductions of 31.2%,50.4%and 57.4%compared to conventional solid solution treatment at 530℃for 600 min.Additionally,the Vickers hardness increases by 20.5%,and the solid solution treatment time is reduced by 93%.