Sr含量对免热处理压铸铝合金组织与性能的影响

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中图分类号：TG146.2 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20240316

Effect of Sr Content on Microstructure and Properties of Heat-Free Treatment Die-Casting Aluminum Alloys

Wang Dengfeng'，Li Qinpeng'，Liang Jianzhong²，Liu Bing²，Chen Xuewen³ （1.GuangdongXiongjinPrecisionCastingTechnologyCo.Ltd.，Foshan;2.GuangdongYizhongPrecisionTechnologyCo， Ltd.，Zhaoqing ; 3.Guangdong Engineering Polytechnic，Guangzhou 510660）

Abstract：Theefectsof Srcontenton the microstructure，fluidityandmechanical propertiesof heat-free treatment die-casting aluminumallyarestudied by scanning electron microscopyand electronic tensile testing machine.The results show that with the increase of Sr content，the morphology of eutectic Si phase in die-casting aluminum alloyis refinedandmodified into fine particlesandshortbars，the length of theflowing samples of diecastingaluminumaloyliquidincreasesgraduallyandthe tensilemechanical propertiesareimprovedgradually.The optimum Srcontent is O.08% forrefiningand modification of die-casting aluminum aloy，the lengthofflowing sample is 879 mm，the tensile strength is 286.2MPa ，and the elongation is 7.9% ，the length of flowing sample，tensile strength and elongation of die-casting aluminum alloy are increased by 10.4% ， 7.8% and 16.2% ，respectively.

Keywords：Die-casting aluminumalloy，Heat-free treatment，Refiningand modification，Srcontent

1前言

压铸铝合金零部件的尺寸精度高、生产效率高，可成形各种形状复杂的零部件，因而广泛应用于汽车、家电、电子通信、机械设备等行业。（剩余3635字）