超声对纳米SiC_p增强A356铝基复合材料微观组织的影响
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摘要
采用固液混合铸造工艺制备了纳米SiC_p含量为2%的增强A356复合材料,研究了超声处理对复合材料中α-Al相和共晶Si的细化效果,以及纳米颗粒在此过程中的作用。结果表明,随着超声时间延长,α-Al相的二次枝晶间距和共晶Si的尺寸明显减小。当超声时间为3min时,α-Al的二次枝晶间距为8.1μm,较未进行超声处理的复合材料下降了49%;共晶Si的当量直径和长宽比分别是0.92μm和2.33,较未进行超声处理的复合材料分别下降了42%和32%。超声处理可以通过调控纳米SiC_p的分布来影响纳米SiC_p对α-Al与共晶Si相的细化效果。
The nano-SiC_p/A356 Al-matrix composites containing 2% nano-SiC_pwere synthesized with solid-liquid mixed casting method.The effects of ultrasonic vibration(UV)treatment on refinement of primary Al phase and eutectic Si phase in the composites prepared were analyzed,and the role of nano-SiC_pdistribution was described.The results show that both of the secondary dendritic arm spacing(SDAS)ofα-Al grains and the size of eutectic Si phase are decreased with the increase of the UV time.With UV time of 3 min,SDAS ofα-Al in the composites is 8.1μm,which is reduced by 49%than that of A356 matrix alloy.The mean diameter and aspect ratio of eutectic Si phase in the composites are 0.92μm and 2.33,which are reduced by 42%and 32%,respectively,than those of A356 matrix alloy without ultrasonic vibration treatment.The UV treatment can affect the refining effects by regulating the distribution of nano-SiC_p.
The nano-SiC_p/A356 Al-matrix composites containing 2% nano-SiC_pwere synthesized with solid-liquid mixed casting method.The effects of ultrasonic vibration(UV)treatment on refinement of primary Al phase and eutectic Si phase in the composites prepared were analyzed,and the role of nano-SiC_pdistribution was described.The results show that both of the secondary dendritic arm spacing(SDAS)ofα-Al grains and the size of eutectic Si phase are decreased with the increase of the UV time.With UV time of 3 min,SDAS ofα-Al in the composites is 8.1μm,which is reduced by 49%than that of A356 matrix alloy.The mean diameter and aspect ratio of eutectic Si phase in the composites are 0.92μm and 2.33,which are reduced by 42%and 32%,respectively,than those of A356 matrix alloy without ultrasonic vibration treatment.The UV treatment can affect the refining effects by regulating the distribution of nano-SiC_p.
引文
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[5]CHOI H,KONISHI H,LI X.Al2O3nanoparticles induced simultaneous refinement and modification of primary and eutectic Si particles in hypereutectic Al-20Si alloy[J].Mater.Sci.Eng.,2012,A541:159-165.
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[7]WU S S,YUAN D,LU S L,et al.Dispersion of nano-SiCPparticles in Al-matrix composites and mechanical properties prepared by complex processes[J].China Foundry,2018,15(3):97-103.
[8]JIA S,ZHANG D,XUAN Y,et al.An experimental and modeling investigation of aluminum-based alloys and nanocomposites processed by ultrasonic cavitation processing[J].Appl.Acoust.,2016,103:226-231.
[9]YANG Y,LAN J,LI X.Study on bulk aluminum matrix nanocomposite fabricated by ultrasonic dispersion of nano-sized SiC particles in molten aluminum alloy[J].Mater.Sci.Eng.,2004,A380:378-383.
[10]NIE K B,WANG X J,WU K,et al.Development of SiCp/AZ91magnesium matrix nanocomposites using ultrasonic vibration[J].Mater.Sci.Eng.,2012,A540:123-129.
[11]LAN J,YANG Y,LI X.Microstructure and microhardness of SiC nanoparticles reinforced magnesium composites fabricated by ultrasonic method[J].Mater.Sci.Eng.,2004,A386:284-290.
[12]SU H,GAO W L,ZHANG H,et al.Study on preparation of large sized nanoparticle reinforced aluminium matrix composite by solid-liquid mixed casting process[J].Mater.Sci.Tech-Lond.,2012,28:178-183.
[13]SHA M,WU S S,WAN L.Combined effects of cobalt addition and ultrasonic vibration on microstructure and mechanical properties of hypereutectic Al-Si alloys with 0.7%Fe[J].Mater.Sci.Eng.,2012,A554:142-148.
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[15]FERRY M,HAMILTON N E,HUMPHREYS F J.Continuous and discontinuous grain coarsening in a fine-grained particle-containing Al-Sc alloy[J].Acta Mater.,2005,53:1 097-1 109.