| Sb变质后Al-Si合金共晶组织的不均匀性 |
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| 引用本文： | 董光明,廖恒成,孙国雄,韩正铜.Sb变质后Al-Si合金共晶组织的不均匀性[J].特种铸造及有色合金,2011,31(5):418-420,387. |
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| 作者姓名： | 董光明 廖恒成 孙国雄 韩正铜 |
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| 作者单位： | 1. 中国矿业大学机电工程学院
2. 东南大学材料科学与工程学院 |
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| 基金项目： | 江苏省自然科学基金资助项目 |
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| 摘 要： | 为了研究Sb变质的Al-13Si-0.4Mg合金中共晶组织的不均匀性,采用液淬技术及光学显微镜考察Sb变质的Al-13Si-0.4Mg合金凝固过程中的组织形成过程。结果发现,在共晶反应初期,先期形成的共晶团的分枝很少,此时形成的共晶组织往往较粗大,表现为共晶Si片较厚、片间距大、分枝少;而此后的共晶反应过程中,共晶团的分枝增加,形成的共晶组织较细小,表现为共晶Si片较薄、片间距小、分枝密集。组织不均匀性的主要原因是Sb在共晶固/液界面前沿的富集程度不同,导致了Sb在共晶Si表面的吸附数量不同,从而影响了共晶Si的生长速度。
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| 关 键 词： | Al-Si合金 组织的不均匀性 锑 变质 |
Un-Uniformity of Eutectic Structure in Al-Si Alloy Modified with Antimony |
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| Dong Guangming,Liao Hengcheng,Sun Guoxiong,Han Zhengtong.Un-Uniformity of Eutectic Structure in Al-Si Alloy Modified with Antimony[J].Special Casting & Nonferrous Alloys,2011,31(5):418-420,387. |
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| Authors: | Dong Guangming Liao Hengcheng Sun Guoxiong Han Zhengtong |
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| Affiliation: | Dong Guangming1,Liao Hengcheng2,Sun Guoxiong2,Han Zhengtong1(1.School of Mechanical and Electrical Engineering,China University of Mining and Technology,Xuzhou,China,2.School of Material Science and Engineering,Southeast University,Nanjing,China) |
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| Abstract: | Microstructure evolution of Sr modified Al-13Si-0.4Mg alloy during solidification process was observed by quenching and OM(optical microscope) to understand the un-uniformity of eutectic structure in the alloy.The results show that,during the initial stage of eutectic reaction,coarse eutectic structure is created in the alloy as a result of low branches in formed eutectic colony,characterized by thick eutectic Si flakes with wide lamellar spacing and a few branches.With advancing in reaction,eutectic grain ... |
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| Keywords: | Al-Si Alloy Microstructure Un-uniformity Sb Modification |
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