| 冷却速度对Al-7Si-0.3Mg-0.15Fe合金凝固参数和微观组织的影响(英文) | |
| 陈瑞 ; 石玉峰 ; 许庆彦 ; 柳百成 ; Rui CHEN ; Yu-feng SHI ; Qing-yan XU ; Bai-cheng LIU | |
| 2016-03-30 ; 2016-03-30 | |
| 关键词 | 铝合金 冷却速度 热分析 凝固参数 微观组织 aluminium alloys cooling rate thermal analysis solidification parameters microstructure TG146.21 |
| 其他题名 | Effect of cooling rate on solidification parameters and microstructure of A1-7Si-0.3Mg-0.15Fe alloy |
| 中文摘要 | 研究凝固过程中冷却速度对Al-7Si-0.3Mg-0.15Fe合金凝固参数和组织的影响。为了获得不同的冷却速度,设计了5个不同厚度阶梯的阶梯间。通过计算机辅助热分析法得到冷却速度和凝固参数。结果显示,冷却速度越高,初生α(Al)的形核温度、共晶反应温度以及固相线的温度都越低。当冷却速度由0.19℃/s增加到6.25℃/s时,二次枝晶臂间距(SDAS)从68μm下降到20μm,初生相的体积分数也下降5%。铁相的平均长度由28μm下降到18um,并且提高了铁相在基体中的分布均匀性。此外,冷却速度的提高,有利于促进共晶硅向纤维状分支结构的转变,减少了基体中的块状和板状共晶硅。; The effects of cooling rate on the solidification parameters and microstructure of Al-7Si-0.3Mg-0.15 Fe alloy during solidification process were studied.To obtain different cooling rates,the step casting with five different thicknesses was used and the cooling rates and solidification parameters were determined by computer-aided thermal analysis method.The results show that at higher cooling rates,the primary α(Al) dendrite nucleation temperature,eutectic reaction temperature and solidus temperature shift to lower temperatures.Besides,with increasing cooling rate from 0.19 ℃/s up to 6.25 ℃/s,the secondary dendritic arm spacing decreases from 68 μm to 20 μm,and the primary dendritic volume fraction declines by approximately 5%.In addition,it reduces the length of Fe-bearing phase from 28 μm to 18 μm with a better uniform distribution.It is also found that high cooling rates make for modifying eutectic silicon into fibrous branched morphology,and decreasing block or lamella shape eutectic silicon. |
| 语种 | 英语 ; 英语 |
| 内容类型 | 期刊论文 |
| 源URL | [http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/141699]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 陈瑞,石玉峰,许庆彦,等. 冷却速度对Al-7Si-0.3Mg-0.15Fe合金凝固参数和微观组织的影响(英文)[J],2016, 2016. |
| APA | 陈瑞.,石玉峰.,许庆彦.,柳百成.,Rui CHEN.,...&Bai-cheng LIU.(2016).冷却速度对Al-7Si-0.3Mg-0.15Fe合金凝固参数和微观组织的影响(英文).. |
| MLA | 陈瑞,et al."冷却速度对Al-7Si-0.3Mg-0.15Fe合金凝固参数和微观组织的影响(英文)".(2016). |
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