| 化学细化半固态Al-Si合金表观黏度及组织分析 |
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| 引用本文： | 罗伟,严密.化学细化半固态Al-Si合金表观黏度及组织分析[J].材料科学与工艺,2005,13(4):423-426. |
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| 作者姓名： | 罗伟 严密 |
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| 作者单位： | 浙江大学,硅材料国家重点实验室,浙江,杭州,310027 |
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| 基金项目： | 高等学校博士学科点专项科研项目
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航天支撑技术基金 |
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| 摘 要： | 为研究化学晶粒细化法对半固态Al-Si合金流变行为的影响,分别添加了Al-5Ti-B、K2TiF6、K2TiF6 石墨以及K2TiF6 Ti细化剂,在合金固化过程中利用Couette同轴圆筒式黏度计测量其表观黏度的变化,并观测不同固相分数试样微观组织.研究表明,化学晶粒细化法大大减小了半固态Al-Si合金的表观黏度,Al-5Ti-B细化效果好于K2TiF6,石墨或Ti和K2TiF6的组合较单一的K2TiF6效果显著.
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| 关 键 词： | 晶粒细化 Al-Si合金 表观黏度 凝固组织 半固态合金 化学细化 半固态 合金 表观黏度 组织分析 refining chemical alloy microstructure apparent viscosity 细化效果 组合 微观组织 试样 固相分数 观测 变化 测量 黏度计 筒式 |
| 文章编号： | 1005-0299(2005)04-0423-04 |
| 收稿时间： | 2003-09-08 |
| 修稿时间： | 2003年9月8日 |
Study on the apparent viscosity and microstructure of semi-solid Al-Si alloy prepared by chemical refining |
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| LUO Wei,YAN Mi.Study on the apparent viscosity and microstructure of semi-solid Al-Si alloy prepared by chemical refining[J].Materials Science and Technology,2005,13(4):423-426. |
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| Authors: | LUO Wei YAN Mi |
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| Abstract: | The paper experimentally investigated the effects of grain refining on the rheological response of semi-solid Al - Si alloys through chemical refining. Selected refiners included Al - 5Ti - B, KETiF6, K2TiF6 plus graphite and K2TiF6 plus Ti. The apparent viscosity of semi-solid Al - Si alloys was measured using Couette viscometer during solidification. Samples at different solid fractions were quenched to observe the microstructure. It was found that grain refining drastically lowered the apparent viscosity of Al - Si alloys. The effect of Al -5Ti - B was better than that of KETiF6. The effect of KETiF6plus graphite or Ti was better than that of KETiF6. |
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| Keywords: | grain refining Al - Si alloys apparent viscosity solidification microstructure semi-solid alloys |
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