| Performance comparison of AlTiC and AlTiB master alloys in grain refinement of commercial and high purity aluminum |
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| 作者姓名： | 李建国 黄敏 马蓦 叶炜 刘东雨 宋东明 白秉哲 方鸿生 |
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| 作者单位： | Laboratory of Advanced Materials Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China，Laboratory of Advanced Materials，Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China，Laboratory of Advanced Materials，Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China，Laboratory of Advanced Materials，Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China，Laboratory of Advanced Materials，Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China，Kunming Metallurgy Research Institute Kunming 650031，China，Laboratory of Advanced Materials，Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China，Laboratory of Advanced Materials，Department of Materials Science and Engineering，Tsinghua University Beijing 100084 China |
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| 摘 要： | 1 Introduction Since AlTiC master alloys were improved greatly as a new type of master alloy used in grain refinement of aluminum and aluminum alloys in the middle of 1980s1, 2], there were many important progresses in the preparation techniques and the …
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| 关 键 词： | AlTiC AlTiB 铝合金 性能比较 晶粒长大 |
| 收稿时间： | 2004-12-29 |
| 修稿时间： | 2005-11-21 |
Performance comparison of AlTiC and AlTiB master alloys in grain refinement of commercial and high purity aluminum |
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| LI Jian-guo,HUANG Min,MA Mo,YE Wei,LIU Dong-yu,SONG Dong-ming,BAI Bing-zhe,FANG Hong-sheng.Performance comparison of AlTiC and AlTiB master alloys in grain refinement of commercial and high purity aluminum[J].Transactions of Nonferrous Metals Society of China,2006,16(2):242-253. |
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| Authors: | LI Jian-guo HUANG Min MA Mo YE Wei LIU Dong-yu SONG Dong-ming BAI Bing-zhe FANG Hong-sheng |
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| Affiliation: | 1. State Key Laboratory of Metal Matrix Composites, School of Materials Science & Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;2. School of Materials Science & Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;3. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;4. School of Materials Science & Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China |
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| Abstract: | For further knowledge about the refining performance of AlTiC master alloys, Al5.5Ti0.25C and Al6.5Ti0.5C master alloys containing high Ti and C content were prepared and used in grain refining experiments of 99.8% commercial pure aluminum(CPAl). Their performance was compared with two types of Al5Ti1B refiners whose performance was nowadays considered to be the best. These two types of master alloys show similar refining efficiency at the addition level of 0.2%. However, at the addition level of 0.5%, there still exists great performance difference between AlTiC and Al5TiB alloys in grain refinement of 99.98% and 99.995% high purity aluminum(HPAl). The growth of columnar grains is fully suppressed due to the refinement of AlTiC at the addition level of 0.5%. Also, at the same addition level, the grain refining experiments of Al3Ti0.15C and Al5Ti0.2C master alloys which have found initial commercial applications are conducted in the above-mentioned three types of pure aluminum. According to the experimental results, these two refiners of different compositions are both nonideal. The second phase particles extracted from each refiner were observed through TEM, while the nuclei of grains after grain refinement were observed through SEM. The results were analyzed through computation and comparison of the constitutional-supercooling parameter and the growth-restriction parameter whose values were determined by solute element in aluminum melt with different purity. Apparently, AlTiC master alloys with high content of Ti and C element have great refining potential. |
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| Keywords: | AlTiC AlTiB commercial pure aluminum high purity aluminum heterogeneous nucleation grain refinement |
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