| Phase and its morphologies of Ti-45 % Al alloy directionally solidified at different growth rates |
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| 作者姓名： | 刘畅 苏彦庆 毕维生 郭景杰 贾均 傅恒志 |
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| 作者单位： | School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China |
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| 摘 要： | The microstructures of Ti-45%Al(molar fraction) alloy directionally solidified at different growth rates in alumina tube by electromagnetic heating zone melting were studied. The measured temperature gradient of the system is about 104K/m. The microstructures show that the primary solidified phase is β phase at different growth rates. The growth at low rates from 1.94 × 10-6 m/s to 4. 16 × 10-6 m/s results in a transient solid/liquid interface structure from planar to shallow cellular. This transient rate is larger than the theoretical value of vc = 6.94 × 10-7 m/s.Compared with vt = vc/k = 1.01 × 10-6 m/s, the cellular-dendritic transient rate of experiment is observed in the range of 1.67 × 10-5- 2.50 × 10-5 m/s. The primary arm spacing decreases with increasing growth rate.
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| 关 键 词： | 钛-45%铝合金 直接固化 生长率 表面结构 电磁加热 |
Phase and its morphologies of Ti-45 %Al alloy directionally solidified at different growth rates |
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| LIU Chang,SU Yan-qing,BI Wei-sheng,GUO Jing-jie,JIA Jun,FU Heng-zhi.Phase and its morphologies of Ti-45 % Al alloy directionally solidified at different growth rates[J].Transactions of Nonferrous Metals Society of China,2005,15(2):286-290. |
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| Authors: | LIU Chang SU Yan-qing BI Wei-sheng GUO Jing-jie JIA Jun FU Heng-zhi |
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| Abstract: | |
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| Keywords: | Ti-45Al alloy directional solidification growth rate interface structure |
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