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Phase selection and microstructure evolution within eutectic Ti-Si alloy solidified at containerless state

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Abstract

Phase selection and microstructure evolution of the undercooled eutectic Ti-Si alloy were systematically investigated by the electromagnetic levitation method, and the maximum undercooling achieved was 318 K (0.2TE). The migration of the liquid-solid interface was in-situ detected by a high-speed camera system. When the undercooling is smaller than 140 K, the liquid-solid interface is smooth. Once the undercooling arrives at 230 K, the liquid-solid interface is irregular, which reflects the growth transition from the solute control to the combined controls of solute and thermal. The eutectic growth velocity increases as an exponential function of undercooling. The electromagnetic stirring effect makes it difficult to increase undercooling, but plays an important role in accelerating the eutectic reaction velocity at low and moderate undercoolings. Primary dendritic β-Ti phase appears in the solidified alloy from 63 to 176 K undercoolings, and the microstructure is completely composed of eutectic once the undercoolings increase up to 230 K. When the undercoolings exceed 273 K, the microstructure consists of uniformly distributed irregular eutectic. For the drop tube experiments, the microstructures composed of a large amount of dendritic α-Ti phase and eutectic phase are found in a wide range of diameters from 69 to 725 µm. As the decrease of diameter, the solubility of Si in the dendritic α-Ti phase dramatically increases from 6.80% to 10.73%, and the ratio of the area occupied by the dendritic α-Ti on a cross-section of solidified alloy obviously increases from 23.52% to 41.02%, which result from the combined effects of high undercooling and large cooling rate.

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Authors and Affiliations

  1. School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an, 710072, China

    ZhiCong Luo, Jian Chang & HaiPeng Wang

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  1. ZhiCong Luo
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  2. Jian Chang
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  3. HaiPeng Wang
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Correspondence to HaiPeng Wang.

Additional information

This work was supported by the National Key R&D Program of China (Grant No. 2018YFB2001800), and the National Natural Science Foundation of China (Grant Nos. 51734008, 51771154, and 52088101). We are grateful to Miss. Wang Xiaojuan, Mr. Zuo Dongdong and Dr. Cai Xiao for their help of experiment. We are especially grateful to Prof. Wei Bingbo for the experimental support.

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Luo, Z., Chang, J. & Wang, H. Phase selection and microstructure evolution within eutectic Ti-Si alloy solidified at containerless state. Sci. China Technol. Sci. 65, 1587–1598 (2022). https://doi.org/10.1007/s11431-021-1992-1

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  • DOI: https://doi.org/10.1007/s11431-021-1992-1

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