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Influence of Growth Rate on Microstructural Length Scales in Directionally Solidified NiAl-Mo Hypo-Eutectic Alloy

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Abstract

In this article, the Ni-46.1Al-7.8Mo (at.%) alloy was directionally solidified at different growth rates ranging from 15 μm/s to 1000 μm/s under a constant temperature gradient (334 K/cm). The dependence of microstructural length scales on the growth rate was investigated. The results show that, with the growth rate increasing, the primary dendritic arm spacings (PDAS) and secondary dendritic arm spacings (SDAS) decreased. There exists a large distribution range in PDAS under directional solidification conditions at a constant temperature gradient. The average PDAS and SDAS as a function of growth rate can be given as λ1 = 848.8967 V−0.4509 and λ2 = 64.2196 V−0.4140, respectively. In addition, a comparison of our results with the current theoretical models and previous experimental results has also been made.

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Acknowledgements

The authors acknowledge the National Natural Science Foundation of China (No. 51564041), the Natural Science Foundation of Inner Mongolia of China (No. 2014MS0518), the Inner Mongolia University of Science and Technology Industry-Study-Research Found (No. PY201509), and the Inner Mongolia University of Science and Technology Innovation Fund (No. 2012NCL004) for financial support.

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Authors and Affiliations

  1. College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Bao’tou, 014010, People’s Republic of China

    Jianfei Zhang, Xuewei Ma, Huiping Ren, Lin Chen, Zili Jin & Zhenliang Li

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Jun Shen

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  1. Jianfei Zhang
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  2. Xuewei Ma
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Correspondence to Jianfei Zhang.

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Zhang, J., Ma, X., Ren, H. et al. Influence of Growth Rate on Microstructural Length Scales in Directionally Solidified NiAl-Mo Hypo-Eutectic Alloy. JOM 68, 178–184 (2016). https://doi.org/10.1007/s11837-015-1671-6

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