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In-situ observation of solid-liquid interface transition during directional solidification of Al-Zn alloy via X-ray imaging

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Journal of Materials Science & Technology 2020年第4期39卷 113-123页

作者： Yuanhao Dong Sansan Shuai Tianxiang Zheng Jiawei Cao Chaoyue Chen Jiang Wang Zhongming Ren State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The morphological instability of solid/liquid(S/L)interface during solidification will result in different patterns of microstructure.In this study,two dimension(2 D)and three dimension(3 D)in-situ observation of solid/liquid interfacial morphology transition in Al-Zn alloy during directional solidification were performed via X-ray imaging.Under a condition of increasing temperature gradient(G),the interface transition from dendritic pattern to cellular pattern,and then to planar growth with perturbation was captured.The effect of solidification parameter(the ratio of temperature gradient and growth velocity(v),G/v)on morphological instabilities was investigated and the experimental results were compared to classical"constitutional supercooling"theory.The results indicate that 2 D and 3 D evolution process of S/L interface morphology under the same thermal condition are different.It seems that the S/L interface in 2 D observation is easier to achieve planar growth than that in 3 D,implying higher S/L interface stability in 2 D thin plate samples.This can be explained as the restricted liquid flow under 2 D solidification which is beneficial to S/L interface stability.The in-situ observation in present study can provide coherent dataset for microstructural formation investigation and related model validation during solidification.

关键词： Al-Zn alloy Directional solidification solid/liquid interface instability In-situ observation X-ray imaging

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Microstructure and solid/liquid Interface Evolutions of Directionally solidified Fe-Al-Ta Eutectic Alloy

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Journal of Wuhan University of Technology(Materials Science) 2019年第3期34卷 656-661页

作者：崔春娟 WANG Songyuan YANG Meng SU Haijun WEN Yagang WANG Pei REN Chiqiang School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an710055China Shaanxi Engineering Technology Research Center for Wear-resisting Materials Xi'an710055China

A modified Bridgman directional solidification technique was used to prepare Fe-Al-Ta eutectic in situ composites at different growth rates ranging from 6 to 80 gm/s. The directionally solidified Fe- Al-Ta eutectic composites are composed of two phases: Fe(Al,Ta) matrix phase, and Fe2Ta(Al) Laves phase. solidification microstructure is affected by solidification rate. Microstructure of the Fe-Al-Ta eutectic alloy grown at 6.0 pm/s is broken-lamellar eutectic. Eutectic colonies are formed with the increase of the solidification rate. Microstructures are mainly composed of the lamellar or fibrous eutectic at the center of the colony and coarse lamellar eutectic zone at the boundary. Meanwhile, the inter-lamellar spacing (or the inter-rod spacing) is decreased. The spacing adjustments are also observed in Fe-Al-Ta eutectic alloy. The solid/liquid interface evolves from planar interface to shallow cellular interface, then to deep cellular, and finally to shallow cellular planar with the increase of the solidification rate.

关键词： directional solidification solidification rate eutectic alloy solid/liquid interface

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