- Yang Huimin
Yang Huimin
National Key Laboratory for Hot Precision Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
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- Luo Liangshun
- Chen Hui
- Guo Jingjie
- Fu Hengzhi
National Science Foundation of China (50901025, 50771041, 50975060); State Key Laboratory of Advanced Metals Materials (2009ZD-06); Program of Excellent Team in Harbin Institute of Technology
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The microstructures of Ti-46Al, Ti-46Al-0.3B, Ti-46Al-0.5B, Ti-46Al-2Fe, Ti-46Al-2Fe-0.3B, and Ti-46Al-2Fe-0.5B alloys solidified on water-cooled copper crucible were investigated. It is found that the as-cast alloys possess a typical columnar structure, and the mean diameters of the columnar grains decrease significantly as the addition of Fe or B. The mean columnar diameter in Ti-46Al-2Fe-0.5B is found to be the smallest among these alloys. B addition can increase the constitutional supercooling in front of the solid-liquid interface, which refines the columnar structure and the dendritic structure. Moreover, Fe addition can enhance the refining effect of boron on the columnar structure of TiAl-based alloys
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[Yang Huimin, Su Yanqing, Luo Liangshun, Chen Hui, Guo Jingjie, Fu Hengzhi. Influences of Fe and B on the Columnar Structure of Ti-46Al Alloys[J]. Rare Metal Materials and Engineering,2012,41(4):570~574.]
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- Received:April 08,2011