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Influences of Fe and B on the Columnar Structure of Ti-46Al Alloys
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Influences of Fe and B on the Columnar Structure of Ti-46Al Alloys
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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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    摘要:

    對(duì)利用非自耗電弧熔煉設(shè)備得到的Ti-46Al, Ti-46Al-0.3B, Ti-46Al-0.5B, Ti-46Al-2Fe, Ti-46Al-2Fe-0.3B和Ti-46Al-2Fe-0.5B合金的凝固組織進(jìn)行了研究。結(jié)果表明，鑄態(tài)TiAl基合金的宏觀組織為典型的柱狀晶組織，而且平均柱狀晶直徑隨著Fe和B元素的加入顯著減小。其中，Ti-46Al-2Fe-0.5B合金的柱狀晶直徑最小。B元素可以顯著地細(xì)化TiAl基合金的柱狀晶組織和枝晶組織，這主要是由于B元素的添加可以顯著增加固液界面前沿的成分過冷度從而細(xì)化TiAl基合金的凝固組織。而且，F(xiàn)e元素的添加還可以顯著地提高B元素對(duì)TiAl基合金的柱狀晶組織的細(xì)化效果

    Abstract:

    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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楊慧敏,蘇彥慶,駱良順,陳 輝,郭景杰,傅恒志. Influences of Fe and B on the Columnar Structure of Ti-46Al Alloys[J].稀有金屬材料與工程,2012,41(4):570~574.[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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  • 收稿日期:2011-04-08
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