SOLIDIFICATION PHASE SELECTION IN DIRECTION-ALLY SOLIDIFIED Ti–(44%—54%)Al ALLOYS

Acta Metall Sin

2009, Vol. 45

Issue (12): 1479-1486 DOI:

论文

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SOLIDIFICATION PHASE SELECTION IN DIRECTION-ALLY SOLIDIFIED Ti–(44%—54%)Al ALLOYS

LI Xinzhong ¹; SUN Tao ²; YU Caixia ¹; SU Yanqing ²; CAO Yongzhi ²; GUO Jingjie ¹; FU Hengzhi ¹

1. School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001
2. School of Mechatronics Engineering; Harbin Institute of Technology; Harbin 150001

Cite this article:

LI Xinzhong SUN Tao YU Caixia SU Yanqing CAO Yongzhi GUO Jingjie FU Hengzhi . SOLIDIFICATION PHASE SELECTION IN DIRECTION-ALLY SOLIDIFIED Ti–(44%—54%)Al ALLOYS. Acta Metall Sin, 2009, 45(12): 1479-1486.

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Abstract

Directional solidification experiments were conducted for Ti–(44%—54%)Al (atomic fraction) alloys in a wide range of ratios between temperature gradients and growth rates. Interfacial morphology evolution, microstructure formation and the final lamellar orientatios were investigated undedifferent solidification conditions. Nucleation and compositional undercooling citerion were used to clculate the phase selection map for Ti–Al alloys which gives phases and corresponding microstructures at different initial compositions and solidification parameters. The map is in good agreement with the experimental results and gives important criteria for determing phase compositions and solidification parameters in lamellar orientation control of Ti–Al alloys.

Key words: Ti–Al alloy directional solidification phase selection

Received: 09 June 2009

ZTFLH:

TG249.9

Fund:

Supported by National Natural Science Foundation of China (Nos.50771041 and 50801019), China Postdoctoral Science Foundation (No.20080430909), Financial Assistance Under Heilongjiang Postdoctorial Fund (No.LBH–Z08127) and Development Programme for Outstanding Young Teachers in Harbin Institute of Technology (No.HITQNJS.2008.018)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I12/1479

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