Microstructure Evolution of Ti-47Al-2Cr-2Nb Alloy in the Liquid-Metal-Cooling (LMC) Directional-Solidification Process

被引：0

作者：

肖志霞 ^{[1
]}

张虎 ^{[1
]}

机构：

[1] School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics(BUAA)

来源：

Journal of Wuhan University of Technology(Materials Science) | 2011年 / 02期

关键词：

TiAl-based alloy; directional solidification; lamellar orientation; peritectic reaction;

D O I：

暂无

中图分类号：

TG111.4 [金属的液体结构和凝固理论];

学科分类号：

0702 ; 070205 ;

摘要：

The microstructure evolution of Ti-47Al-2Cr-2Nb alloy was investigated on liquid metal cooling type directional solidified apparatus at high temperature gradient.The analysis shows that it is solidified with primary β cells/dendrites,and then α phase is formed through peritectic reaction.Once the columnar grains grow into the steady state,the lamellar orientation inclined with the angle of 45° to the withdrawal direction is more favored than that with parallel to the withdrawal direction.In addition,α phase grain nucleates from β-interdendrite regions,and grows up to the dendritic trunk.If no other α grain hinders its growth,it would occupy the whole dendrite,or it would stop at the dendritic trunk for the weakened motivating drive in the β dendritic core.

引用

页码：198 / 202

页数：5

共 14 条

[1] Grain refinement by low boron additions in niobium-rich TiAl-based alloys [J].

Hecht, U. ;

Witusiewicz, V. ;

Drevermann, A. ;

Zollinger, J. .

INTERMETALLICS, 2008, 16 (08) :969-978

[2]

Lamellar orientation control of TiAl alloys under high temperature gradient with a Ti–43Al–3Si seed[J] . Wenzhong Luo,Jun Shen,Zhixian Min,Hengzhi Fu.Journal of Crystal Growth . 2008 (24)

[3]

Lamellar orientation control of Ti-48Al PST crystal by unidirectional solidification[J] . M Takeyama,Y Yamamoto,H Morishima,K Koike,S.Y Chang,T Matsuo.Materials Science ＆ Engineering A . 2002

[4]

Microstructure control of TiAl alloys containing β stabilizers by directional solidification[J] . I.S. Jung,H.S. Jang,M.H. Oh,J.H. Lee,D.M. Wee.Materials Science ＆ Engineering A . 2002

[5] Microstructural control through seeding and directional solidification of TiAl alloys containing Mo and C [J].

Lee, HN ;

Johnson, DR ;

Inui, H ;

Oh, MH ;

Wee, DM ;

Yamaguchi, M .

ACTA MATERIALIA, 2000, 48 (12) :3221-3233

[6] High-temperature structural intermetallics [J].

Yamaguchi, M ;

Inui, H ;

Ito, K .

ACTA MATERIALIA, 2000, 48 (01) :307-322

[7]

Directional solidification of TiAl-base alloys[J] . M Yamaguchi,D.R Johnson,H.N Lee,H Inui.Intermetallics . 2000 (5)

[8]

High temperature phase equilibria near Ti–50 at% Al composition in Ti–Al system studied by directional solidification[J] . In-Soo Jung,Min-Chul Kim,Je-Hyun Lee,Myung-Hoon Oh,Dang-Moon Wee.Intermetallics . 1999 (11)

[9] Gamma titanium aluminide alloys - an assessment within the competition of aerospace structural materials [J].

Dimiduk, DM .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 263 (02) :281-288

[10]

Microstructural control of TiAl–Mo–B alloys by directional solidification[J] . D.R. Johnson,K. Chihara,H. Inui,M. Yamaguchi.Acta Materialia . 1998 (18)

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