B19 phase in Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y alloy

被引：21

作者：

Song, L. ^{[1
]}

Xu, X. J. ^{[2
]}

You, L. ^{[1
]}

Liang, Y. F. ^{[1
]}

Lin, J. P. ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Zhongyuan Univ Technol, Mat & Chem Sch, Zhengzhou 450007, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 618卷

基金：

中国国家自然科学基金;

关键词：

Metals and alloys; Microstructure; TEM; Phase transitions; TIAL ALLOYS; MECHANICAL-PROPERTIES; ELASTIC-CONSTANTS; HIGH-NB; MICROSTRUCTURE; DEFORMATION; EVOLUTION;

D O I：

10.1016/j.jallcom.2014.08.137

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The B19 phase is widely observed in the alpha(2) laths in Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y alloy, forming a modulated structure together with the alpha(2) phase. The distortion between the alpha(2) and B19 phases exists only along the [1 (1) over bar 0 0](alpha 2) direction and is very difficult to detect. Thin gamma laths precipitate regularly within the alpha(2) + B19 structure to accommodate the lattice misfit, whereas the sizes of the gamma laths are limited to a small scale. The B19 phase, however, is unstable and was eliminated after annealing at 900 degrees C for 30 min, followed by air-cooling. The pure alpha(2) phase observed in the air-cooled sample is not in the equilibrium state. The B19 phase can be a stable phase in some temperatures below 900 degrees C but be repressed under rapid cooling. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：305 / 310

页数：6

共 19 条

[1] New ordered structure of TiAl studied by high-resolution electron microscopy [J].

Abe, E ;

Kumagai, T ;

Nakamura, M .

INTERMETALLICS, 1996, 4 (04) :327-333

[2] A novel in situ composite structure in TiAl alloys [J].

Appel, F. ;

Oehring, M. ;

Paul, J. D. H. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 493 (1-2) :232-236

[3] Nano-scale design of TiAl alloys based on β-phase decomposition [J].

Appel, F ;

Oehring, M ;

Paul, JDH .

ADVANCED ENGINEERING MATERIALS, 2006, 8 (05) :371-376

[4] Phase transformations during creep of a multiphase TiAl-based alloy with a modulated microstructure [J].

Appel, F. ;

Paul, J. D. H. ;

Oehring, M. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2009, 510-11 :342-349

[5] Electron microscope characterization of low cycle fatigue in a high-strength multiphase titanium aluminide alloy [J].

Appel, Fritz ;

Heckel, Thomas K. ;

Christ, Hans-Juergen .

INTERNATIONAL JOURNAL OF FATIGUE, 2010, 32 (05) :792-798

[6] Deformation and dynamic recrystallization behavior of a high Nb containing TiAl alloy [J].

Cheng, Liang ;

Chang, Hui ;

Tang, Bin ;

Kou, Hongchao ;

Li, Jinshan .

JOURNAL OF ALLOYS AND COMPOUNDS, 2013, 552 :363-369

[7] Microstructures and mechanical properties of TiAl alloys consolidated by spark plasma sintering [J].

Couret, Alain ;

Molenat, Guy ;

Galy, Jean ;

Thomas, Marc .

INTERMETALLICS, 2008, 16 (09) :1134-1141

[8] Modification of the crystallographic structure of γ-TiAl alloyed with iron [J].

Ducher, R ;

Viguier, B ;

Lacaze, J .

SCRIPTA MATERIALIA, 2002, 47 (05) :307-313

[9] Deformation-induced internal stresses in multiphase titanium aluminide alloys [J].

Hoppe, Roland ;

Appel, Fritz .

ACTA MATERIALIA, 2014, 64 :169-178

[10] Microstructure and mechanical properties of high niobium containing TiAl alloys elaborated by spark plasma sintering [J].

Jabbar, Houria ;

Monchoux, Jean-Philippe ;

Houdellier, Florent ;

Dolle, Mickael ;

Schimansky, Frank-Peter ;

Pyczak, Florian ;

Thomas, Marc ;

Couret, Alain .

INTERMETALLICS, 2010, 18 (12) :2312-+

← 1 2 →