Thermal exposure induced α2+γ→B2(ω) and α2→B2(ω) phase transformations in a high Nb fully lamellar TiAl alloy

被引：67

作者：

Huang, ZW ^{[1
]}

Voice, W

Bowen, P

机构：

[1] Univ Birmingham, Sch Engn, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Rolls Royce PLC, Derby DE2 8BJ, England

来源：

SCRIPTA MATERIALIA | 2003年 / 48卷 / 01期

关键词：

TiAl alloy; stability; phase transformations; transmission electron microscopy;

D O I：

10.1016/S1359-6462(02)00350-0

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

As-HIPped Ti-44Al-8Nb-IB was exposed to 700 degreesC air for up to 3000 h. It has been found that the beta phase removed by hot isostatic pressing (HIPping) reforms as ordered B2 with omega phase during parallel decomposition of alpha(2) lamellae to alpha(2) + gamma lamellae and perpendicular decomposition of single alpha(2) laths into alpha(2) short sections, causing phase transformations of alpha(2) + gamma --> B2(omega) and alpha(2) --> B2(omega). (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：79 / 84

页数：6

共 7 条

[1] DEFORMATION PROCESSES RELATED TO INTERFACIAL BOUNDARIES IN 2-PHASE GAMMA-TITANIUM ALUMINIDES [J].

APPEL, F ;

BEAVEN, PA ;

WAGNER, R .

ACTA METALLURGICA ET MATERIALIA, 1993, 41 (06) :1721-1732

[2] The decomposition of the beta phase in Ti-44Al-8Nb and Ti-44Al-4Nb-4Zr-0.2Si alloys [J].

Cheng, TT ;

Loretto, MH .

ACTA MATERIALIA, 1998, 46 (13) :4801-4819

[3] Creep induced α2→β2 phase transformation in a fully-lamellar TiAl alloy [J].

Du, XW ;

Zhu, J ;

Zhang, X ;

Cheng, ZY ;

Kim, YW .

SCRIPTA MATERIALIA, 2000, 43 (07) :597-602

[4] The effects of long-term air exposure on the stability of lamellar TiAl alloys [J].

Huang, ZW ;

Voice, W ;

Bowen, P .

INTERMETALLICS, 2000, 8 (04) :417-426

[5] Thermal stability of Ti-46Al-5Nb-1W alloy [J].

Huang, ZW ;

Voice, WE ;

Bowen, P .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 329 :435-445

[6]

Huang ZW, 2000, P INT C TI ALL EL TE, P277

[7] Interfacial dislocation mechanism for diffusional phase transformations exhibiting martensitic crystallography:: Formation of TiAl+Ti3Allamellae [J].

Pond, RC ;

Shang, P ;

Cheng, TT ;

Aindow, M .

ACTA MATERIALIA, 2000, 48 (05) :1047-1053

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