Effects of lamellar spacing on mechanical properties of fully lamellar Ti-39.4mol%Al alloy

被引：52

作者：

Maruyama, K ^{[1
]}

Yamada, N

Sato, H

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Hirosaki Univ, Fac Sci & Technol, Dept Intelligent Machine & Syst Engn, Hirosaki, Aomori 0368561, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2001年 / 319卷

基金：

日本学术振兴会;

关键词：

titanium aluminide; lamellar microstructure; lamellar spacing; yield stress; fracture; Hall-Petch relation;

D O I：

10.1016/S0921-5093(01)00926-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Effects of lamellar spacing on mechanical properties of a fully lamellar TiAl alloy were investigated at room temperature and at 950K by compression tests. Lamellar spacing was varied from 20 to 590 nm, keeping the same grain size of 90 mum. The Hall-Petch relation holds between lamellar spacing and yield stress of the alloy. However, the yield stress saturates at a value of about 1 GPa below a critical lamellar spacing of about 100 nm. The Hall-Petch slope, critical lamellar spacing and saturation stress can be explained consistently by the pile-up model of dislocations at lamellar interfaces. Contrary to the beneficial effect on yield stress. the refinement of lamellar spacing deteriorates ductility of the alloy probably due to the suppression of the hard deformation modes. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：360 / 363

页数：4

共 12 条

[1]

[Anonymous], 1970, SCI TECHNOLOGY APPL, DOI DOI 10.1016/B978-0-08-006564-9.50071-3

[2]

Beddoes J, 1997, MAT RES S C, V460, P293

[3] The role of grain size and selected microstructural parameters in strengthening fully lamellar TiAl alloys [J].

Dimiduk, DM ;

Hazzledine, PM ;

Parthasarathy, TA ;

Seshagiri, S ;

Mendiratta, MG .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1998, 29 (01) :37-47

[4]

KIM YW, 1994, JOM-J MIN MET MAT S, V46, P30, DOI 10.1007/BF03220745

[5] Microstructural control and mechanical properties of dual-phase TiAl alloys [J].

Liu, CT ;

Maziasz, PJ .

INTERMETALLICS, 1998, 6 (7-8) :653-661

[6] Effects of lamellar spacing, volume fraction and grain size on creep strength of fully lamellar TiAl alloys [J].

Maruyama, K ;

Yamamoto, R ;

Nakakuki, H ;

Fujitsuna, N .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 240 :419-428

[7] Development of ultrafine lamellar structures in two-phase γ-TiAl alloys [J].

Maziasz, PJ ;

Liu, CT .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1998, 29 (01) :105-117

[8] Strengthening of fully-lamellar TiAl: a dislocation pileup analysis [J].

Sun, YQ .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 240 :131-136

[9] THE ROLE OF ORDERED DOMAINS AND SLIP MODE OF ALPHA-2 PHASE IN THE PLASTIC BEHAVIOR OF TIAL CRYSTALS CONTAINING ORIENTED LAMELLAE [J].

UMAKOSHI, Y ;

NAKANO, T .

ACTA METALLURGICA ET MATERIALIA, 1993, 41 (04) :1155-1161

[10]

YAMADA N, 1999, JSPS, V40, P273

← 1 2 →