Indentation fracture behavior of (Mo0.85Nb0.15)Si2 crystals with C40 single-phase and MOSi2(C11b)/NbSi2(C40) duplex-phase with oriented lamellae

被引：18

作者：

Hagihara, K

Maeda, S

Nakano, T

Umakoshi, Y

机构：

[1] Osaka Univ, Dept Mat Sci & Engn, Grad Sch Engn, Suita, Osaka 5650871, Japan

[2] Osaka Univ, Grad Sch Engn, Handai Frontier Res Ctr, Suita, Osaka 5650871, Japan

来源：

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2004年 / 5卷 / 1-2期

关键词：

mechanical property; silicide fracture toughness; micro-Vickers hardness test;

D O I：

10.1016/j.stam.2003.09.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fracture behavior and toughness of C40-structured (Mo0.85Nb0.15)Si-2 single crystals and MoSi2(C11(b))/NbSi2(C40) duplex-phase crystals with oriented lamellae were investigated by micro-Vickers hardness tests. The indentation fracture toughness in the C40 single-phase showed low values of about 1.0-1.4 MPa m(1/2), while fracture toughness was improved in the duplex-phase crystals. Ductile phase toughening by the C11(b) phase, deflection of crack-propagation at the lamellar boundary and the effect of residual stress field at the crack tip are considered to be responsible for the increment of fracture toughness of MoSi2(C11(b))/NbSi2(C40) duplex-phase crystals. (C) 2003 Elsevier Ltd. All rights reserved.

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页码：11 / 17

页数：7

相关论文

共 19 条

[1] A CRITICAL-EVALUATION OF INDENTATION TECHNIQUES FOR MEASURING FRACTURE-TOUGHNESS .1. DIRECT CRACK MEASUREMENTS [J].

ANSTIS, GR ;

CHANTIKUL, P ;

LAWN, BR ;

MARSHALL, DB .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1981, 64 (09) :533-538

[2] APPLICATION OF TERNARY PHASE-DIAGRAMS TO THE DEVELOPMENT OF MOSI2-BASED MATERIALS [J].

BOETTINGER, WJ ;

PEREPEZKO, JH ;

FRANKWICZ, PS .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1992, 155 (1-2) :33-44

[3] Elastic properties of C40 transition metal disilicides [J].

Chu, F ;

Lei, M ;

Maloy, SA ;

Petrovic, JJ ;

Mitchell, TE .

ACTA MATERIALIA, 1996, 44 (08) :3035-3048

[4] Stacking faults on (001) and their influence on the deformation and fracture behavior of single crystals of MoSi2-WSi2 solid-solutions with the C11b structure [J].

Inui, H ;

Ito, K ;

Nakamoto, T ;

Ishikawa, K ;

Yamaguchi, M .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 314 (1-2) :31-38

[5] PLASTIC-DEFORMATION OF MOSI2 SINGLE-CRYSTALS [J].

ITO, K ;

INUI, H ;

SHIRAI, Y ;

YAMAGUCHI, M .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1995, 72 (04) :1075-1097

[6] MODE OF CHIPPING FRACTURE IN BRITTLE SOLIDS [J].

LAWN, BR ;

SWAIN, MV ;

PHILLIPS, K .

JOURNAL OF MATERIALS SCIENCE, 1975, 10 (07) :1236-1239

[7] Microstructure and high-temperature strength in MoSi2/NbSi2 duplex silicides [J].

Nakano, T ;

Azuma, M ;

Umakoshi, Y .

INTERMETALLICS, 1998, 6 (7-8) :715-722

[8] Effect of substitutational elements on plastic deformation behaviour of NbSi2-based silicide single crystals with C40 structure [J].

Nakano, T ;

Kishimoto, M ;

Furuta, D ;

Umakoshi, Y .

ACTA MATERIALIA, 2000, 48 (13) :3465-3475

[9] Tensile deformation and fracture behaviour in NbSi2 and MoSi2 single crystals [J].

Nakano, T ;

Azuma, M ;

Umakoshi, Y .

ACTA MATERIALIA, 2002, 50 (14) :3731-3742

[10] Microstructure of duplex-phase NbSi2(C40)/MoSi2(C11b) crystals containing a single set of lamellae [J].

Nakano, T ;

Nakai, Y ;

Maeda, S ;

Umakoshi, Y .

ACTA MATERIALIA, 2002, 50 (07) :1781-1795