Mechanical properties of Mo5SiB2 single crystals

被引：91

作者：

Ihara, K ^{[1
]}

Ito, K ^{[1
]}

Tanaka, K ^{[1
]}

Yamaguchi, M ^{[1
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2002年 / 329卷

关键词：

Mo5SiB2; elastic moduli; hardness; fracture toughness; slip systems;

D O I：

10.1016/S0921-5093(01)01575-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mo5SiB2 is a new refractory metal silicide with great potential for ultra-high temperature structural applications. We succeeded to grow high purity single crystals of Mo5SiB2 using an optical floating zone method. Single-crystal elastic constants at room temperature (RT) of the silicide were measured. Mo5SiB2. has less anisotropic single crystal elastic moduli and a lower shear modulus and a lower Debye temperature than MoSi2. Mo5SiB2, has a slightly higher bulk, shear. Young's moduli and Debye temperature than Mo5Si3, Mo5SiB3, has a RT Vickers hardness of around 18 GPa, which is much larger than those of Mo5Si3 and MoSi2 Fracture toughness around 2 Mparootm is comparable to those of Mo5Si3 and MoSi2. Compression tests were performed at 1500 degreesC. Slip was observed on [001](010) for [021] orientation. However, slip on <100>(001), which has been reported to be activated, was not observed. Mechanical properties of Mo5SiB2 single crystals are discussed in relation to the complex crystal structure of Mo5SiB2. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：222 / 227

页数：6

共 22 条

[11] Compressive creep behavior of Mo5Si3 with the addition of boron [J].

Meyer, MK ;

Kramer, MJ ;

Akinca, M .

INTERMETALLICS, 1996, 4 (04) :273-281

[12]

MIYOSHI T, 1989, T JPN SOC MECH ENG A, V51, P2489

[13]

NUNES CA, 1997, STRUCTURAL INTERMETA, P831

[14] Mechanical properties of monocrystalline C11(b) MoSi2 with small aluminum additions [J].

Peralta, P ;

Maloy, SA ;

Chu, F ;

Petrovic, JJ ;

Mitchell, TE .

SCRIPTA MATERIALIA, 1997, 37 (10) :1599-1604

[15] RELATIONS BETWEEN THE ELASTIC MODULI AND THE PLASTIC PROPERTIES OF POLYCRYSTALLINE PURE METALS [J].

PUGH, SF .

PHILOSOPHICAL MAGAZINE, 1954, 45 (367) :823-843

[16] The formation of Mo precipitates in a supersaturated Mo5SiB2 intermetallic phase [J].

Sakidja, R ;

Sieber, H ;

Perepezko, JH .

PHILOSOPHICAL MAGAZINE LETTERS, 1999, 79 (06) :351-357

[17] Microstructure and mechanical properties of Mo-Mo3Si-Mo5SiB2 silicides [J].

Schneibel, JH ;

Liu, CT ;

Easton, DS ;

Carmichael, CA .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 261 (1-2) :78-83

[18] Assessment of processing routes and strength of a 3-phase molybdenum boron silicide (Mo5Si3-Mo5SiB2-Mo3Si) [J].

Schneibel, JH ;

Liu, CT ;

Heatherly, L ;

Kramer, MJ .

SCRIPTA MATERIALIA, 1998, 38 (07) :1169-1176

[19] Single-crystal elastic constants of MoSi2 with the C11b structure [J].

Tanaka, K ;

Onome, H ;

Inui, H ;

Yamaguchi, M ;

Koiwa, M .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1997, 240 :188-194

[20] Single-crystal elastic constants of gamma-TiAl [J].

Tanaka, K ;

Ichitsubo, T ;

Inui, H ;

Yamaguchi, M ;

Koiwa, M .

PHILOSOPHICAL MAGAZINE LETTERS, 1996, 73 (02) :71-78

← 1 2 3 →