Creep-deformation behavior of (Mo0.85Nb0.15)Si2 lamellar-structured C40/C11b two-phase crystals

被引：29
作者：
Hagihara, Koji [1 ]
Araki, Haruka [1 ]
Ikenishi, Takaaki [1 ]
Nakano, Takayoshi [2 ]
机构：
[1] Osaka Univ, Grad Sch Engn, Dept Adapt Machine Syst, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
来源：
ACTA MATERIALIA | 2016年 / 107卷
基金：
日本科学技术振兴机构;
关键词：
Transition-metal silicides; Creep test; High-temperature deformation; Lamella; Dislocation; MOSI2; SINGLE-CRYSTALS; PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; FRACTURE-BEHAVIOR; DUPLEX-PHASE; MICROSTRUCTURE; ALLOYS; BINARY; NBSI2; SET;
D O I：
10.1016/j.actamat.2016.01.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The creep-deformation behavior of (Mo0.85Nb0.15)Si-2 crystals that were composed of C40 and C11(b) two-phases with an oriented lamellar microstructure was examined over 1200-1400 degrees C under compression. The creep behavior of the crystals varied greatly depending on the orientation of the loading axis with respect to the lamellar interfaces. The steady-state creep strain rate (SSCR) when the loading orientation was parallel to the lamellar interfaces (0 degrees-orientation) was approximately 2 orders of magnitude lower than that when the loading orientation was inclined by 45 degrees (45 degrees-orientation). Creep tests were performed also with single crystals of C40-single-phase (Mo0.85Nb0.15)Si-2, and proved that the C40-phase effectively acts as a strengthening phase in the creep behavior of the C40/C11(b) duplex-phase crystals. The variant-1-type C11(b) phase grains, which have a loading orientation parallel to [001], were also found to act as an effective strengthening component. The SSCR of the 0 degrees-orientation was succeeded to be further decreased by controlling the lamellar microstructure via the addition of Cr. The SSCR of the 1 at%-Cr-added lamellar-structured crystal under 300 MPa in the 0 degrees-orientation was approximately a third of that of the non-added ternary crystal. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：196 / 212
页数：17
相关论文
共 35 条
[1]   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
[2]   ENGINEERING ASPECT OF CREEP DEFORMATION OF MOLYBDENUM DISILICIDE [J].
BOSE, S .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1992, 155 (1-2) :217-225
[3]   CREEP-BEHAVIOR OF A NI-NI3AL-CR3C2 EUTECTIC COMPOSITE [J].
BULLOCK, E ;
MCLEAN, M ;
MILES, DE .
ACTA METALLURGICA, 1977, 25 (03) :333-344
[4]  
Chadwick G. A., 1975, Metal Science, V9, P300, DOI 10.1179/030634575790444441
[5]   YIELD-POINT ANALYSES IN EUTECTIC ALLOYS [J].
CHADWICK, GA .
ACTA METALLURGICA, 1976, 24 (12) :1137-1146
[6]   STEADY-STATE POWER-LAW CREEP IN HETEROGENEOUS ALLOYS WITH COARSE MICROSTRUCTURES [J].
CHEN, IW ;
ARGON, AS .
ACTA METALLURGICA, 1979, 27 (05) :785-791
[7]  
Hagihara Koji, 2014, Materials Science Forum, V783-786, P1123, DOI 10.4028/www.scientific.net/MSF.783-786.1123
[8]   Indentation fracture behavior of (Mo0.85Nb0.15)Si2 crystals with C40 single-phase and MOSi2(C11b)/NbSi2(C40) duplex-phase with oriented lamellae [J].
Hagihara, K ;
Maeda, S ;
Nakano, T ;
Umakoshi, Y .
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2004, 5 (1-2) :11-17
[9]   Fracture behavior and toughness of NbSi2-based single crystals and MoSi2(C11b)/NbSi2(C40) duplex crystals with a single set of lamellae [J].
Hagihara, K. ;
Nakano, T. .
ACTA MATERIALIA, 2011, 59 (10) :4168-4176
[10]   Improvement of aligned lamellar structure by Cr-addition to NbSi2/MoSi2 duplex-silicide crystals [J].
Hagihara, K. ;
Nakano, T. ;
Hata, S. ;
Zhu, O. ;
Umakoshi, Y. .
SCRIPTA MATERIALIA, 2010, 62 (08) :613-616
1234