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.

引用

页码：196 / 212

页数：17

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