Influence of fiber alignment on creep in directionally solidified NiAl-10Mo in-situ composites

被引：21

作者：

Seemueller, C. ^{[1
]}

Heilmaier, M. ^{[1
]}

Haenschke, T. ^{[2
]}

Bei, H. ^{[3
]}

Dlouhy, A. ^{[4
]}

George, E. P. ^{[3
]}

机构：

[1] Karlsruhe Inst Technol, Div Phys Met, Inst Appl Mat, D-76131 Karlsruhe, Germany

[2] Univ Birmingham, Interdisciplinary Res Ctr Mat Proc, Birmingham B15 2TT, W Midlands, England

[3] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[4] Acad Sci Czech Republic, Inst Phys Met, CS-61662 Brno, Czech Republic

来源：

INTERMETALLICS | 2013年 / 35卷

关键词：

Nickel aluminides; based on NiAl; Creep (properties and mechanisms); Crystal growth; Mechanical properties; theory; Aero-engine components; MO EUTECTIC ALLOY; MECHANICAL-PROPERTIES; NIAL-MO; STEADY-STATE; BEHAVIOR; MICROSTRUCTURES; CHEMISTRY; FRACTURE;

D O I：

10.1016/j.intermet.2012.12.007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A NiAl-Mo eutectic having a nominal composition of Ni-45Al-10Mo was directionally solidified in a floating-zone furnace at two different growth rates, 20 and 80 mm/h. At the slower growth rate, the Mo fibers in the composite are well-aligned with the growth direction, whereas at the higher growth rate cellular microstructures are observed. Creep testing at 900 degrees C showed that the minimum creep rate is much higher for cellular than for well-aligned structures. In the cellular case a "soft" cell boundary consisting primarily of binary NiAl surrounding "hard" eutectic cell interiors seems to facilitate cell boundary sliding and therefore results in low creep strength. A microstructure-based composite model is used to explain the effects of fiber alignment on creep resistance. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：110 / 115

页数：6

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