High temperature creep behavior of oxide dispersion strengthened NiAl intermetallics

被引：47
作者：
Arzt, E
Grahle, P
机构：
[1] Univ Stuttgart, Max Planck Inst Met Forsch, D-70174 Stuttgart, Germany
[2] Univ Stuttgart, Inst Met Kunde, D-70174 Stuttgart, Germany
来源：
ACTA MATERIALIA | 1998年 / 46卷 / 08期
关键词：
D O I：
10.1016/S1359-6454(97)00474-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The intermetallic compound NiAl is a promising candidate material for high-temperature applications, provided its creep strength can be raised by some strengthening strategy. Oxide-dispersion strengthened (ODS) NiAl has been produced by powder-metallurgical methods and its creep behavior at temperatures up to 1723 K (1450 degrees C) has been studied. Exceptional creep properties, with high stresses and stress sensitivities when compared to dispersoid-free NiAl, are found, which confirms the effectiveness of dispersion strengthening in this material. The creep behavior is interpreted in the light of creep models. Detachment-controlled models satisfactorily describe the deformation in coarse-grained ODS-NiAl, but modifications are necessary for fine-grained material. In technical terms, ODS-NiAl recommends itself as a strong, light and oxidation-resistant high-temperature alloy for applications up to 1700 K. (C) 1998 Acta Metallurgica Inc.
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页码：2717 / 2727
页数：11
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