期刊
INTERMETALLICS
卷 13, 期 12, 页码 1263-1268出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2004.07.048
关键词
nickel aluminides, based on NiAl; brittleness and ductility; creep; precipitates
Strengthening through a homogeneous distribution of a second phase is a concept that is widely employed in high-temperature materials. The most prominent among this group are nickel-based superalloys which owe their high-temperature strength to finely dispersed Ni3Al particles. Similar microstructures can be obtained in the Fe-Al-Ni-Cr system with B2-ordered (Ni,Fe)Al precipitates in a ferritic matrix. These precipitates lead to an increase of high-temperature strength compared to conventional iron-base high-temperature alloys. However, secondary precipitates form during air cooling from high temperatures and affect the ductility. The results show that the ductility can be improved by a two-step aging treatment. Within the stress and temperature range investigated, the dependence of the secondary creep rate on the applied stress of aged alloys can be described by a power law if a threshold stress is introduced. (c) 2005 Elsevier Ltd. All rights reserved.
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