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Nanoindentation Creep Behavior of U65Fe30Al5 Amorphous Alloy |
Hongyang XU,Haibo KE,Huogen HUANG,Pei ZHANG,Pengguo ZHANG,Tianwei LIU() |
Institute of Materials, China Academy of Engineering Physics, Jiangyou 621907, China |
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Cite this article:
Hongyang XU,Haibo KE,Huogen HUANG,Pei ZHANG,Pengguo ZHANG,Tianwei LIU. Nanoindentation Creep Behavior of U65Fe30Al5 Amorphous Alloy. Acta Metall Sin, 2017, 53(7): 817-823.
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Abstract Uranium is a valuable nuclear fuel material, but this application is unavoidably handicapped by the easy creep behavior of the metal caused by the combination of stress and irradiation in nuclear reactor. Uranium-based amorphous alloys, as a kind of potential new materials in the nuclear industry, would be challenged by this issue when used in such situation. However, creep properties of these materials have not been reported in the previous studies. In order to preliminarily investigate the creep phenomenon derived from stress function, this work is performed to study the ambient creep behavior of a new amorphous alloy U65Fe30Al5. This alloy was tested by using a nanoindentation technique under different peak loads and loading rates. The results indicate that the creep displacement gradually increases with either the peak load or the loading rate in equal creeping time, but this tendency vanishes when exceeding a critical loading rate. The fitting based on an empirical creep equation reveals that the stress exponent of the alloy ascends when raising the peak load, and firstly declines with the loading rate and then keeps constant above the critical rate. Compared with conventional crystalline alloys, the U-Co-Al alloy shows a larger stress exponent, reflecting the possible existence of rich free volume in the amorphous alloy.
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Received: 21 July 2016
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Fund: Supported by National Natural Science Foundation of China (No.51501169), National Defense Basic Scientific Research (No.B1520133007) and Scientific and Technological Development Foundation of China Academy of Engineering Physics (Nos.2013A0301015 and 2014B0302047) |
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