Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys

Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys were thermodynamically and experimentally investigated in present work. According to the thermodynamic analysis, the critical stress presents the same linear relationship with martensitic transf...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-07, Vol.700, p.269-280
Main Authors: Fan, Q.C., Zhang, Y.H., Wang, Y.Y., Sun, M.Y., Meng, Y.T., Huang, S.K., Wen, Y.H.
Format: Article
Language:English
Subjects:
Aging
Aging (metallurgy)
Concentration (composition)
Deformation
Intermetallic compounds
Martensitic transformations
Microstructure
Nickel alloys
Nickel base alloys
Nickel compounds
Nickel titanides
NiTi shape memory alloy
Phase transitions
Precipitates
Precipitation
Strengthening mechanism
Titanium alloys
Titanium compounds
Transformation temperature
Yield strength
Yield stress
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Summary:Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys were thermodynamically and experimentally investigated in present work. According to the thermodynamic analysis, the critical stress presents the same linear relationship with martensitic transformation temperature for all Ni-rich NiTi alloys. The thermodynamic results were demonstrated by the experimental results after aging treatment of Ni-rich NiTi alloys with compositions of 51.5, 51 and 50.5at% Ni, even for the aged alloys with R phase transformation. Meanwhile, evolution of precipitate size and volume fraction was clearly discussed for Ni-rich NiTi alloys with different aging conditions. Different from the critical stress, transformation behavior presents no obvious influence on the yield stress of the Ni-rich NiTi alloys. The yield stress is mainly determined by Ni4Ti3 precipitates, which increases with increasing the precipitate volume fraction and decreases with increasing the precipitate size.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.05.107