期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.09.090
关键词
NiTiNb shape memory alloy; High-energy X-ray diffraction; Phase transformation; Deformation mechanism
类别
资金
- National Natural Science Foundation of China [91126001, 11105128, 51001024]
- Science and Technology Foundation of Chinese Academy of Engineering Physics [2010A0103002]
- Science and Technology Innovation Fund of Institute of Nuclear Physics and Chemistry of Chinese Academy of Engineering Physics [2009CX01]
- Fundamental Research Funds for the Central Universities [N090202001, N100302003]
High-energy synchrotron X-ray diffraction technique was used to in-situ characterize microstructure, lattice strain, and phase transition behavior of a Ni47Ti44Nb9 shape memory alloy. Phase transformation kinetics and deformation mechanisms were studied under a uniaxial tension at three testing temperatures, i.e., - 70 degrees C, 25 degrees C, and 150 degrees C. At a testing temperature of - 70 degrees C, a complicated phase transformation with four stages of micromechanical deformation was identified which is associated with changes of martensite substructures. At room temperature of 25 degrees C, there was no stress-induced selection process of variants of B19' phases observed. Whereas at a testing temperature of 150 degrees C, there was no any phase transformation observed. It is verified that beta-Nb phase, an effective stabilizer for the austenite, delays the process of martensitic transformation and relaxes the strain energy without strengthening the matrix. This new finding is important to understand the relationship between the micromechanical deformation behavior and phase transformations in the Ni47Ti44Nb9 SMA. (C) 2012 Elsevier B.V. All rights reserved.
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