期刊
SCRIPTA MATERIALIA
卷 68, 期 8, 页码 571-574出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2012.11.042
关键词
Shape memory alloys; NiTi; Martensite reorientation; Dynamic modulus; Neutron diffraction
类别
资金
- NASA Fundamental Aeronautics Program, Aeronautical Sciences and Fixed Wing Projects
- Division of Scientific User Facilities, Office of Basic Energy Sciences, US Department of Energy [DE-AC05- 00OR22725]
The mechanical and microstructural behavior of a polycrystalline Ni49.9Ti50.1 (at.%) shape memory alloy was investigated as a function of temperature around the transformation regime. The bulk macroscopic responses, measured using ex situ tensile deformation and impulse excitation tests, were compared to the microstructural evolution captured using in situ neutron diffraction. The onset stress for inelastic deformation and dynamic Young's modulus were found to decrease with temperature in the martensite regime followed by an increase starting near the austenite start temperature, attributed to the reverse transformation. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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