期刊
KOVOVE MATERIALY-METALLIC MATERIALS
卷 50, 期 5, 页码 309-318出版社
REDAKCIA KOVOVE MATERIALY
DOI: 10.4149/km_2012_5_309
关键词
shape memory alloy; TiNi; superelasticity; martensitic transformation; tension test; acoustic emission
资金
- Polish Ministry of Science and Higher Education [501220837]
- Polish National Center of Science [2011/01/M/ST8/07754]
- Japan Society for the Promotion of Science (JSPS)
TiNi shape memory alloy (SMA) specimens have been subjected to tension carried out at various strain rates. The goal was to investigate a nucleation and development of the stress-induced martensitic transformation by infrared (IR) and acoustic emission (AE) techniques. Therefore, both the infrared radiation and acoustic emission data were recorded using a fast infrared camera and acoustic emission set-up, respectively. It has been shown that the initial, macroscopically homogeneous transformation initiates in the elastic stage of the deformation even before the stress-strain curve knee and formation of the localized transformation bands. It has also been found that the homogeneous transformation occurs at similar stress level for all strain rates applied, while the localized martensitic transformation depends on the strain rate. Nucleation and development of the localized transformation bands, detected by the infrared camera, were confirmed by acoustic emission technique. The differences between the IR and AE activities were recorded during the TiNi SMA loading and unloading process, manifesting different dynamics of the stress-induced martensitic forward and reverse transformation.
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