Abstract
The stress–strain behavior and strain rate sensitivity of pre-strained Ni80Cr20 (Ni20Cr) were studied at strain rates from 4.8×10–4 s–1 to 1.1×10–1 s–1. Specimens were prepared through cold drawing with abnormal plastic deformation. The texture of the specimen was characterized using electron backscatter diffraction. Results revealed that the ultimate tensile strength and ductility of the pre-strained Ni20Cr microwires simultaneously increased with increasing strain rate. Twinning-induced negative strain rate sensitivity was discovered. Positive strain rate sensitivity was present in fracture flow stress, whereas negative strain rate sensitivity was detected in flow stress values of σ0.5% and σ1%. Tensile test of the pre-strained Ni20Cr showed that twinning deformation predominated, whereas dislocation slip deformation dominated when twinning deformation reached saturation. The trends observed in the fractions of 2°-5°, 5°-15°, and 15°-180° grain boundaries confirmed that twinning deformation dominated the first stage.
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Acknowledgements
Funded by the National Nature Science Foundation of China (No. 11135007). The authors are grateful to analyzing & measure group of General Research Institute for Nonferrous Metal, GRINM, for his valuable cooperation in EBSD analysis of the specimens.
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Funded by the National Natural Science Foundation of China (No. 11135007)
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Zhou, X., Qi, Y., Liu, X. et al. Effects of Strain Rate and Texture on the Tensile Behavior of Pre-strained NiCr Microwires. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 459–465 (2018). https://doi.org/10.1007/s11595-018-1845-4
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DOI: https://doi.org/10.1007/s11595-018-1845-4