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- W4292223624 abstract "Instrumented indentation has demonstrated the capability of characterizing plastic instabilities at small scales. Nevertheless, due to the complex nature of stress and strain, it is challenging to use the results from indentation for quantitative evaluations of the Portevin–Le Chatelier (PLC) effect and the dynamic strain aging mechanisms. Here, we addressed this problem by correlating the plastic instabilities occurring in indentation to the PLC effect in uniaxial tension. A twinning-induced plasticity steel with notable PLC effect was used as the model material. Indentation tests were systematically carried out on single grains of a coarse-grained sample over a wide range of indentation strain rates from 5 × 10 −4 to 10 0 s −1 . For a direct comparison, uniaxial tensile tests coupled with digital image correlation were conducted on bulk polycrystalline samples at the equivalent uniaxial strain rates. It is demonstrated that indentation provides similar results for the respective ranges of strain rates for serrated plastic flow and negative strain rate sensitivity (nSRS), the value of nSRS, and the rate dependence of serration size, compared to those by uniaxial tension. In contrast to uniaxial tension, serrations in indentation may become stochastic at lower rates due to the limited sample volume. In addition, individual indentation serrations were also analyzed to reveal the physics behind their formation and rate dependent characteristics." @default.
- W4292223624 created "2022-08-18" @default.
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- W4292223624 date "2022-09-01" @default.
- W4292223624 modified "2023-10-01" @default.
- W4292223624 title "Correlations between the plastic instabilities occurring in indentation and the Portevin Le-Chatelier effect in uniaxial tension" @default.
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- W4292223624 doi "https://doi.org/10.1016/j.msea.2022.143799" @default.
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