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- W2890571522 abstract "The classical precipitation-strengthening models, described by either the Orowan mechanism or the cutting mechanism, rely on a single average size and dispersion of the precipitates obtained by the experimental observations. However, the continuous unimodal or multimodal size-distribution precipitates are formed in the alloy matrix, and always interact with dislocations via not only the looping mechanism but also the cutting mechanism although the precipitation size is larger than the critical size for determining the looping or cutting mechanism. Here, we propose a new precipitation-strengthening theory, which is a probability-dependent precipitation-strengthening mechanism, to more accurately predict the strengthening contribution of precipitates. The yielding strength obtained from the probability-dependent precipitation-strengthening model is in good agreement with the result of experiments, which is more accurately estimated, compared to the prediction of the classical precipitation-strengthening model, in particular, for the large precipitation size. In addition, the difference of the tensile strength from the classical model and our model comes from not only the origin of the probability-related Orowan bypassing mechanism, but also the origin of the strengthening of the precipitation-size lognormal distribution based on the statistical theory. Moreover, the range of the optimal precipitation radius is predicted at various precipitate-volume fractions, to help discover the high strength of advanced nickel-base superalloys. It is believed that these results will provide a framework for modeling and analyzing the strengthening mechanism of metal materials with the lognormal distributions of the precipitate size and grain size, revealed by the statistical theory." @default.
- W2890571522 created "2018-09-27" @default.
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- W2890571522 date "2019-01-01" @default.
- W2890571522 modified "2023-10-15" @default.
- W2890571522 title "A statistical theory of probability-dependent precipitation strengthening in metals and alloys" @default.
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- W2890571522 doi "https://doi.org/10.1016/j.jmps.2018.09.010" @default.
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