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The idea is to mix only a moderate fraction of micrometer-sized grains with a nc/ufg matrix, so as to maintain the most part of the strength¡£ ÉÏÏÂÎÄ At RT, one may need to manipulate the nanostructure to regain strain hardening. One example is the use of a (bimodal) grain size distribution based on nc/ufg structures obtained through thermomechanical treatments [6]. The idea is to mix only a moderate fraction of micrometer-sized grains with a nc/ufg matrix, so as to maintain the most part of the strength. At the same time, the inhomogeneous grain structure offers the opportunity to expeditiously reap the benefits of the strain hardening capacity [6]. |
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