Abstract Scope |
Owing to the practically infinite compositional space of the multicomponent high-entropy alloys (HEAs), unique combination of strengthening mechanisms can be invoked to achieve excellent mechanical properties. For instance, apart from the intrinsic massive solid solution strengthening effect, we have obtained a joint activation of twinning- and transformation-induced plasticity effects in a series of HEAs by rendering them metastable. In this talk, we will introduce some of the new ideas that our group has recently developed for strengthening multicomponent HEAs. One of them is about the strategy of dynamic “bidirectional transformation induced plasticity (B-TRIP)” effect triggered in our materials by local dissipative heating and local micromechanical fields, which can also be further tuned by interstitial atoms. Another is about the concept of simultaneously triggering both nanosized shearable kappa-carbides and non-shearable B2 particles (dual-nanoprecipitation) in ultrastrong lightweight HEAs. Some other novel ideas for strengthening multicomponent HEAs may also be briefly introduced. |