The conflicts between strength and toughness.

By R. Ritchie. Nature Materials, 2011

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L1_2-strengthened high-entropy alloys for advanced structural applications (2018, background): “However, most conventional alloys designed based on one single-principle element gradually show a serious embrittlement effect with increasing strength, following the long-standing dilemma of strength-ductility trade-off.(1,2) Multicomponent highentropy alloys (HEAs), emerging as a new class of meta”
Bioinspired structural materials. (2014, background): “In basic terms, there are two fundamental challenges facing researchers in the field of bioinspired materials: (1) to devise approaches for translating design motifs found in natural materials to a wider range of material combinations; and (2) to create methods for making bioinspired structural mat”
High cycle fatigue life prediction of laser additive manufactured stainless steel: A machine learning approach (2019, background): “For the post-processed parts, the increase in postprocessing intensity is associated with lower strength but higher ductility, in compliance with the strength-ductility trade-off that is typical of structural metals [55].”