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2018 ; 8
(1
): 5088
Nephropedia Template TP
Cao SC
; Liu J
; Zhu L
; Li L
; Dao M
; Lu J
; Ritchie RO
Sci Rep
2018[Mar]; 8
(1
): 5088
PMID29572533
show ga
Materials can be made strong, but as such they are often brittle and prone to
fracture when under stress. Inspired by the exceptionally strong and ductile
structure of byssal threads found in certain mussels, we have designed and
manufactured a multi-hierarchical steel, based on an inexpensive austenitic
stainless steel, which defeats this "conflict" by possessing both superior
strength and ductility. These excellent mechanical properties are realized by
structurally introducing sandwich structures at both the macro- and nano-scales,
the latter via an isometric, alternating, dual-phase crystal phases comprising
nano-band austenite and nano-lamellar martensite, without change in chemical
composition. Our experiments (transmission and scanning electron microscopy,
electron back-scattered diffraction, nano-indentation and tensile tests) and
micromechanics simulation results reveal a synergy of mechanisms underlying such
exceptional properties. This synergy is key to the development of vastly superior
mechanical properties, and may provide a unique strategy for the future
development of new super strong and tough (damage-tolerant), lightweight and
inexpensive structural materials.
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