منابع مشابه
accumulation of heavy metals (cu, zn, cd and pb) in sediment and selected organisms in lukut river, negrisembilan, malaysia, and toxocological studies of heavy metals (cu, zn, cd and pb) on penaeus monodon (fabricius, 1798) juveniles
چکیده ندارد.
15 صفحه اولParadox of strength and ductility in metals processed by severe plastic deformation
It is well known that plastic deformation induced by conventional forming methods such as rolling, drawing or extrusion can significantly increase the strength of metals However, this increase is usually accompanied by a loss of ductility. For example, Fig. 1 shows that with increasing plastic deformation, the yield strength of Cu and Al monotonically increases while their elongation to failure...
متن کاملInterfacial plasticity governs strain rate sensitivity and ductility in nanostructured metals.
Nano-twinned copper exhibits an unusual combination of ultrahigh strength and high ductility, along with increased strain-rate sensitivity. We develop a mechanistic framework for predicting the rate sensitivity and elucidating the origin of ductility in terms of the interactions of dislocations with interfaces. Using atomistic reaction pathway calculations, we show that slip transfer reactions ...
متن کاملTowards strength–ductility synergy through the design of heterogeneous nanostructures in metals
Metals can be processed to reach ultra-high strength, but usually at a drastic loss of ductility. Here, we review recent advances in overcoming this tradeoff, by purposely deploying heterogeneous nanostructures in an otherwise single-phase metal. Several structural designs are being explored, including bimodal, harmonic, lamellar, gradient, domain-dispersed, and hierarchical nanostructures. The...
متن کاملAre nanotwinned structures in fcc metals optimal for strength, ductility and grain stability?
The optimality of nanotwinned structures in imparting maximum strength and stability has been investigated by performing atomistic simulations of dislocation interactions with various types of grain boundaries. By developing an understanding of the mechanism of the instability, we predict that nanocrystalline metals with grain sizes below 50 ± 10 nm or 70 ± 10 nm (in Cu) are inherently unstable...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1869
ISSN: 0036-8733
DOI: 10.1038/scientificamerican11271869-341