2013
DOI: 10.1038/ncomms2651
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High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Abstract: Bulk nanostructured metals can attribute both exceptional strength and poor thermal stability to high interfacial content, making it a challenge to utilize them in high-temperature environments. Here we report that a bulk two-phase bimetal nanocomposite synthesised via severe plastic deformation uniquely possesses simultaneous high-strength and high thermal stability. For a bimetal spacing of 10 nm, this composite achieves an order of magnitude increase in hardness of 4.13 GPa over its constituents and maintai… Show more

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Cited by 321 publications
(168 citation statements)
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“…The TB resistance against dislocation motion is much more moderated, thereby both the strength and ductility of metals have been significantly optimized (Lu et al, 2004). Moreover, the nanotwinned (nt) structures show superior thermal stability compared with their ng counterparts (Zhang and Misra, 2012;Zheng et al, 2013;Li et al, 2016), implying a potential applications of nt metals at elevated temperatures. The simulations revealed that the nt-Cu exhibits greater creep resistance with decreasing TB spacing (Jiao and Kulkarni, 2015).…”
mentioning
confidence: 99%
“…The TB resistance against dislocation motion is much more moderated, thereby both the strength and ductility of metals have been significantly optimized (Lu et al, 2004). Moreover, the nanotwinned (nt) structures show superior thermal stability compared with their ng counterparts (Zhang and Misra, 2012;Zheng et al, 2013;Li et al, 2016), implying a potential applications of nt metals at elevated temperatures. The simulations revealed that the nt-Cu exhibits greater creep resistance with decreasing TB spacing (Jiao and Kulkarni, 2015).…”
mentioning
confidence: 99%
“…Very strong, single-crystal like textures, however, are associated with development of a preferred interface character (as defined by five parameters describing the orientation relationship and interface plane), as seen in the Cu-Nb system. [70,71] It is, therefore, unlikely that a prevailing interface forms in Zr-Nb. We therefore conclude that two contrasting SPD behaviors are possible for nanoscale composites: one where texture is driven by grain orientation stabilization as for Zr-Nb composites and one driven by interface character stabilization as in the Cu-Nb composites.…”
mentioning
confidence: 99%
“…This is in remarkable contrast to cubic-based nanolayered systems produced by the same technique.Thus, critical length scales below which sizedependent or interface-driven mechanisms emerge in the hcp-bcc system, should they exist, must lie below 90 nm.Furthermore, based on the exceptional properties discovered for ARB Cu-Nb systems, [9,56,[71][72][73][74] we envision that the Zr-Nb nanolayered material will exhibit many unusual and interesting properties, potentially far exceeding those of current coarse-grained Zr.This study opens up an innovative route to manufacturing hcp and bcc nanostructured metals as well as a novel material for pioneering hcp/bcc interface and nanoscale hcp research.…”
mentioning
confidence: 99%
“…C Interface misfit dislocation patterns and interface-facilitated deformation mechanisms have garnered considerable interest because they are well known to play a critical role in determining the ultimate strength and ductility of nanoscale metallic composites. [1][2][3][4][5][6][7][8] An interface may serve as the source for dislocations, [8][9][10][11][12] carry the plastic flow by interface sliding during shearing, 6,13 provide a barrier for dislocation transmission because of the discontinuity of slip systems across an interface, 5,6,13,14 attract or repel incoming lattice dislocations with respect to the character of interface dislocations, 5,15 trap various point defects by distributing the excess potential energy, etc. Clearly, these interface-mediated phenomena are generally associated with the characteristics of various interface misfit dislocations, whose structure and configuration govern the interface-facilitated deformation mechanism.…”
mentioning
confidence: 99%