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Abstract: In this paper, we review recent progress in the understanding of a novel dislocation mechanism, named correlated necklace dislocations (CNDs), activated in highly oriented nanotwinned (NT) metals under monotonic and cyclic loading applied parallel to the twin boundaries (TBs). This mechanism was initially revealed to be responsible for the continuous strengthening behavior of NT metals when the TB spacing (λ) is reduced to around 1 nm. It was later found that the presence of a crack-like defect could trigger the operation of CNDs at much larger TB spacings. Most recently, atomistic modeling and experiments demonstrated a history-independent and stable cyclic response of highly oriented NT metals governed by CNDs formed in the NT structure under cyclic loading. CNDs move along the twin planes without directional lattice slip resistance, thus contributing to a symmetric cyclic response of the NT structure regardless of pre-strains imposed on the sample before cyclic loading. We conclude with potential research directions in the investigation of this unique deformation mechanism in highly oriented NT metals.

择优取向纳米孪晶金属中的"链式"关联位错

[1]Beyerlein IJ, Zhang XH, Misra A, 2014. Growth twins and deformation twins in metals. Annual Review of Materials Research, 44:329-363.

[2]Bufford DC, Wang YM, Liu Y, et al., 2016. Synthesis and microstructure of electrodeposited and sputtered nanotwinned face-centered-cubic metals. MRS Bulletin, 41(4):286-291.

[3]Hanlon T, Kwon YN, Suresh S, 2003. Grain size effects on the fatigue response of nanocrystalline metals. Scripta Materialia, 49(7):675-680.

[4]Hodge AM, Wang YM, Barbee Jr TW, 2008. Mechanical deformation of high-purity sputter-deposited nano-twinned copper. Scripta Materialia, 59(2):163-166.

[5]Huang Q, Yu DL, Xu B, et al., 2014. Nanotwinned diamond with unprecedented hardness and stability. Nature, 510(7504):250-253.

[6]Jang DC, Li XY, Gao HJ, et al., 2012. Deformation mechanisms in nanotwinned metal nanopillars. Nature Nanotechnology, 7(9):594-601.

[7]Li L, Ghoniem NM, 2009. Twin-size effects on the deformation of nanotwinned copper. Physical Review B, 79(7):075444.

[8]Li YP, Zhang GP, 2010. On plasticity and fracture of nanostructured Cu/X (X=Au, Cr) multilayers: the effects of length scale and interface/boundary. Acta Materialia, 58(11):3877-3887.

[9]Li YS, Tao NR, Lu K, 2008. Microstructural evolution and nanostructure formation in copper during dynamic plastic deformation at cryogenic temperatures. Acta Materialia, 56(2):230-241.

[10]Lu K, Lu L, Suresh S, 2009. Strengthening materials by engineering coherent internal boundaries at the nanoscale. Science, 324(5925):349-352.

[11]Lu L, Shen YF, Chen XH, et al., 2004. Ultrahigh strength and high electrical conductivity in copper. Science, 304(5669):422-426.

[12]Lu L, Chen X, Huang X, et al., 2009. Revealing the maximum strength in nanotwinned copper. Science, 323(5914):607-610.

[13]Lu QH, You ZS, Huang XX, et al., 2017. Dependence of dislocation structure on orientation and slip systems in highly oriented nanotwinned Cu. Acta Materialia, 127: 85-97.

[14]Ma E, Wang YM, Lu QH, et al., 2004. Strain hardening and large tensile elongation in ultrahigh-strength nano-twinned copper. Applied Physics Letters, 85(21):4932-4934.

[15]Misra A, Hirth JP, Hoagland RG, 2005. Length-scale-dependent deformation mechanisms in incoherent metallic multilayered composites. Acta Materialia, 53(18):4817-4824.

[16]Mughrabi H, Höppel HW, 2010. Cyclic deformation and fatigue properties of very fine-grained metals and alloys. International Journal of Fatigue, 32(9):1413-1427.

[17]Nix WD, 1998. Yielding and strain hardening of thin metal films on substrates. Scripta Materialia, 39(4-5):545-554.

[18]Pan QS, Lu QH, Lu L, 2013. Fatigue behavior of columnar-grained Cu with preferentially oriented nanoscale twins. Acta Materialia, 61(4):1383-1393.

[19]Pan QS, Zhou HF, Lu QH, et al., 2017. History-independent cyclic response of nanotwinned metals. Nature, 551(7679):214-217.

[20]Pan QS, Zhou HF, Lu QH, et al., 2019. Asymmetric cyclic response of tensile pre-deformed Cu with highly oriented nanoscale twins. Acta Materialia, 175:477-486.

[21]Pineau A, Benzerga AA, Pardoen T, 2016. Failure of metals III: fracture and fatigue of nanostructured metallic materials. Acta Materialia, 107:508-544.

[22]Qin EW, Lu L, Tao NR, et al., 2009. Enhanced fracture toughness of bulk nanocrystalline Cu with embedded nanoscale twins. Scripta Materialia, 60(7):539-542.

[23]Shute CJ, Myers BD, Xie S, et al., 2011. Detwinning, damage and crack initiation during cyclic loading of Cu samples containing aligned nanotwins. Acta Materialia, 59(11):4569-4577.

[24]Tian YJ, Xu B, Yu DL, et al., 2013. Ultrahard nanotwinned cubic boron nitride. Nature, 493(7432):385-388.

[25]Wang J, Li N, Anderoglu O, et al., 2010. Detwinning mechanisms for growth twins in face-centered cubic metals. Acta Materialia, 58(6):2262-2270.

[26]Wang JW, Sansoz F, Huang JY, et al., 2013. Near-ideal theoretical strength in gold nanowires containing angstrom scale twins. Nature Communications, 4:1742.

[27]Was GS, Foecke T, 1996. Deformation and fracture in microlaminates. Thin Solid Films, 286(1-2):1-31.

[28]Wu ZX, Zhang YW, Srolovitz DJ, 2009. Dislocation–twin interaction mechanisms for ultrahigh strength and ductility in nanotwinned metals. Acta Materialia, 57(15):4508-4518.

[29]Yan FK, Liu GZ, Tao NR, et al., 2012. Strength and ductility of 316L austenitic stainless steel strengthened by nano-scale twin bundles. Acta Materialia, 60(3):1059-1071.

[30]Yan FK, Tao NR, Archie F, et al., 2014. Deformation mechanisms in an austenitic single-phase duplex microstructured steel with nanotwinned grains. Acta Materialia, 81:487-500.

[31]You ZS, Lu L, Lu K, 2011. Tensile behavior of columnar grained Cu with preferentially oriented nanoscale twins. Acta Materialia, 59(18):6927-6937.

[32]Zhang X, Wang H, Chen XH, et al., 2006. High-strength sputter-deposited Cu foils with preferred orientation of nanoscale growth twins. Applied Physics Letters, 88(17):173116.

[33]Zhang Y, Tao NR, Lu K, 2011. Effects of stacking fault energy, strain rate and temperature on microstructure and strength of nanostructured Cu-Al alloys subjected to plastic deformation. Acta Materialia, 59(15):6048-6058.

[34]Zhou HF, Gao HJ, 2015. A plastic deformation mechanism by necklace dislocations near crack-like defects in nanotwinned metals. Journal of Applied Mechanics, 82(7):071015.

[35]Zhou HF, Qu SX, Yang W, 2010. Toughening by nano-scaled twin boundaries in nanocrystals. Modelling and Simulation in Materials Science and Engineering, 18(6):065002.

[36]Zhou HF, Li XY, Qu SX, et al., 2014. A jogged dislocation governed strengthening mechanism in nanotwinned metals. Nano Letters, 14(9):5075-5080.

[37]Zhu T, Gao HJ, 2012. Plastic deformation mechanism in nanotwinned metals: an insight from molecular dynamics and mechanistic modeling. Scripta Materialia, 66(11):843-848.