Anomalous Tensile Detwinning in Twinned Nanowires

Cheng, Guangming; Yin, Sheng; Chang, Tzu-Hsuan; Richter, Gunther; Gao, Huajian; Zhu, Yong

doi:10.1103/physrevlett.119.256101

Cited by 53 publications

(55 citation statements)

References 43 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This specific hardening behavior was also observed in the five-fold NT Ag nanowires [ 22 ]. Moreover, the obvious strengthening effect by CTBs is found and enhances with the decrease in the twin spacing, as shown in Figure 2 a,b, which has been widely reported and well understood in literatures [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ].…”

Section: Resultssupporting

confidence: 61%

“…An attractive strategy is engineering coherent twin boundaries (CTBs) with nanometer-scale spacing into nanowires, i.e., nanotwinned nanowires (NT nanowires). Several NT nanowires are founded to exhibit extreme-high strength and even ideal strength, such as NT Cu [ 13 , 14 , 15 ], Ni [ 16 , 17 ], Au [ 8 , 18 , 19 ], Ag [ 20 , 21 ], and Al [ 21 ]. Interestingly, the desired strain hardening capability can be rebuilt in low stacking-fault energy metals nanowires, such as NT Au and NT Ag nanowires containing orthogonally oriented CTBs [ 21 , 22 ] and fivefold vertical CTBs [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rebuilding the Strain Hardening at a Large Strain in Twinned Au Nanowires

et al. 2018

View full text Add to dashboard Cite

Metallic nanowires usually exhibit ultrahigh strength but low tensile ductility, owing to their limited strain hardening capability. Here, our larger scale molecular dynamics simulations demonstrated that we could rebuild the highly desirable strain hardening behavior at a large strain (0.21 to 0.31) in twinned Au nanowires by changing twin orientation, which strongly contrasts with the strain hardening at the incipient plastic deformation in low stacking-fault energy metals nanowires. Because of this strain hardening, an improved ductility is achieved. With the change of twin orientation, a competing effect between partial dislocation propagation and twin migration is observed in nanowires with slant twin boundaries. When twin migration gains the upper hand, the strain hardening occurs. Otherwise, the strain softening occurs. As the twin orientation increases from 0° to 90°, the dominating deformation mechanism shifts from slip-twin boundary interaction to dislocation slip, twin migration, and slip transmission in sequence. Our work could not only deepen our understanding of the mechanical behavior and deformation mechanism of twinned Au nanowires, but also provide new insights into enhancing the strength and ductility of nanowires by engineering the nanoscale twins.

show abstract

Section: Resultssupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Rebuilding the Strain Hardening at a Large Strain in Twinned Au Nanowires

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In <110> loading direction, a high density of sessile dislocation networks formed at the twin boundary, while in <112> loading direction, a lower density of glissile dislocation networks was observed [19]. In nanopillar containing a single axial twin boundary, Cheng et al [20] reported the complete annihilation of twin boundary leading to the formation of a single crystal, which has been attributed to anomalous de-twinning mechanism. However, the influence of twin boundary spacing has not been investigated when the twin boundaries are parallel to the loading direction.…”

Section: Introductionmentioning

confidence: 99%

Role of axial twin boundaries on deformation mechanisms in Cu nanopillars

Rohith

Sainath

Goyal

et al. 2019

Philosophical Magazine

View full text Add to dashboard Cite

In recent years, twinned nanopillars have attracted tremendous attention for research due to their superior mechanical properties. However, most of the studies were focused on nanopillars with twin boundaries (TBs) perpendicular to loading direction. Nanopillars with TBs parallel to loading direction have received minimal interest. In this backdrop, the present study is aimed at understanding the role of axial TBs on strength and deformation behaviour of Cu nanopillars using atomistic simulations. Tensile and compression tests have been performed on <112> nanopillars with and without TBs. Twinned nanopillars with twin boundary spacing in the range 1.6-5 nm were considered. The results indicate that, under both tension and compression, yield strength increases with decreasing twin boundary spacing and is always higher than that of perfect nanopillars. Under compression, the deformation in <112> perfect as well as twinned nanopillars proceeds by the slip of extended dislocations. In twinned nanopillars, an extensive cross-slip by way of Friedel-Escaig and Fleischer mechanisms has been observed in compression. On the other hand, under tensile loading, the deformation in perfect nanopillars occurs by partial slip/twinning, while in twinned nanopillars, it proceeds by the slip of extended dislocations. This extended dislocation activity is facilitated by stair-rod formation and its dissociation on the twin boundary. Similar to compressive loading, the extended dislocations under tensile loading also exhibit cross-slip activity in twinned nanopillars. However, this cross-slip activity occurs only through Fleischer mechanism and no Friedel-Escaig mechanism of cross-slip has been observed under tensile loading.

show abstract

“…Metallic nanowires are promising building blocks for a host of applications such as transparent electrodes, sensors, flexible or stretchable electronics, etc. [1][2][3][4][5][6][7]. The operation and reliability of nanowires-based devices call for a robust mechanical performance and a thorough understanding of their deformation behaviors.…”

Section: Introductionmentioning

confidence: 99%

Graphene-coated tungsten nanowires deliver unprecedented modulus and strength

Wang

Guo

et al. 2018

Materials Research Letters

View full text Add to dashboard Cite

Tungsten (W) nanowires have a wide range of chemical, electronic, and mechanical applications. However, the modulus and strength of traditional W nanowires are quite low, and how to improve their mechanical performance remains a challenge. Here, we describe a novel graphene-coated W nanowires that demonstrate a Young's modulus of 885 GPa (twice that of W) and a fracture strength of up to 24.7 GPa (66% of the ideal strength). Both the Young's modulus and the fracture strength show a strong size effect, resulting from the graphene-nanowire core-shell structure. IMPACT STATEMENT We report a novel graphene-coated W nanowires that demonstrate unprecedented Young's modulus (885 GPa, twice that of W) and fracture strength (24.7 GPa, 66% of the ideal strength).

show abstract

Anomalous Tensile Detwinning in Twinned Nanowires

Cited by 53 publications

References 43 publications

Rebuilding the Strain Hardening at a Large Strain in Twinned Au Nanowires

Rebuilding the Strain Hardening at a Large Strain in Twinned Au Nanowires

Role of axial twin boundaries on deformation mechanisms in Cu nanopillars

Graphene-coated tungsten nanowires deliver unprecedented modulus and strength

Contact Info

Product

Resources

About