Mechanical behaviors of irradiated FCC polycrystals with nanotwins

Xiao, Xiazi; Song, Dingkun; Chu, Hongling; Xue, Jianming; Duan, Huiling

doi:10.1016/j.ijplas.2015.06.008

Cited by 25 publications

(5 citation statements)

References 73 publications

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“…Besides those studies on the formation mechanisms of SFT, many recent research interests now focus on the interaction of SFT with other structural defects, mainly dislocations [31][32][33][34][35][36][37][38] and twin boundary [39][40][41]. For example, previous MD studies revealed that SFT can provide a strong obstacle for glide dislocations that ultimately increase the yield strength and decrease ductility [42,43].…”

Section: Introductionmentioning

confidence: 99%

Stacking fault tetrahedron induced plasticity in copper single crystal

Zhang

Lü

Tieu

et al. 2017

Materials Science and Engineering: A

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Stacking fault tetrahedron (SFT) is the most common type of vacancy clustered defects in fcc metals and alloys, and can play an important role in the mechanical properties of metallic materials. In this study, molecular dynamics (MD) simulations were carried out to investigate the incipience of plasticity and the underlying atomic mechanisms in copper single crystals with SFT. Different deformation mechanisms of SFT were reported due to the crystal orientations and loading directions (compression and tension). The results showed that the incipient plasticity in crystals with SFT resulted from the heterogeneous dislocation nucleation from SFT, so the stress required for plastic deformation was less than that needed for perfect single crystals. Three crystal orientations ([1 0 0], [1 1 0] and [1 1 1]) were specified in this study because they can represent most of the typical deformation mechanisms of SFT. MD simulations revealed that the structural transformation of SFT was frequent under the applied loading; a metastable SFT structure and the collapse of SFT were usually observed. The structural transformation resulted in a different reduction of yield stress in compression and tension, and also caused a decreased or reversed compression/tension asymmetry. Compressive stress can result in the unfaulting of Frank loop in some crystal orientations. According to the elastic theory of dislocation, the process of unfaulting was closely related to the size of the dislocation loop and the stacking fault energy.

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Section: Introductionmentioning

confidence: 99%

Stacking fault tetrahedron induced plasticity in copper single crystal

Zhang

Lü

Tieu

et al. 2017

Materials Science and Engineering: A

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“…Crystal plasticity models have been developed to describe the mechanical behaviors of irradiated face-centered cubic (FCC) metals with and without NT structures. 101,102 Also, many theoretical models have been proposed to improve the fundamental understanding of the deformation mechanisms of NT metals, [103][104][105][106][107][108][109][110][111] some of which will be introduced in this review. In addition to the superior mechanical properties, it has also been reported that NT structures alter the electronic and optical properties of semiconductor nanowires.…”

Section: Introductionmentioning

confidence: 99%

Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts

Sun

2018

npj Comput Mater

122

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The recent studies on nanotwinned (NT) and hierarchical nanotwinned (HNT) face-centered cubic (FCC) metals are presented in this review. The HNT structures have been supposed as a kind of novel structure to bring about higher strength/ductility than NT counterparts in crystalline materials. We primarily focus on the recent developments of the experimental, atomistic and theoretical studies on the NT and HNT structures in the metallic materials. Some advanced bottom-up and top-down techniques for the fabrication of NT and HNT structures are introduced. The deformation induced HNT structures are available by virtue of severe plastic deformation (SPD) based techniques while the synthesis of growth HNT structures is so far almost unavailable. In addition, some representative molecular dynamics (MD) studies on the NT and HNT FCC metals unveil that the nanoscale effects such as twin spacing, grain size and plastic anisotropy greatly alter the performance of NT and HNT metals. The HNT structures may initiate unique phenomena in comparison with the NT ones. Furthermore, based on the phenomena and mechanisms revealed by experimental and MD simulation observations, a series of theoretical models have been proposed. They are effective to describe the mechanical behaviors of NT and HNT metals within the applicable scope. So far the development of manufacturing technologies of HNT structures, as well as the studies on the effects of HNT structures on the properties of metals are still in its infancy. Further exploration is required to promote the design of advanced materials.

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“…It is a common and effective method to improve the radiation resistance of materials by introducing various types of defect sinks to absorb the defects produced by irradiation and thus reduce the defect concentration [3,4]. Dislocation networks [5,6], grain boundaries [7], twin boundaries [8,9], phase boundaries [10], free surfaces [11], small precipitates [12] and voids [13] can be used as defect sinks. Oxide dispersion strengthened (ODS) steels are typical radiation-damageresistant materials designed with a large number of grain boundaries, phase boundaries and precipitates, and have excellent high temperature creep resistance and chemical stability [14].…”

Section: Introductionmentioning

confidence: 99%

Design and Preparation of Nanoporous Cu/Ag Multilayer Films

Wang

Zhang

et al. 2021

Coatings

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Cu30Al70 and Ag30Al70 multilayer precursor films were prepared by magnetron sputtering, respectively. Then the nanoporous Cu/Ag multilayer composite films were successfully prepared by selecting the appropriate H2SO4 solution as the dealloying solution. It was found that the nanoporous structure was stable in the dealloying solution. The morphology and structure of nanoporous films are mainly related to the phase composition of precursors. The structure of nanoporous multilayers can be simply regarded as the superposition of single-layer structures. Our work shows that nanoporous multilayers can be well-prepared by magnetron sputtering combined with dealloying.

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Mechanical behaviors of irradiated FCC polycrystals with nanotwins

Cited by 25 publications

References 73 publications

Stacking fault tetrahedron induced plasticity in copper single crystal

Stacking fault tetrahedron induced plasticity in copper single crystal

Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts

Design and Preparation of Nanoporous Cu/Ag Multilayer Films

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