In situ atomic-scale observation of AuCu alloy nanowire with superplasticity and high strength at room temperature

Fu, Lin; Yang, Chengpeng; Wei, Rujian; Pei, Xuhui; Teng, Jun; Kong, Deli; Lü, Yan; Guo, Yizhong; Liu, Tingting; Hu, Yayun; Yin, Binglun; Zhang, Z.; Li, A.; Wang, L.; Han, Xiao

doi:10.1016/j.mtnano.2021.100123

Cited by 7 publications

(7 citation statements)

References 84 publications

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“…S3, it is found that there is an extra half-plane on {111} planes. This configuration represents a typical full dislocation with a Burgers vector of b = 1 2 < 011 >, which was frequently observed in previous studies [33][34][35]. With increasing strain, as shown in Fig.…”

Section: Resultssupporting

confidence: 73%

“…In this study, the deformation behavior of an NC AuAg alloy with an average grain size of~15 nm was investigated in situ at the atomic scale using a custom-built device [32,33]. The results show that there are three types of detwinning mechanisms: GB migration-induced detwinning, combined layer-by-layer thinning and ITB migration, and ITB migration.…”

Section: Introductionmentioning

confidence: 99%

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In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy

Yang

Lü

et al. 2021

Sci. China Mater.

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Detwinning is an important plastic deformation mechanism that can significantly affect the mechanical properties of twin-structured metals. Although many detwinning mechanisms have been proposed for pure metals, it is unclear whether such a deformation model is valid for nanocrystalline alloys because of the lack of direct evidence. Here, the atomicscale detwinning deformation process of a nanocrystalline AuAg alloy with an average grain size of~15 nm was investigated in situ. The results show that there are three types of detwinning mechanisms in nanocrystalline AuAg alloys. The first type of detwinning results from grain boundary migration. The second type of detwinning occurs through combined layer-by-layer thinning and incoherent twin boundary migration. The last one occurs through incoherent twin boundary migration, which results from the collective motion of partial dislocations in an array.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy

Yang

Lü

et al. 2021

Sci. China Mater.

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“…This indicates that there was no obvious strain hardening for the twin-structured Ni and Cu nanocrystals. According to previous experimental and simulation results [8][9][10][11][12]45,46], the mechanical properties of materials were directly related to their deformation mechanisms, so these differing stress-strain curves indicate that the deformation mechanisms of these twin-structured metals should be different, as discussed below. Figure 3 shows the structural evolution process of the Au nanocrystal with ITB during tensile loading.…”

Section: Resultsmentioning

confidence: 83%

Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary

Tao

Zhao

Wang

et al. 2021

Metals

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Incoherent twin boundaries (ITBs) can significantly affect the mechanical properties of twin-structured metals. However, most previous studies have focused on the deformation mechanism of the coherent twin boundary (CTB), and metals with ITB-accommodated plasticity still require further investigation. In this study, deformation mechanisms of FCC-structured nanocrystal metals with ITBs were investigated using molecular dynamic (MD) simulations. We revealed that three deformation mechanisms occur in metals with ITBs. The first type of deformation was observed in Au, where the plasticity is governed by partial dislocation intersections with CTBs or reactions with each other to form Lomer–Cottrell (L–C) locks. In the second type, found in Al, the deformation is governed by reversible ITB migration. The third type of deformation, in Ni and Cu, is governed by partial dislocations emitted from the ITB or the tips of the stacking faults (SFs). The observed L–C lock formation, as well as the reversible ITB migration and partial dislocation emission from the tips of SFs, have rarely been reported before.

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“…The BP prediction and experiments compared in Figures 12-14 at different strain rates and temperatures show than the BP network was very high in accuracy compared to the four conventional model. To comprehensively evaluate the four conventional models of JC, ZA, MKH, and MLH and the BP network regarding their prediction accuracy of the flow curves at different strain rates and temperatures, the R 2 (coefficient of determination) and the average absolute relative error were are calculated by the 21 experimental curves in Figures 4 and 5 using Equation (7). It should be noted that all the experimental data were used to compute R 2 and error for the four conventional models and the BP model.…”

Section: Evaluation Of Four Conventional Models and The Bp Networkmentioning

confidence: 99%

“…At the same time, the loading condition has a significant effect on the mechanical response of materials. Plastic deformation mechanisms have been extensively studied for metals and metallic-based composites [ 5 , 6 , 7 ]. Mechanical experiments and numerical characterization are the key methods to investigate the deformation process of SiC/Al composites.…”

Section: Introductionmentioning

confidence: 99%

Precise Modeling of Thermal and Strain Rate Effect on the Hardening Behavior of SiC/Al Composite

Wang

et al. 2022

Materials

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Temperature and strain rate have significant effects on the mechanical behavior of SiC/Al 2009 composites. This research aimed to precisely model the thermal and strain rate effect on the strain hardening behavior of SiC/Al composite using the artificial neural network (ANN). The mechanical behavior of SiC/Al 2009 composites in the temperature range of 298–623 K under the strain rate of 0.001–0.1 s−1 was investigated by a uniaxial tension experiment. Four conventional models were adopted to characterize the plastic flow behavior in relation to temperature, strain rate, and strain. The ANN model was also applied to characterize the flow behavior of the composite at different strain rates and temperatures. Experimental results showed that the plastic deformation behavior of SiC/Al 2009 composite possesses a coupling effect of strain, strain rate, and temperature. Comparing the prediction error of these models, all four conventional models could not provide satisfactory modeling of flow curves at different strain rates and temperatures. Compared to the four conventional models, the suggested ANN structure dramatically improved the prediction accuracy of the flow curves at different strain rates and temperatures by reducing the prediction error to a maximum of 4.0%. Therefore, the ANN model is recommended for precise modeling of the thermal and strain rate effect on the flow curves of SiC/Al composites.

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In situ atomic-scale observation of AuCu alloy nanowire with superplasticity and high strength at room temperature

Cited by 7 publications

References 84 publications

In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy

In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy

Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary

Precise Modeling of Thermal and Strain Rate Effect on the Hardening Behavior of SiC/Al Composite

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