Triaxial tension-induced damage behavior of nanocrystalline NiTi alloy and its dependence on grain size

Wang, Fang; Liu, He; Zeng, Xiangguo; Qi, Zhongpeng; Song, Bo; Yang, Xin

doi:10.1016/j.jmst.2020.10.041

Cited by 24 publications

(3 citation statements)

References 46 publications

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“…The grain boundary deformation is the leading deformation mechanism in nanocrystalline (polycrystal having a grain size less than 100 nm) metals. Therefore, it is evident in many studies that initial void formation is observed at the grain boundary [25][26][27][28]. The partial dislocation emission advances the growth of emitted void toward the inside of the grains.…”

Section: Introductionmentioning

confidence: 99%

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Effect of void in deformation and damage mechanism of single crystal copper: a molecular dynamics study

Rajput¹,

Paul²

2021

Modelling Simul. Mater. Sci. Eng.

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The current study investigates the deformation and damage mechanism of single crystal copper in the presence of a void located at the copper cell center. Tensile and compressive deformations are conducted in two loading modes, uniaxial and triaxial. Alteration in mechanical properties is observed due to the presence of void in different deformation modes. In uniaxial deformation, a smooth gradient in stress and strain distribution are evident before dislocation nucleation, i.e. in the elastic domain. However, inhomogeneity in stress and strain distribution are noted during the plastic deformation, i.e. after dislocations emission. Stress concentration remains high near the void surface ahead of the dislocation emission. Stress and strain concentration play a substantials role in nucleating defects (i.e. dislocation and stacking fault) from the void surface. Moreover, the void growth in tension and void shrinking in compression are found due to the emission/shrink of dislocations from the void surface. Consequently, an effective rate of dislocation emission enhances the growth rate of the void, as it happens in triaxial tensile deformation.

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Section: Introductionmentioning

confidence: 99%

“…If the grains size is large, then intergranular fracture dominates. Conversely, if the grain size is smaller, transgranular and intergranular fracture modes act simultaneously [25][26][27][28]. An interesting observation is that void density and void growth rate work together during the temperature range of 300 K-1200 K [29].…”

Section: Introductionmentioning

confidence: 99%

Effect of void in deformation and damage mechanism of single crystal copper: a molecular dynamics study

Rajput¹,

Paul²

2021

Modelling Simul. Mater. Sci. Eng.

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show abstract

“…The final damage state can be classified into various types based on the extent of void coalescence, encompassing isolated voids, clustered microvoids, and complete spalls. 28 Wang 29 found that enlargement in grain size results in a higher proportion of voids growing along grain boundaries, accompanied by a notable decrease in voids expanding toward the interior of the grains. As the competition between nanograin-nucleation weakening and grain-boundary strengthening becomes increasingly evident, a key question arises: how does size affect the nanocrystalline fracture dynamics, specifically the characteristics of void evolution?…”

mentioning

confidence: 99%

Synergy of Spall Strength and Toughness in Nanograined Metals

Zhu,

Qian,

Qiu

et al. 2024

Nano Lett.

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Under shock loading, the spall strength of nanocrystals exhibits intricate grain-size effects due to the presence of abundant grain boundary and dislocation activities. However, the influence of size on spall toughness and void evolution has been largely overlooked. This study employs molecular dynamics simulations to investigate the damage accumulation characteristics of nanocrystalline aluminum across various grain sizes. Unlike the trade-off observed in quasistatic loading conditions, our study reveals a consistency in which grain size governs both nanovoid nucleation and coalescence, yielding a novel spall strength− toughness synergy. These insights highlight grain sizes that are particularly susceptible to spall fracture, offering a crucial understanding of nanocrystal failure mechanisms in extreme environments.

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Coupling Between Ductile Damage Evolution and Phase Transition in Single Crystal Niobium Subjected to High Strain Rate Loading

Wang

Zeng

et al. 2022

J. of Materi Eng and Perform

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Triaxial tension-induced damage behavior of nanocrystalline NiTi alloy and its dependence on grain size

Cited by 24 publications

References 46 publications

Effect of void in deformation and damage mechanism of single crystal copper: a molecular dynamics study

Effect of void in deformation and damage mechanism of single crystal copper: a molecular dynamics study

Synergy of Spall Strength and Toughness in Nanograined Metals

Coupling Between Ductile Damage Evolution and Phase Transition in Single Crystal Niobium Subjected to High Strain Rate Loading

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