Unraveling the plasticity performance and melting in single crystal tantalum damaged by shock compression

Jin, Weijun; Wang, Fang; Zeng, Xiangguo; Qi, Zhongpeng; Yang, Xin; Xie, Guiqiu; Xu, Zunping

doi:10.1016/j.engfracmech.2022.108921

Cited by 7 publications

(1 citation statement)

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“…Carrying out MD simulations, Li et al 50 successfully detected BCC-to-FCC phase transition in Ta single crystals subjected to high tensile strain rates. It has been well established that in single crystalline metals, solid–solid phase transition occurs through breaking atomic bonds by the shear stress components of the applied tensile stress 38 , 85 . Despite these efforts, there is a gap in the open literature regarding the phase transition in polycrystalline structures at high strain rate loading conditions.…”

Section: Resultsmentioning

confidence: 99%

Strain-rate-dependent plasticity of Ta-Cu nanocomposites for therapeutic implants

Kardani,

Montazeri,

Urbassek

2023

Sci Rep

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Recently, Ta/Cu nanocomposites have been widely used in therapeutic medical devices due to their excellent bioactivity and biocompatibility, antimicrobial property, and outstanding corrosion and wear resistance. Since mechanical yielding and any other deformation in the patient's body during treatment are unacceptable in medicine, the characterization of the mechanical behavior of these nanomaterials is of great importance. We focus on the microstructural evolution of Ta/Cu nanocomposite samples under uniaxial tensile loading conditions at different strain rates using a series of molecular dynamics simulations and compare to the reference case of pure Ta. The results show that the increase in dislocation density at lower strain rates leads to the significant weakening of the mechanical properties. The strain rate-dependent plastic deformation mechanism of the samples can be divided into three main categories: phase transitions at the extreme strain rates, dislocation slip/twinning at lower strain rates for coarse-grained samples, and grain-boundary based activities for the finer-grained samples. Finally, we demonstrate that the load transfer from the Ta matrix to the Cu nanoparticles via the interfacial region can significantly affect the plastic deformation of the matrix in all nanocomposite samples. These results will prove useful for the design of therapeutic implants based on Ta/Cu nanocomposites.

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Section: Resultsmentioning

confidence: 99%