Morphology and growth speed of hcp domains during shock-induced phase transition in iron

Pang, Weiwei; Zhang, Ping; Zhang, Guangcai; Xu, Aiguo; Zhao, Xian-Geng

doi:10.1038/srep03628

Cited by 19 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And Significant progress has been made in studies of the shock structural transition and related mechanism. Such as single crystal 20 , 21 and polycrystal 22 , uniaxial 23 – 25 and uniform 26 compressions, homogeneous 26 , 27 and heterogeneous 28 , 29 nucleations, plasticity and phase transition 30 – 32 .…”

Section: Introductionmentioning

confidence: 99%

Hcp/fcc nucleation in bcc iron under different anisotropic compressions at high strain rate: Molecular dynamics study

Shao

Wang

Zhang

et al. 2018

Sci Rep

View full text Add to dashboard Cite

Previous researches have revealed the importance of shear and the orientation dependence in the structural transition of iron. In this work, we introduce a series of shear deformations by adjusting the strain ratio between the longitudinal ([001]) and transversal ([010] and [100]) directions, and then investigate this structural transition under different anisotropic compressions with molecular dynamics simulations. It is found that the shear deformation can lower the transition pressure notably, and even change the nucleation structure and morphology. Under 1D-dominated compression (along (001) direction), there only appears hcp nucleation with a few fcc stacking faults. For other cases, more equivalent planes will be activated and fcc structure begins to nucleate. Under 2D-dominated compression (along (010) and (001) directions), the fcc mass fraction is already over the hcp phase. At last, we compare the variations of shear stress and potential energy for different phases, and present the sliding mechanism under typical anisotropic compressions.

show abstract

Section: Introductionmentioning

confidence: 99%

Hcp/fcc nucleation in bcc iron under different anisotropic compressions at high strain rate: Molecular dynamics study

Shao

Wang

Zhang

et al. 2018

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Here, the energy barrier of nucleation of the phase transition means the amount of strain energy with which the max fluctuation of lattice atoms could stimulate the collective reconstruction motions. Movement of phase boundaries of this mechanism is believed to be driven by the interphase energy or an energy difference existed between deformed BCC phase and HCP phase (Pang et al, 2014a). It is this reason that cause the sudden jump observed in Fig.…”

Section: Phase Transition Mechanisms and Their Coupling With Precedinmentioning

confidence: 92%

Coupling between plasticity and phase transition of polycrystalline iron under shock compressions

Wang

Zhu

Xiao

et al. 2015

International Journal of Plasticity

View full text Add to dashboard Cite

“…Interestingly, the hcp phases nucleate both at the upper and lower (111) bcc surfaces at a high shear angle around 23 • , as shown in Figure 8e. Besides fcc/bcc phase transition, there exists another allotropic bcc/hcp transition in element Fe, which is induced by the stress [44,45]. The hcp nuclei cover the whole upper and lower free surfaces.…”

Section: Fcc Film 2 With the (110) Free Surfacementioning

confidence: 99%

Shear Deformation Helps Phase Transition in Pure Iron Thin Films with “Inactive” Surfaces: A Molecular Dynamics Study

Ruan

Wang

et al. 2020

Crystals

View full text Add to dashboard Cite

In a previous study, it was shown that the (111)fcc, (110)fcc and (111)bcc free surfaces do not assist the phase transitions as nucleation sites upon heating/cooling in iron (Fe) thin slabs. In the present work, the three surfaces are denoted as “inactive” free surfaces. The phase transitions in Fe thin films with these “inactive” free surfaces have been studied using a classical molecular dynamics simulation and the Meyer–Entel potential. Our results show that shear deformation helps to activate the free surface as nucleation sites. The transition mechanisms are different in dependence on the surface orientation. In film with the (111)fcc free surface, two body-centered cubic (bcc) phases with different crystalline orientations nucleate at the free surface. In film with the (110)fcc surface, the nucleation sites are the intersections between the surfaces and stacking faults. In film with the (111)bcc surface, both heterogeneous nucleation at the free surface and homogeneous nucleation in the bulk material are observed. In addition, the transition pathways are analyzed. In all cases studied, the unstrained system is stable and no phase transition takes place. This work may be helpful to understand the mechanism of phase transition in nanoscale systems under external deformation.

show abstract

Morphology and growth speed of hcp domains during shock-induced phase transition in iron

Cited by 19 publications

References 17 publications

Hcp/fcc nucleation in bcc iron under different anisotropic compressions at high strain rate: Molecular dynamics study

Hcp/fcc nucleation in bcc iron under different anisotropic compressions at high strain rate: Molecular dynamics study

Coupling between plasticity and phase transition of polycrystalline iron under shock compressions

Shear Deformation Helps Phase Transition in Pure Iron Thin Films with “Inactive” Surfaces: A Molecular Dynamics Study

Contact Info

Product

Resources

About