Collective nature of plasticity in mediating phase transformation under shock compression
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PhysRevB.89.220101.pdf
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Author(s)
Zong, Hongxiang
Ding, Xiangdong
Lookman, Turab
Li, Ju
Cerreta, Ellen K.
Escobedo, J. P.
Addessio, Francis L.
Bronkhorst, Curt A.
Sun, Jun, 1975-
Date Issued
June 2014
Journal
Physical Review B
Publisher
American Physical Society
Citation
Zong, Hongxiang, Xiangdong Ding, Turab Lookman, Ju Li, Jun Sun, Ellen K. Cerreta, J. P. Escobedo, Francis L. Addessio, and Curt A. Bronkhorst. “Collective Nature of Plasticity in Mediating Phase Transformation Under Shock Compression.” Phys. Rev. B 89, no. 22 (June 2014). © 2014 American Physical Society
Version
Final published version
Abstract
An open question in the behavior of metals subjected to shock is the nature of the deformation that couples to the phase transformation process. Experiments to date cannot discriminate between the role of known deformation processes such as twinning or dislocations accompanying a phase change, and modes that can become active only in extreme environments. We show that a deformation mode not present in static conditions plays a dominant role in mediating plastic behavior in hcp metals and determines the course of the transformation. Our molecular dynamics simulations for titanium demonstrate that the transformation is preceded by a 90° lattice reorientation of the parent, and the growth of the reoriented domains is accompanied by the collective action of dislocations and deformation twins. We suggest how diffraction and transmission electron microscopy experiments may validate our findings.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.89.220101
