Rules of plastic strain-induced phase transformations and nanostructure evolution under high-pressure and severe plastic flow

2023/05/25 by Lin Feng, Lin, Feng, Valery I. Levitas +6
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Force Microscopy Techniques and Applications #High-pressure geophysics and materials #Materials Science (cond-mat.mtrl-sci)

paper · pdf · doi:10.48550/arxiv.2305.15737

openalex publication_date 2023/05/25 · openalex created_date 2023/05/27 · openalex updated_date 2026/08/01

Abstract

Rough diamond anvils (rough-DA) are introduced to intensify all occurring processes during an in-situ study of heterogeneous compression of strongly pre-deformed Zr in diamond anvil cell (DAC). Crystallite size and dislocation density of Zr are getting pressure-, plastic strain tensor- and strain-path-independent during α-ω phase transformation (PT) and depend solely on the volume fraction of ω-Zr. Rough-DA produce a steady nanostructure in α-Zr with lower crystallite size and larger dislocation density than smooth-DA, leading to a two-time reduction in a minimum pressure for α-ω PT to a record value 0.67 GPa. The kinetics of strain-induced PT unexpectedly depends on time.

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