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

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-pa...

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Bibliographic Details
Main Authors Lin, Feng, Levitas, Valery, Pandey, Krishan, Yesudhas, Sorb, Park, Changyong
Format Journal Article
LanguageEnglish
Published 25.05.2023
Subjects
Physics - Materials Science
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Summary: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 {\alpha}-{\omega} phase transformation (PT) and depend solely on the volume fraction of {\omega}-Zr. Rough-DA produce a steady nanostructure in {\alpha}-Zr with lower crystallite size and larger dislocation density than smooth-DA, leading to a two-time reduction in a minimum pressure for {\alpha}-{\omega} PT to a record value 0.67 GPa. The kinetics of strain-induced PT unexpectedly depends on time.
DOI:10.48550/arxiv.2305.15737