# In situ quantitative study of plastic strain-induced phase transformations under high pressure: Example for ultra-pure Zr

Source: [In situ quantitative study of plastic strain-induced phase transformations under high pressure: Example for ultra-pure Zr](<https://www.sota2.com/research/paper/68fa3b7f1e209131ce8d32e2>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T00:37:52.438Z

Authors: K. K. Pandey, Valery I. Levitas

Published: 2019-12-06T17:57:56.000Z

## Abstract

The first in situ quantitative synchrotron X-ray diffraction (XRD) study of plastic strain-induced phase transformation (PT) has been performed on $\\alpha-\\omega$ PT in ultra-pure, strongly plastically predeformed Zr as an example, under different compression-shear pathways in rotational diamond anvil cell (RDAC). Radial distributions of pressure in each phase and in the mixture, and concentration of $\\omega$-Zr, all averaged over the sample thickness, as well as thickness profile were measured. The minimum pressure for the strain-induced $\\alpha-\\omega$ PT, $p^d\_{\\varepsilon}$=1.2 GPa, is smaller than under hydrostatic loading by a factor of 4.5 and smaller than the phase equilibrium pressure by a factor of 3; it is independent of the compression-shear straining path. The theoretically predicted plastic strain-controlled kinetic equation was verified and quantified; it is independent of the pressure-plastic strain loading path and plastic deformation at pressures below $p^d\_{\\varepsilon}$. Thus, strain-induced PTs under compression in DAC and torsion in RDAC do not fundamentally differ. The yield strength of both phases is estimated using hardness and x-ray peak broadening; the yield strength in shear is not reached by the contact friction stress and cannot be evaluated using the pressure gradient. Obtained results open a new opportunity for quantitative study of strain-induced PTs and reactions with applications to material synthesis and processing, mechanochemistry, and geophysics.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1912.03259>)

[PDF](<https://arxiv.org/pdf/1912.03259.pdf>)