Experimental investigation of the dynamic phase transitions in tin

by Mr. Eli Gudinetsky

Bgu

at Condensed Matter Seminar

Mon, 08 Jun 2020, 11:30
Sacta-Rashi Building for Physics (54), room 207

Abstract

This seminar will be on Zoom *only* please see the details below.

In this work, tin (Sn) samples of varying thicknesses and initial temperatures were subjected to high pressures and high temperatures by shock loading. The polymorphic (solid-solid) phase transition from -Sn to -Sn and the rate of transformation (kinetics) were studied. Additionally, the shear stress associated with the elastic-plastic transition and the fracture stress (spall) were also studied. The variation of shear, fracture and phase transition stresses and their kinetics, with initial sample temperature and propagation distance inside the sample were obtained.
The spall stress was found to steadily decrease with initial sample temperature from about at room temperature to a few below melting. It was found that the rate of decay of the shear stress with propagation distance is by 1 to 2 orders of magnitude lower than the rate initial transformation of , which is in turn 1 to 2 orders of magnitude lower than the maximum transformation rate. The dynamic phase boundary in the pressure-temperature domain was found to lay slightly above the static boundary reported in the literature.

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Topic: Eli Gudinetsky
Time: Jun 8, 2020 11:30 AM Jerusalem

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Created on 01-06-2020 by Meidan, Dganit (dganit)
Updaded on 01-06-2020 by Meidan, Dganit (dganit)