Melting As An Extreme Deformation Mechanism
At High Strain Rates
Author(s)
L. E. Murr & C. Pizaña
Abstract
Deformation, especially plastic deformation involving shock and impact in
crystalline metal and alloy systems, begins as nonlinear dislocation phenomena
which in the extreme deformation regime involving high strains and high-strainrates
leads variously to shear phenomena involving twinning and microband
formation, dynamic recrystallization either as localized shear instabilities in
shear bands or large volume solid-state flow, and finally localized melting.
These mechanisms can be viewed as \“deformation state” changes within some
pressure-temperature regimes. In this work, we present examples of
deformation-induced melting, especially in association with dynamic
recrystallization (DRX). These examples include partial melting in explosive
weld-wave vortex structures in connection with DRX in several dissimilar metal
and alloy (explosive welded) systems, as well as projectile-target interactions for
W single crystal rods and W rods clad with Inconel 718 (53% Ni, 17% Fe, 20%
Cr) penetrating RHA steel targets at impact velocities ranging from 1.2 to 1.4
km/s.
Keywords: dynamic recrystallization, melting, projectile-target interactions,
shear bands, microstructures.
1 Introduction
There are numerous examples of melting in deformation or melting especially as
a consequence of extreme deformation. These include the so-called mach stem
zones along the central axis of cylindrical shock regimes [1,2], melting zones
Keywords
dynamic recrystallization, melting, projectile-target interactions,shear bands, microstructures.
Related Book
Other papers in this volume
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