Microstructural Effects in Face-Centered-Cubic Alloys after Small Charge Explosions |
| |
Authors: | D Firrao P Matteis G Scavino G Ubertalli C Pozzi MG Ienco P Piccardo MR Pinasco G Costanza R Montanari ME Tata G Brandimarte S Petralia |
| |
Affiliation: | (1) Materials Science and Chemical Engineering Department, Turin Technical University, 10129 Torino, Italy;(2) Chemical and Industrial Chemistry Department, Genova University, 16146 Genova, Italy;(3) Mechanical Engineering Department, Rome “Tor Vergata” University, 00133 Roma, Italy;(4) Explosives Chemistry Institute, Italian Military Navy, 19138 La Spezia, Mariperman, Italy;(5) Explosives Technology Laboratory, Italian Military Navy, 19138 La Spezia, Mariperman, Italy |
| |
Abstract: | Effects on metal targets after an explosion include the following: fracture, plastic deformation, surface modifications, and
microstructural crystallographic alterations with ensuing mechanical properties changes. In the case of small charge explosions,
macroscopic effects are restricted to small charge-to-target distances, whereas crystal alterations can still be observed
at moderate distances. Microstructural variations, induced on gold-alloy disk samples, as compared to previous results on
AISI 304Cu steel samples, are illustrated. The samples were subjected to blast-wave overpressures in the range of 0.5 to 195 MPa.
Minimum distances and peak pressures, which could still yield observable alterations, were especially investigated. Blast-related
microstructural features were observed on the explosion-exposed surface and on perpendicular cross sections. Analyses using
X-ray diffraction (XRD) were performed to identify modifications of phase, texture, dislocation density, and frequency of
mechanical twins, before and after the explosions. Optical metallography (OM) and scanning electron microscopy (SEM) observations
evidenced partial surface melting, zones with recrystallization phenomena, and crystal plastic deformation marks. The latter
marks are attributed to mechanical twinning in the stainless steel and to cross-slip (prevalent) and mechanical twinning (possibly)
in the gold alloy.
This article is based on a presentation given in the symposium “Dynamic Behavior of Materials,” which occurred February 26–March
1, 2007, during the TMS Annual Meeting in Orlando, FL, under the auspices of the TMS Structural Materials Division and the
TMS/ASM Mechanical Behavior of Materials Committee.
|
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|