Title :

Femtosecond Visualization of hcp-Iron Strength and Plasticity under Shock Compression

Author(s) :

Merkel, Sébastien [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Hok, Sovanndara [Auteur]
Stanford EARTH
Bolme, Cynthia [Auteur]
Los Alamos National Laboratory [LANL]
Rittman, Dylan [Auteur]
Stanford EARTH
Ramos, Kyle James [Auteur]
Morrow, Benjamin [Auteur]
Los Alamos National Laboratory [LANL]
Lee, Hae Ja [Auteur]
Nagler, Bob [Auteur]
Galtier, Eric [Auteur]
Granados, Eduardo [Auteur]
Hashim, Akel [Auteur]
Stanford Synchrotron Radiation Lightsource [SSRL SLAC]
Mao, Wendy L [Auteur]
Stanford EARTH
Gleason, Arianna E [Auteur]
Stanford EARTH
Hok, Sovanndara [Auteur]

Journal title :

Physical Review Letters

Abbreviated title :

Phys. Rev. Lett.

Volume number :

127

Pages :

205501

Publisher :

American Physical Society (APS)

Publication date :

2021-11-09

ISSN :

0031-9007

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre

English abstract : [en]

Iron is a key constituent of planets and an important technological material. Here, we combine in situ ultrafast x-ray diffraction with laser-induced shock compression experiments on Fe up to 187(10) GPa and 4070(285) K ...
Show more >Iron is a key constituent of planets and an important technological material. Here, we combine in situ ultrafast x-ray diffraction with laser-induced shock compression experiments on Fe up to 187(10) GPa and 4070(285) K at 10^8  s−1 in strain rate to study the plasticity of hexagonal-close-packed (hcp)-Fe under extreme loading states. {10-12} deformation twinning controls the polycrystalline Fe microstructures and occurs within 1 ns, highlighting the fundamental role of twinning in hcp polycrystals deformation at high strain rates. The measured deviatoric stress initially increases to a significant elastic overshoot before the onset of flow, attributed to a slower defect nucleation and mobility. The initial yield strength of materials deformed at high strain rates is thus several times larger than their longer-term flow strength. These observations illustrate how time-resolved ultrafast studies can reveal distinctive plastic behavior in materials under extreme environments.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

ANR Project :

ULNE

Other project(s) or funding source(s) :

I-SITE ULNE R-ERCGEN-19-006-MERKEL MetalCore

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2021-11-10T08:59:57Z
2021-11-15T10:26:30Z