INVESTIGADORES
BRINGA Eduardo Marcial
artículos
Título:
Ultrahigh Strength in Nanocrystalline Materials Under Shock Loading
Autor/es:
E.M. BRINGA; A. CARO; Y.M. WANG; M. VICTORIA; J.M. MCNANEY; B.A. REMINGTON
Revista:
SCIENCE
Editorial:
AMER ASSOC ADVANCEMENT SCIENCE
Referencias:
Año: 2005 vol. 39 p. 1838 - 1841
ISSN:
0036-8075
Resumen:
Molecular dynamics simulations of nanocrystalline copper under shock
loading show an unexpected ultrahigh strength behind
the shock front, with values up to twice those
at low pressure. Partial and perfect dislocations, twinning, and debris
from
dislocation interactions are found behind the
shock front. Results are interpreted in terms of the pressure dependence
of
both deformation mechanisms active at these
grain sizes, namely dislocation-based plasticity and grain boundary
sliding. These
simulations, together with new shock experiments
on nanocrystalline nickel, raise the possibility of achieving ultrahard
materials
during and after shock loading.