INVESTIGADORES
AVALOS Martina Cecilia
artículos
Título:
Anisotropic and heterogeneous development of microstructures. Combining laboratory/synchrotron X-rays and EBSD on a few SPD metallic systems?
Autor/es:
R. BOLMARO; N. DE VINCENTIS; E. BENNATTI; A. KLIAUGA; M. AVALOS; H. BROKMEIER
Revista:
IOP Materials Science and Engineering
Editorial:
IOP Publishing
Referencias:
Lugar: Bristol; Año: 2014 vol. 63 p. 1 - 9
ISSN:
1757-899X
Resumen:
Abstract.
The
onset of Severe Plastic Deformation (SPD) regime is quite instructive on the
possible
origins of the nano-microstructures developed in metals and alloys. It is known
that grain fragmentation and dislocation accumulation, among other defects,
proceed at different paces depending fundamentally on grain orientations and
active deformation mechanisms.
There
have been many attempts to characterize nano-microstructure anisotropy, leading
all of them to sometimes contradictory conclusions. Moreover, the
characterizations rely on different measurements techniques and pos-processing
approaches, which can be observing different manifestations of the same
phenomena.
On
the current presentation we show a few experimental and computer pos-processing
and simulation approaches, applied to some SPD/alloy systems. Williamson-Hall
and Convolutional Multiple Whole Profile (CMWP) techniques will be applied to
peak broadening analysis on experimental results stemming from laboratory Cu K
X-rays, and synchrotron radiation from LNLS (Laboratório Nacional de Luz
Síncrotron, Campinas, Brazil) and Petra III line (HEMS station, at DESY,
Hamburg, Germany).
Taking
advantage of the EBSD capability of giving information on orientational and
topological characteristics of grain boundaries, microstructures, grain sizes,
etc., we also performed investigations on dislocation density and Geometrically
Necessary Dislocation Boundaries (GNDB) and their correlation with texture
components.
Orientation
dependent nano-microstructures and domain sizes are shown on the scheme of generalized
pole figures and discussions provide some hints on nano-microstructure
anisotropy.