INVESTIGADORES
BOLMARO Raul Eduardo
artículos
Título:
Texture analysis with a time-of-flight neutron strain scanner
Autor/es:
FLORENCIA MALAMUD; JAVIER R. SANTISTEBAN; MIGUEL ANGEL VICENTE ALVAREZ; BOLMARO, RAÚL E.; J. KELLEHER; S. KABRA; W. KOCKELMANN
Revista:
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2014 vol. 47 p. 1337 - 1354
ISSN:
0021-8898
Resumen:
A time-of-flight (TOF) neutron strain scanner is a white-beam instrument
optimized to measure diffractograms at precise locations within bulky
specimens, typically along two perpendicular sample orientations. Here, a
method is proposed that exploits the spatial resolution (1 mm) provided by
such an instrument to determine in a nondestructive manner the crystallographic
texture at selected locations within a macroscopic object. The method
is based on defining the orientation distribution function (ODF) of the
crystallites from several incomplete pole figures, and it has been implemented on
ENGIN-X, a neutron strain scanner at the ISIS facility in the UK. This method
has been applied to determine the texture at different locations of Al alloy
plates welded along the rolling direction and to study a Zr2.5%Nb pressure tube
produced for a CANDU nuclear power plant. For benchmarking, the results
obtained with this instrument for samples of ferritic steel, copper, Al alloys and
Zr alloys have been compared with measurements performed using conventional
X-ray diffractometers and more established neutron techniques. For cases
where pole figure coverage is incomplete, the use of TOF neutron transmission
measurements simultaneously performed on the specimens is proposed as a
simple and powerful test to validate the resulting ODF.