TY - JOUR
T1 - Development of micro-beam NRA for hydrogen mapping
T2 - Observation of fatigue-fractured surface of glassy alloys
AU - Sekiba, D.
AU - Yonemura, H.
AU - Ogura, S.
AU - Matsumoto, M.
AU - Kitaoka, Y.
AU - Yokoyama, Yoshihiko
AU - Matsuzaki, H.
AU - Narusawa, T.
AU - Fukutani, K.
PY - 2011/4/1
Y1 - 2011/4/1
N2 - A micro-beam NRA system by means of a resonant nuclear reaction of 1H(15N, αγ)12C has been developed at the beam line in MALT, University of Tokyo. The beam optics was analyzed in terms of the phase diagram. By carefully suppressing the spherical aberration of the final quadrupole magnetic lens, the 15N beam at the energy of 6.4 MeV was focused on targets with a size of 17 μm × 30 μm. For the precise positioning of the sample and beam spot, a combination of the mirror and optical microscope was adopted, so that the hydrogen concentration can be measured at a desirable position of the sample. With this new system, the hydrogen concentrations of fatigue-fractured surfaces of glassy alloys were determined from the viewpoint of the hydrogen embrittlement: Zr 50Cu37Al10Pd3 and Zr 50Cu40Al10. Depth-resolved two-dimensional (2D) mapping of hydrogen concentration was performed in the area of 3 mm × 3 mm with an in-plane resolution of 150 μm. The maps taken at three different depths revealed that the hydrogen concentration is higher in the fatigue-fractured regions in both samples.
AB - A micro-beam NRA system by means of a resonant nuclear reaction of 1H(15N, αγ)12C has been developed at the beam line in MALT, University of Tokyo. The beam optics was analyzed in terms of the phase diagram. By carefully suppressing the spherical aberration of the final quadrupole magnetic lens, the 15N beam at the energy of 6.4 MeV was focused on targets with a size of 17 μm × 30 μm. For the precise positioning of the sample and beam spot, a combination of the mirror and optical microscope was adopted, so that the hydrogen concentration can be measured at a desirable position of the sample. With this new system, the hydrogen concentrations of fatigue-fractured surfaces of glassy alloys were determined from the viewpoint of the hydrogen embrittlement: Zr 50Cu37Al10Pd3 and Zr 50Cu40Al10. Depth-resolved two-dimensional (2D) mapping of hydrogen concentration was performed in the area of 3 mm × 3 mm with an in-plane resolution of 150 μm. The maps taken at three different depths revealed that the hydrogen concentration is higher in the fatigue-fractured regions in both samples.
KW - Heavy ion
KW - Hydrogen detection
KW - Micro-beam
KW - NRA
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U2 - 10.1016/j.nimb.2010.12.079
DO - 10.1016/j.nimb.2010.12.079
M3 - Article
AN - SCOPUS:79952442057
VL - 269
SP - 627
EP - 631
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
IS - 7
ER -