TY - JOUR
T1 - Mechanical relaxation due to hydrogen-solute complexes in dilute Ni-Ti-H alloys
AU - Numakura, H.
AU - Okamoto, N.
AU - Moriya, K.
AU - Koiwa, M.
N1 - Funding Information:
Acknowledgements--The authors are indebted to Dr T. Takasugi, IMR, Tohoku University, for preparing the single crystals, and to Dr O. Yoshinari and Professor K. Tanaka, Nagoya Institute of Technology, for their help in gaseous hydrogen charging. This work is partly supported by Grant-in-Aid for Scientific Research (C), No. 02650462, of The Ministry of Education, Science and Culture, Japan.
PY - 1995/7
Y1 - 1995/7
N2 - Dilute nickel alloys charged with hydrogen are known to exhibit an internal friction peak, which is attributed to the reorientation of hydrogen-solute atom pairs. In order to determine the geometrical configuration of the pair, we have studied anisotropy of the relaxation strength in dilute Ni-Ti-H alloy single crystals by low-frequency internal friction measurements. The orientation dependence of the peak height suggests that the defect symmetry is 〈111〉 trigonal. One of the possible configurations is the Ti-H pair in which hydrogen occupies the second neighbour octahedral sites around the substitutional solute atom. The peak has been found to be suppressed by an external magnetic field, indicating that magneto-elastic effects play an important role.
AB - Dilute nickel alloys charged with hydrogen are known to exhibit an internal friction peak, which is attributed to the reorientation of hydrogen-solute atom pairs. In order to determine the geometrical configuration of the pair, we have studied anisotropy of the relaxation strength in dilute Ni-Ti-H alloy single crystals by low-frequency internal friction measurements. The orientation dependence of the peak height suggests that the defect symmetry is 〈111〉 trigonal. One of the possible configurations is the Ti-H pair in which hydrogen occupies the second neighbour octahedral sites around the substitutional solute atom. The peak has been found to be suppressed by an external magnetic field, indicating that magneto-elastic effects play an important role.
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U2 - 10.1016/0956-7151(94)00454-P
DO - 10.1016/0956-7151(94)00454-P
M3 - Article
AN - SCOPUS:0029344684
SN - 0956-7151
VL - 43
SP - 2807
EP - 2814
JO - Acta Metallurgica et Materialia
JF - Acta Metallurgica et Materialia
IS - 7
ER -