TY - JOUR
T1 - Evaluation of elastic strain energy associated with the formation of hydride precipitates in LaNi5
AU - Tanaka, K.
AU - Okazaki, S.
AU - Ichitsubo, T.
AU - Yamamoto, T.
AU - Inui, H.
AU - Yamaguchi, M.
AU - Koiwa, M.
N1 - Funding Information:
This work was supported by Grant-in Aid for Scientific Research on Priority Areas (A) of “New Protium Function’’ and in part by Grant-in-Aid for Scientific Research (No. 08555162) from the Ministry of Education, Science, Sports and Culture, Japan. One of the authors (T.Y.) greatly appreciates the support from Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists.
PY - 2000
Y1 - 2000
N2 - The elastic energy associated with coherent precipitation of hydrides with various shapes in LaNi5 has been calculated by the Eshelby method with the single-crystal elastic constants experimentally determined by a rectangular parallelepiped resonance method. The calculated elastic energy amounts to about 70% of the change in chemical energy that occurs upon hydride formation. This implies the difficulty for coherent hydrides to nucleate in the perfect lattice of LaNi5. This is in contrast to the case of titanium or zirconium, in which the associated elastic energies are only about 15% of the chemical energy change. Hydride precipitation in LaNi5 is thus suggested to occur preferentially at free surfaces and lattice defects such as dislocations and grain boundaries.
AB - The elastic energy associated with coherent precipitation of hydrides with various shapes in LaNi5 has been calculated by the Eshelby method with the single-crystal elastic constants experimentally determined by a rectangular parallelepiped resonance method. The calculated elastic energy amounts to about 70% of the change in chemical energy that occurs upon hydride formation. This implies the difficulty for coherent hydrides to nucleate in the perfect lattice of LaNi5. This is in contrast to the case of titanium or zirconium, in which the associated elastic energies are only about 15% of the chemical energy change. Hydride precipitation in LaNi5 is thus suggested to occur preferentially at free surfaces and lattice defects such as dislocations and grain boundaries.
KW - A. Intermetallics, micellaneous
KW - B. Elastic properties
KW - C. Crystal growth
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U2 - 10.1016/s0966-9795(99)00154-5
DO - 10.1016/s0966-9795(99)00154-5
M3 - Conference article
AN - SCOPUS:0000690230
VL - 8
SP - 613
EP - 618
JO - Intermetallics
JF - Intermetallics
SN - 0966-9795
IS - 5-6
T2 - 5th IUMRS International Conference on Advanced Materials - Symposium D: Intermetallic Compounds and Bulk Metallic Glasses
Y2 - 13 June 1999 through 18 June 1999
ER -