Study of excitation of low energy for the low-temperature internal friction in the metallic glass Co sub 35 Y sub 65
- Department of Physics, Wuhan University, Wuhan, Hubei 430072, People's Republic of China (CN)
- Department of Physics, Peking University, Beijing 100871, People's Republic of China (CN)
Based on the unified theory of low-frequency fluctuation, dissipation, and relaxation processes, we studied the broad and asymmetric low-temperature internal friction peak of the metallic glass Co{sub 35}Y{sub 65}. This theory, which differs from that of distributed relaxation times, involves only a single relaxation time {tau}{sub {ital P}}. By this theory, the calculated infrared-divergence exponent {ital n}=0.62, characteristic relaxation time {tau}{sub {infinity}}=2{times}10{sup {minus}14} s, actual activation energy {ital E}{sub {ital A}}=0.2 eV, and apparent activation energy {ital E}{sup *}{sub {ital A}} =0.52 eV. They are in agreement with available experimental results ({tau}{sub {infinity}}=2.2{times}10{sup {minus}14} s, {ital E}{sub {ital A}}=0.25 eV, and {ital E}{sup *}{sub {ital A}} =0.56 eV). Since the composition is very close to that of the intermetallics CoY{sub 2}, the chemical short range order exists partly in the metallic glass Co{sub 35}Y{sub 65}. We notice from the behavior of this peak that it is not caused by the motion of gas atoms dissolved in the sample. From the much smaller radius of a Co atom compared with that of Y, we suggest this peak results from migration of Co atoms to neighboring vacancy with infrared divergence.
- OSTI ID:
- 7123612
- Journal Information:
- Journal of Applied Physics; (USA), Vol. 67:9; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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