Internal Friction Peak in Quenched Gold
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概要
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Gold specimens quenched from 1000℃ showed a relaxation peak at about -50℃ (at 1 cps) possibly due to the stress induced reorientation of divacancies. A large number of thermal vacancies are frozen in metal by quenching from a high temperature. The work by Bauerle and Koehler on gold^<1)> has shown that quenching from temperatures above 900℃ could produce a fairly large concentration of divacancies and that the activation energy of their migration is about O.6eV. The calculation by Kimura et al.^<2)>, for example, gives the concentrations of divacancies of 1x10^<-4> and 5×10^<-7> in the specimen quenched from 1000℃ and 700℃, respectively. The stress induced reorientation of such divacancies should give rise to an internal friction peak, if their relaxation strength is large enough. This was suggested by one of the authors (R.R.H.)^<3)>. Several polycrystalline gold wires (99,999% pure) of about 0.5 mm in diameter were quenched from 1000℃ and 740℃ into water and the intenal friction was measured as a function of temperature by the inverted torsion pendulum^<4)>. The maximum shear strain amplitude was about 11^<-5>.
- 社団法人日本物理学会の論文
- 1964-02-05
著者
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Hasiguti Ryukiti
Department Of Mechanical Engineering Faculty Of Engineering The Science University Of Tokyo
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Okuda Shigeo
The Institute Of Physical Nd Chemical Research
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