抄録
Oxygen-containing-copper is embrittled when it is used in a hydrogen atmosphere.Even if it is not embrittled, it is inferior in twisting and flexing properties to oxygen-free-copper. Flex life test is standardized at present for the identification of oxygen-containing-copper and oxygen-free-copper which has various merits. In this paper, this present condition was reviewed, i.e., these coppers were identified by the change of electrical resistance, and these coppers' physical changes were also observed. In addition, special phenomenon shown by electrical resistance of hydrogen-embrittled-copper and its inner microstructure were considered.
Summary is asfollows:
1) By grasping the change of electrical resistance, process of hydrogen embrittlement could be understood with real time
2) Also, redox of hydrogen-embrittled-copper could be grasped by the change of electrical resistance.
3) Temperature coefficient of hyddrogen-embrittled-copper became larger than the theoretical value. As for oxidized copper after hydrogen embrittlement, temperature coefficient became larger than that of hydrogen-embrittled-copper. However, electrical resistance value of hydrogen-embrittled-copper at room temperature was the same as before embrittlement.
4) A physically interesting, unique phenomenon was found, i.e., volume resistivity in appearance became higher by the hydrogen embrittlement, but the electrical resistance of the line type copper in the length became lower than before embrittlement.
