日本金属学会誌

J. Japan Inst. Metals, Vol. 14, No. 6 (1950),
pp. 8-11

Studies on the Changes of Various Properties of Metals and Alloys Due to Twisting (4th Report) Discontinuous Jump in the Creep Test

Uichi Hashimoto, Shôichi Matsuda and Nobuo Shiota


Abstract:

One of the authors reported in the second paper on the study of the mechanism of recrystallization in metallic crystals that there are discontinuous jumps in the process of deformation of crystals of pure iron at temperature of 650°C, pure nickel at 745°C, magnesium at 600°C and zinc at 300°C.
Then, the nature of such discontinuous jump in the creep process of single crystal of pure iron is studied under the following cases ;
(1) Influence of temperature to the magnitude and frequency of jumps.
(2) Influence of the existence of oxided surface layer.
(3) Polycrystalline state.
The results are as follows ;
(1) The discontinuous jump occurs above the recrystallization temperature.
(2) The frequency of jump decreases with time at constant temperature and the magnitude of a jump increases with the rise of temperature.
(3) The oxided surface layer prevents the presence of discontinuous jump.
(4) In the polycrystalline state, the discontinuous jump does not occur apparently.


(Received 1949/12/10)

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