多結晶金属の高温クリープ破断性質に及ぼす真空ふん囲気の影響に関する一考察 : 酸化膜と母材下部構造との関連に注目して

概要

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The tensile creep-rupture properties of commercial pure copper were studied in vacuum of 760 torr, 660 torr, 470 torr, 0.3 torr and 9 × 10^<-3> torr at 320℃. The following conclusions were obtained. (1) The creep-rupture times in both vacuums of 0.3 torr and of 9 x 10^<-3> torr were five and two times larger than that in air, respectively. Therefore, the existence of the effect of vacuum environment was confirmed. (2) With the decrease from 9 x 10^<-3>torr to 0.3 torr, the coherent oxide film Cu_2O was observed on the surface of crept specimen. Besides, the exfoliating film of CuO was observed preferentially with the decrease from 0.3 torr to 760 torr. (3) The creep test was interrupted at the time when the total strain reached 7 percent under σ=6.0 kg/mm^2 in both 9 x 10^<-3>torr and 0.3torr. It was considered that the remarkable incease of the steady state creep rate in vacuum of 9 x 10^<-3>torr resulted from the increase of dislocation density or the associated lattice strain on the basis of the measurement of micro strain by the X-ray diffraction technique.
社団法人日本材料学会の論文
1978-04-15