KCl単結晶の室温以上での鋼球押し込みによる変形

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The microscopic deformation mechanism of KCl single crystals under the indentation with a steel ball was studied under the load range of 0.5 N〜5.0 N in the temperature range 20℃〜300℃. Indentations were made on the{100}plane, and using the etch pit detecting technique the dislocation structures were investigated on the indented surface and its cross section. The results obtained are as follows: (1)The dislocation structure formed on a{100}plane at room temperature consists of a high-dislocation-density range and a wing-shaped area of comparatively low density extending along the<110>and<100>directions. (2)Dislocation activities on the{110}_<90> and{110}_<45> planes are more active under the testing temperature at 100℃ and 200℃ than at room temperature. At these testing temperatures, the deformation is mainly caused by the slip on the{110}_<90> plane under comparatively high loads, while the deformation under the lower loads is caused in the pattern than the slips on the{110}_<90> and{110}_<45> planes have almost equal effect on the formation of the dislocation structure. (3)At 300℃, the slip activities on the slip system besides the{110}<110>are observed. Dislocation structures with a pattern of circle in the neighborhood of indent, and with a wing-shaped pattern along the<110>direction in the outer range, are observed. (4)On the cross section, dislocation activities on the{110}_<45> plane are detected at all testing temperatures. It is confirmed that the secondary slip activities occur on the{100}plane at 300℃.
社団法人日本材料学会の論文
1995-09-15

KCl単結晶の室温以上での鋼球押し込みによる変形

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