Specific Features of Strengthening Phenomena in NaCl:Eu2+ Crystals |
| M. Suszyńska W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, pl. Katedralny 1, 50-950 Wrocław, Poland |
| Received: May 4, 1990; in revised form August 1, 1990 |
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| Mechanical strength of europium doped NaCl crystals was studied as a function of both the dopant concentration (c2+) and the kind of obstacles effective in hindering the motion of dislocations. It has been found that the yield strength (σ0) of solution treated samples is determined by Snoek reorientation of both isolated dipoles and linear dimers within the stress fields of moving dislocations. The deviation of the σ0 (c2+) plot from linearity is probably due to the presence of quadripoles cutted through the moving dislocations. Also for as- received specimens two precipitation strengthening mechanisms are postulated; these are the Kelly-Nicholson cutting and the Orowan looping, respectively. |
| DOI: 10.12693/APhysPolA.79.493 PACS numbers: 77.40.+i |