Defects in Body Centred Cubic Metals and Alloys.
Final technical rept. 1 Oct 66-30 Sep 68,
OXFORD UNIV (UNITED KINGDOM) DEPT OF METALLURGY
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The dislocation arrangements in deformed single crystals of high purity niobium, and some of its alloys with molybdenum and rhenium, have been studied using transmission electron microscopy. In niobium the arrangements corresponding to various points on the stress-strain curve have been ascertained in detail. A general theory is developed to account for the mobility of a dislocation which is sessile in its low-energy form. A specific core model is used to derive an expression for the mobility of screw dislocations in body centred cubic metals, and the application of the theory to the temperature and orientation dependence of the yield stress and slip geometry, and to the stress dependence of the activation energy and volume is discussed. Author
- Metallurgy and Metallography
- Solid State Physics