ISSN:
1573-9325
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. A comparative calculation based on dislocation dynamic properties is made of the initial portions or Fe+3.25% Si crystal deformation curves, both allowing for the crystal elastic deformation, using formula (1), and neglecting it, using formula (2). In contrast to the approximate formula (1), allowance for elasticity leads to a predicted lower upper yield point and yield “tooth.” 2. An analysis of the effects of the important physical parameters (temperature, deformation rate, original dislocation density) on the initial crystal plastic flow stages, shows that the lower yield point is practically independent of the original dislocation density for the given temperature range and for N0〈107 cm−2. 3. The calculated temperature dependence of the lower yield point agrees with that derived experimentally for Fe+3.25% Si single crystals from the temperature dependence of the “frictional” strains in the lattice of Fe+3.27% Si polycrystals, although no allowance was made in the calculation for the effects of temperature on the dislocation multiplication process. 4. The Hall-Petch formula was used to generalize the obtained results to polycrystals. A comparative analysis is made of the sensitivity of the lower yield point to the deformation rate, predicted by the calculation, and constructed on the basis of the many experimental results available in the literature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01543214
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