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Strain Induced Grain Boundary Migration in High Purity Aluminum

Paul A. Beck、P. R. Sperry1950-02-01OpenAlex

A method has been developed for the study of grain boundary migration in high purity aluminum, which allows positive determination of the direction of grain boundary movements. By means of this method it was confirmed that the migration of grain boundaries resulting from surface energy takes place in the direction tow…

Aluminum Alloy Microstructure PropertiesMetallurgy and Material FormingMicrostructure and mechanical properties

Determination of Crystallite Size with the X-Ray Spectrometer

Leroy Alexander、Harold P. Klug1950-02-01OpenAlex

The accuracy of the Scherrer crystallite size equation is limited in part by the uncertainty in β, the experimentally deduced pure diffraction broadening. Currently used procedures for estimating β from the observed breadth of a Debye-Scherrer line are not, in general, applicable to the x-ray spectrometer. By making u…

Advanced X-ray Imaging TechniquesEnzyme Structure and FunctionX-ray Diffraction in Crystallography

Kinetics of Heterogeneous Nucleation

David Turnbull1950-02-01OpenAlex

Consider a phase transition α⇄β. Stable β-embryos can be retained in the temperature range of α-stability in cavities of suitable extraneous solids present in the system. Retained β-embryos may nucleate the α→β-transformation in the range of β-stability. Using these concepts a theory for the effect of thermal history…

nanoparticles nucleation surface interactionsChemical Thermodynamics and Molecular StructureCrystallization and Solubility Studies

The Theory of the Change in the Conductivity of Metals Produced by Cold Work

J.K. MacKenzie、E. H. Sondheimer1950-01-15Physical Review

An attempt is made to calculate the increase in the residual electrical resistance of cold-worked metals by attributing the effect to an elastic distortion similar to that produced by the presence of edge type dislocations. It is shown that, in single crystals, the direction of the dislocation axes, the slip direction…

Non-Destructive Testing TechniquesAluminum Alloys Composites PropertiesMicrostructure and mechanical properties