-
Article
Continuous plastic cracks in ordered alloys
A discrete dislocation analysis of the continuous plastic crack is carried out for ordered alloys. The crack is assumed to nucleate and reach a size where it will emit a set of lattice dislocations in order to...
-
Article
Differential geometry of phase transformations
The foundations have been laid with respect to a generalized theory of phase transformations in solids. In particular, the methods of differential geometry have been employed and such important tensor quantiti...
-
Article
Dislocation model of the interaction between a tensile crack and a hole
The representation of a crack by discrete dislocations and that of a hole by surface dislocations is used to study the interaction between a tensile crack and a hole. It is shown that for a given size and shap...
-
Article
The differential geometry of disclinations: Twist disclinations
The techniques of differential geometry have been applied to the study of both perfect and imperfect twist disclinations in simple cubic crystals. It is found that these desclinations act as terminal points fo...
-
Article
Relationship between atomic ordering and fracture in Fe-Al alloys
The fracture surfaces of slowly cooled Fe-Al alloys containing up to 28 at. % Al were examined using scanning electron microscopy techniques. It was found that the fracture modes changed from void coalescence ...
-
Article
The relationship between cracks, holes and surface dislocations
It has been shown that surface cracks as well as holes can be represented in terms of surface dislocations. These surface dislocations exist in order to insure that no tractions act on any free surface within ...
-
Article
Effect of strain, temperature, and atomic order on slip deformation in FeCo
A detailed investigation of the low temperature deformation behavior of ordered and disordered FeCo was carried out in order to determine the effect of strain and atomic ordering on the rate controlling proces...
-
Article
Plastic deformation in Fe-Si alloys
A detailed study has been made of the compressive stress-strain behavior of polycrystal-line Fe-Si alloys containing from 0 to 25 at. pct Si. It is shown that the alloys containing less than 10 at. pct Si poss...
-
Article
Study of Portland cement fracture surfaces by scanning electron microscopy techniques
An extensive scanning electron microscopy study was carried out with respect to the fracture surfaces of Portland cement hydrated for various times. It is shown that the two major products of hydration are cal...
-
Article
Deformation of internal boundaries
A geometrical analysis of the deformation of internal boundaries is presented using the slip systems as reference co-ordinate axes to describe the orientation of the two phases adjacent to the boundary. The pr...
-
Article
Direct observation of grain-boundary dislocations in the FeCo alloy
A unified dislocation theory of grain boundaries proposed earlier for simple cubic crystals has been extended to include the case of ordered and disordered body-centred-cubic structures. Pure symmetric and asy...
-
Article
Direct observation of grain-boundary dislocations in the FeCo alloy
An extensive transmission electron microscopy study has been made of the structure of high and low angle grain boundaries in both ordered and disordered FeCo alloys which were electrochemically thinned from th...
-
Chapter and Conference Paper
The Effect of Atomic Order on the Mechanical Properties of Alloys with Emphasis on FeCo
An extensive review has been carried out with respect to the effects of atomic order on the mechanical behavior of alloys. Emphasis has been placed on the simplest of superlattice types, namely the CsCl struct...
-
Article
Study of polyethylene spherulites using scanning electron microscopy
A detailed scanning electron microscopy study has been made of spherulites in meltcrystallized polyethylene. In particular, unetched, ion etched, nitric acid etched and plastically deformed polyethylene sample...
-
Article
Dislocation behaviour in ordered alloys in the presence of frictional forces
A detailed numerical analysis has been made of the passing of superlattice dislocations in the presence of frictional forces and the results compared with those for ordinary dislocations. In particular, it was...
-
Article
Dislocation behaviour in ordered alloys in the presence of frictional forces
A detailed numerical analysis has been made of the passing of superlattice dislocations in the presence of frictional forces and the results compared with those for ordinary dislocations. In particular, it was...
-
Article
Scanning electron microscopy observations of polyethylene spherulites
-
Article
Work hardening in the Cu3Au superlattice
Single crystals of a fully-ordered Cu3Au alloy were deformed in compression at room temperature on a single glide system to a very high degree of plastic strain in Stage II. Transmission electron microscopy obser...
-
Article
Twist boundaries in ordered alloys
A detailed analysis has been made of the equilibrium configuration of some of the simpler types of twist boundaries anticipated in ordered alloys. Similar to the case of tilt boundaries, it is found that the e...
-
Article
Dislocation behavior at tilt boundaries of infinite extent
A detailed theoretical analysis has been made of the stress fields which arise from the motion of glide dislocations across a symmetric tilt boundary. These stress fields are long range and result from the for...
