Book ChapterDOI
Influence of Cyclic Stress on Substructure in Aluminum and Iron
A. Plumtree,E.S. Kayali +1 more
- pp 913-918
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In this paper, the same form of equation with a different constant was characteristic of each of the three wavy slip mode metals and the relationship appeared to be dependent upon the stacking fault energy of the particular material and independent of the type of deformation (ie. monotonic or cyclic).Abstract:
Polycrystalline aluminum and iron were cyclically deformed under strain control at room temperature. The corresponding dislocation substructures developed on saturation were examined by transmission electron microscopy. An inverse relationship was found between the saturation stress and dislocation cell size. Comparison of these results with those for aluminum, copper and iron obtained under both monotonic and cyclic conditions at various temperatures indicated that the same form of equation with a different constant was characteristic of each of the three wavy slip mode metals. The relationship appears to be dependent upon the stacking fault energy of the particular material and independent of the type of deformation (ie. monotonic or cyclic).read more
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Journal ArticleDOI
The Dislocation Cell IZE AND Dislocation Density in Copper Deformed at Temperatures between 25 and 700 Degrees C.
TL;DR: In this article, a dislocation cell structure was developed in polycrystalline OFHC copper by deforming tensile specimens 10 per cent, one at each of the following temperatures: 25, 250, 400, 500, 550, 600, 650 and 700°C.
Journal ArticleDOI
Flow Stress, Subgrain Size, and Subgrain Stability at Elevated Temperature
TL;DR: In this paper, the authors developed an equation to predict the creep rate as a function of sub-grain size, stress, diffusion coefficient, and elastic modulus, and found that the subgrain size is a unique function of the current modulus-compensated flow stress, but if fine subgrains can be introduced and stabilized, large increases in creep strength may result.
Journal ArticleDOI
Cyclic stress-strain response of F.C.C. metals and alloys—II Dislocation structures and mechanisms
C.E Feltner,C Laird +1 more
TL;DR: In this article, the effects of slip character, prior history, temperature and amplitude on the cyclic strain hardening and softening curves of copper and Cu-7.5% Al have been investigated by transmission electron microscopy.
Journal ArticleDOI
Substructure strengthening mechanisms
TL;DR: The mechanisms which give rise to substructural strength originate in the dislocation character of the substructure boundary, in the size of sources for continued slip which the boundaries permit, and in the number of the cells or subgrains as discussed by the authors.
Journal ArticleDOI
The effect of grain size and deformation sub-structure on mechanical properties of polycrystalline aluminum
Hiroshi Fujita,Teizo Tabata +1 more
TL;DR: In this paper, the effect of grain size on the apparent yield and flow stresses is investigated in polycrystalline aluminum of various grain sizes in the temperature range from 77 to 473°K.
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