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titanium. Fine-grained microstructure could offer numerous dislocation multiplication locations during deformation. Once the applied stress is above the yielding strength, dislocations multiply rapidly.... As a result, the movement of dislocations is hardly blocked and the deformation could continue at a nearly constant applied stress. Consequently, the so-called yield plateau behavior presents......
, occur in the microstructure of superplastic deformed 6016 aluminum alloy. The dislocations gather near the grain boundaries to coordinate GBS deformation.The second-phase particles effectively prevent the growth of the recrystallized grains or plastic deformation grains and pin the moving dislocations during deformation.关键词:......
dissociation of [110]B19’ super lattice dislocations and were preserved after reverse transformation due to the lattice correspondence.Martensitic stabilization was attributed to dislocations induced......
that the stacking fault energy and the elastic interaction energy acting on the dissociated partial dislocations are equal. After the compress deformations with the strain of 0.2% at 298 K and 1273 K, and water quench to maintain the dislocation structures deformed at 1273 K, the dissociation distances between two partial dislocations were determined by weak beam transmission electron microscopy (WBTEM......
energies is based on the fact that the stacking fault energy and the elastic interaction energy acting on the dissociated partial dislocations are equal. After the compress deformations with the strain of 0.2% at 298 K and 1273 K, and water quench to maintain the dislocation structures deformed at 1273 K, the dissociation distances between two partial dislocations were determined by weak beam......
dislocations forward.The dislocations ultimately accumulated at a grain boundary,forming a parallel arrangement.Finally,the phenomenological equation of the residual stress evolution under electropulsing......
transmission electron microscopy(HRTEM).At the deformation degree by 15%,a high density of dislocations occurs in the deformed NiTi sample.At the deformation degree by 25%,the deformed NiTi sample exhibits the martensite morphology due to the pinning of dislocations at the grain boundaries.At the deformation degree by 50%,a small amount of nanocrystalline phase arises in the deformed NiTi......
distribution and dislocation free zone near thecrack tip in bulk Fe-3% Si single crystal duringdeformation in SEM.It has been found that anumber of dislocations were emitted from the cracktip during... specimen.The variation of dislocation densityas a function of the distance from the crack tip wasmeasured,which showed that the dislocations areinversely piled up in the plastic zone.The length ofDFZs increased......
,and this contributes to the martensitic stabilization effect.However,when deformation strain became larger,the density of dislocations increased correspondingly.Antiphase boundaries were also found.The degree of ordering was therefore decreased due to dislocations and antiphase boundaries.So disordering was another cause of martensitic stabilization effect.In the middle stage of deformation martensitic......
, and geometry of the serrations changed from sharp to rounded corner. Through analyzing the mechanism of the interactions between dislocations and solute atoms, it was identified that the precipitates did not only weaken the serrated flow due to the decrease in the concentration of solute atom, but also regulate the serration type by restraining the movement of dislocations during high temperature......
