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Effect of the pulsed electron irradiation on superplasticity properties of duraluminum
Abstract
Effect of pulsed irradiation by power beam of relativistic electrons on mesoscopic structure properties of Al-Cu-Mg alloy D16, has been studied. Phenomenological parameters of superplastic flow of initial and irradiated alloys were determined. It has been found that both initial and irradiated alloys have phenomenological features of superplasticity. Nevertheless, the value of elongation before fracture of irradiated specimens exceeds that for initial non-irradiated specimens by almost two times.
... As the material for the investigation, a number of matrix aluminum based alloys were used, which [14][15][16][17][18][19]. Their chemical compo sition is given in Table 1. ...
... The tensile tests of the samples (performed earlier, in [14][15][16][17][18][19]) were carried out in air in the regime of creep at a constant flow stress. Such conditions make it possible to obtain the physical parameters of the superplastic flow (strain rate strain rate sensitivity of the flow stress m, elongation at fracture δ) in "pure" form, which is very important for studying the physical nature of superplasticity. ...
... (3), we determined the thickness of the grain boundary liquid phase for the alloys studied in this work. The values of the quantities entering into (3), which are necessary for the calculation of the thickness of the grain boundary liquid phase, were taken from [14][15][16][17][18][19] (see Table 2). The thus obtained values of the thickness h 1 of the grain boundary liquid phase, which are also given in Table 2, are close to those given in [6][7][8][9][10][11][12][13]. ...
For a series of matrix aluminum alloys, an estimation of the thickness of the grain-boundary liquid phase under the optimum conditions of the manifestation of high-temperature superplasticity has been performed. It has been established that the contribution of grain-boundary sliding to the total deformation under these conditions is determining. It has been shown that the greater values of the thickness of the grain-boundary liquid phase correspond to greater values of the parameter m of the strain-rate sensitivity of the flow stress. The obtained dependences of the thickness of the grain-boundary liquid phase on m indicate that with increasing amount of the liquid phase the grain-boundary sliding progressively acquires features of viscous flow.
The samples of tungsten with a purity of 99.5 and 99.7% were irradiated with helium ion beams (EHe+ = 0.12 MeV). The total sputtering coefficients for the sample depth up to 60 Å from the surface of sample were obtained. It was found that on the surface of tungsten, the number of pits (the flecking effect) significantly exceeds the number of bubbles (the blistering effect). The damage profiles of the surface of tungsten as a result of irradiation with helium ions are calculated. The areas of maximal display of effects of damage are determined.
The characteristic manifestations of radiation-acoustic effects in metals and alloys under the irradiation of a high-current relativistic electron beam, leading to a melt surface with the partial removal of material from the surface, are studied in this paper. An increase in the acoustic emission in the samples when they are irradiated with a high-current electron beam is experimentally observed. It is shown that the primary mechanism for the generation of radiation-acoustic pulses in irradiated refractory metals is a stress-relieving mechanism. The amplitudes of the acoustic pulses after the second and subsequent electron pulses do not change, which indicates a correlation between the amplitude of the acoustic signal and the surface structure of the irradiated material.
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