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On the influence of repetitive corrugation and straightening on the microstructure and mechanical properties of AA 8090 Al-Li alloy

Rino J. J., Prabu B. S., Padmanabhan K. A.

Archives of Civil and Mechanical Engineering

2018

Vol. 18, no. 1

280--290

This paper reports on the improvements in the mechanical properties of AA8090 Al-Li alloy subjected to repetitive corrugation and straightening (RCS). AA 8090 Al-Li alloy sheets were processed using different corrugation profiles (semi-circular, flat-groove and V-groove) at 300 °C, with a pressing velocity of 2.5 mm/s. This study shows that a V-grooved die favors grain refinement, e.g. a reduction in the average grain size from 65 μm to 12 μm after eight passes is achieved. Grain size distribution and misorientation between grain boundaries were studied using EBSD and TEM. The microstructures also appear to have more high-angle grain boundaries in the case of the specimen processed using the V-grooved die. The tensile strength increases with the number of passes, but drops when surface cracks appear after the 16th pass for a semi-circular die, the 12th pass for a flat grooved die and the 10th pass for a V-grooved die. In contrast, the hardness continues to increase with increasing number of passes. Ultra-fine-/nano-grains were present after the eighth pass in a sheet that was processed using a V-grooved die.

Changes in Structure of CuCr0.6 Alloy After Repetitive Corrugation Process

Jung T., Kwaśny W., Rdzawski Z., Głuchowski W., Matus K., Pawlyta M., Szindler M.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 4

2441--2448

This paper presents the study of repetitive corrugation process influence on the strengthening of annealed alloy. Based on the results of mechanical properties of deformed sample, it has been found that the microhardness, ultimate tensile strength, yield strength and apparent elastic limit are significantly increased in relation to annealed sample. Examination on transmission electron microscopy confirmed the effect of intensive plastic deformation on structure fragmentation in the nanometric scale. This work confirmed the possibility of using the repetitive corrugation process to increase mechanical properties of CuCr0.6 alloy.